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10 

 

 

 

Review 

Urban heat island: a primary guide for urban 

designers 
Mohammadhassan Salmanian1*, Akram Bayat2 

1Faculty of Design and Architecture, Universiti Putra Malaysia,43400 Serdang, Malaysia 
2Faculty of Architecture and Urbanism, Iran University of Science and Technology, Iran 

A R T I C L E   I N F O 
 

Article history: 
Received 16 December 2022  
Received in revised form 
23 January 2023 
Accepted 01 February 2023 
 
Keywords: 
Urban design, Urban heat islands,  
Thermal comfort 
 
*Corresponding author 
Email address:  
gs57464@student.upm.edu.my  

 
DOI: 10.55670/fpll.fuen.2.4.2 

A B S T R A C T 
 

Today, the most severe issue in metropolitan areas is rising surface 
temperature due to poor urban design. Given the significance of the urban 
thermal island, numerous studies have been done to discover the mechanisms 
influencing its growth and decline. Thermal comfort is relatively simpler to 
accomplish inside a building, whereas it is considerably more challenging to 
achieve in open spaces, and hence far less work has been done on it. The 
construction of urban thermal islands has emerged as one of the most serious 
concerns of our day, and it has captured the scientific community's attention. 
Attention to this subject has expanded dramatically in scholarly articles and 
research, particularly in the recent decade. Because of the subject's relevance, 
this study aims to undertake a systematic evaluation and thematic analysis of 
papers and scientific research in this field. According to studies, the urban heat 
island is influenced by climatic elements and city-building factors. All climate 
influences are sunlight, wind speed and direction, cloud cover, soil and air 
humidity, precipitation, latitude, seasonal change, topography, and proximity to 
rivers and the sea. Although these elements are almost uncontrolled in existing 
cities, they are essential in finding new cities or deciding the direction of city 
development. The second element category is controllable and primarily 
connected to city planning and building. Recognizing the significance of these 
factors can demonstrate the relevance and value of urban planning and design 
in lowering urban heat islands. We review the nature and aspects of this 
phenomenon in this article by exploring the theoretical foundations of this 
topic. 

 
1. Introduction  

For many, the supply of basics like fresh water, food 

security, and electricity is anticipated to be impacted by a 

climate warming system. Concurrently, efforts to mitigate and 

adapt to climate change will equally inform and influence the 

global development agenda. It is crucial to understand how 

climate change and sustainable development are related. The 

least equipped to withstand the projected shocks to their 

social, economic, and environmental systems will be the most 

negatively impacted by these shocks. These poor and 

emerging countries-primarily the least developed- will be the 

majority [1]. In comparison, this increase is outweighed by an 

increase in the number of families, implying that the overall 

number of people per family drops. As a result, our cities will 

continue to grow, putting further strain on the existing urban 

area. Current urbanization patterns significantly impact how 

we plan, build, and live in our cities. The transition from rural 

to urban settings includes a variety of human-caused 

consequences, such as a loss of biodiversity or a lack of water 

supplies [2]. It also affects the shape and energy budgets of 

the urban environment, leading to higher temperatures than 

in the undeveloped environment [3-5]. The Urban Heat Island 

(UHI) phenomenon is centered on this. Luke Howard, a 

British meteorologist, was the first to study the phenomenon; 

in 1818, he found a sizable rise in the center of London [6]. 

For a long time, neither science nor politics supported the 

UHI. This changed in 1971 when the Club of Rome issued its 

Limits to Development report. The study was the first to 

explore the consequences of population development on UHI, 

making it one of the most visible repercussions of human-

caused environmental change. In general, the study sparked a 

fundamental debate regarding the reality of climate change 

and a search for factual data to demonstrate human 

proficiency in it. In the case of UHI, the formation and 

consequences were examined and analyzed until it became 

clear that an increasing proportion of our population was 

subjected to urban atmospheric conditions. The dilemma of 

climate change and UHI has seen substantial adjustments in 

 

 

Future Energy 

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November 2023| Volume 02 | Issue 04 | Pages 10-23 

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M. Salmanian and A. Bayat /Future Energy                                                                        November 2023| Volume 02 | Issue 04| Pages 10-23 

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the recent two decades as politicians and cultures have begun 

to pay greater attention to the issue. The worldwide debate 

was dominated by effect evaluation and how to deal with 

them, leading to significant new knowledge on preventative 

and adaptation activities. However, because politicians and 

society have called for a comprehensive solution to the effects 

of climate change and UHI, the efforts taken thus far have not 

been practicable. The emphasis shifted from natural science 

to a multidisciplinary approach, emphasizing information 

development and collaboration among scientists, planners, 

and decision-makers. To develop sustainable locations, urban 

planners and designers must handle the repercussions of this 

argument, such as higher knowledge volumes, demand for 

diverse, sustainable settings, and improved political and 

social wealth [6]. However, in the recent debate, other 

consequences, such as increasing sea levels or global 

warming, have overshadowed the UHI hypothesis. This is not 

surprising given the calamities in Bangladesh and New 

Orleans, but the UHI should not be neglected. For example, 

recent heat waves in Europe have sparked a significant 

national discussion, with thousands of direct causes of death 

and sickness. Furthermore, there are significant effects on 

municipal water and energy supplies. Rising energy demand 

strains city climates and water supplies [7]. Thus, the UHI is 

one of several climate change-related outcomes that put 

space planners under pressure; planners must use vast 

amounts of new knowledge to create well-planned and secure 

areas. Environmental experiments have created several 

theories regarding limiting adverse impacts in the case of the 

science-based UHI. The main thing today is to understand 

how to apply all of the current knowledge and how to deal 

with the influence of politics and culture in creating well-

planned and thriving areas, and therefore how to implement 

the steps successfully. More research must be conducted to 

clarify how to build a clear UHI strategy for a region and apply 

all broad initiatives in local planning practice. In this 

approach, the adverse effects of UHI will be reduced, assuring 

long-term growth in our cities. 

2. Urban heat island: concept 

There are several points of view when it comes to 

challenging UHIs. Few people will immediately begin 

dreaming about global warming, while others will speculate 

about the Pacific Ocean's tiny islands, but the primary number 

has never been heard. The position of UHI is always relatively 

limited or nonexistent in today's discourse on climate change, 

environmental development, and eco-engineering. This lack 

of exposure can be interpreted in various ways, all of which 

must be addressed in this study. Still, one of them is the 

phenomenon's vague and dubious existence. This section will 

explain the exact phenomenon, beginning with the 

fundamentals of UHI [8]. There are substantial differences in 

the notion of UHI and its outcomes. The influence of urban 

surfaces, wind patterns, and global warming is widely 

debated. However, there is a consistent interpretation of the 

underlying concept of UHI, which can be defined as the 

variation in temperature between urban and rural areas 

(Figure 1) [2]. In literature,  UHI is an improvement in urban 

temperature. The question here is, what is the exact growth 

and how it is made. Measurements and forecasts vary 

worldwide due to current variations in geographic climate 

conditions [9]. An examination of a wide range of 

environmental and planning literature indicates the issue of 

the UHI's thermal effect notion. As a result, it is critical to 

research on a local scale to explain the case of the urban 

environment, considering the particular climatological and 

morphological circumstances. To better understand the 

specific causes of UHI and its relevance to urban planning, we 

shall first review the theoretical foundation of this section. 

Figure 1. The definition of an urban heat island [5] 

2.1 Theoretical basis 

For urban heat islands, the lowest atmospheric level 

affects state and local climates. At the same time, other 

experts believe that UHI's effects on global temperatures have 

yet to be fully realized. The UHI-world climate change 

relationship will be discussed further in this section. 

2.1.1 Urban climatology 

While people have historically adapted to their 

surroundings, climate change poses new and unprecedented 

hazards to lives and livelihoods. Given increasing 

uncertainties and ambiguity about climate adaptation, 

interest has grown in the previous two decades. Even though 

it was initially used in the 1990s, the IPCC definition gained 

traction. The fourth of these evaluations is "the most recent 

change in natural or human systems in response to current or 

expected climatic stimuli or their repercussions, which 

mitigates harm or capitalizes on positive opportunities" [10]. 

Additionally, the United Nations Framework Convention on 

Climate Change (UNFCCC) Conference of the Parties (COP) 

meetings have added to this growing knowledge. COP 21 

highlighted the importance of setting a global goal for 

adaptation "develop adaptation capability, enhance 

resistance, and reduce climate change vulnerability" [11]. In 

addition to natural disasters, metropolitan areas are at risk 

from unexpected climatic hazards (e.g., urban heat islands, 

impervious surfaces exacerbating flooding, coastal 

development threatened by sea-level rise, etc.) [12]. 

Additionally, most people on Earth live in metropolitan 

regions [13]. Many assets are at risk from climate change 

because they are hubs of the global economy [14]. 



M. Salmanian and A. Bayat /Future Energy                                                                        November 2023| Volume 02 | Issue 04| Pages 10-23 

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Additionally, urban locations provide distinct options for 

adaptability. First, judgments for adaptation frequently call 

for locally specialized activities, which are best suited by 

local-level decision-making [15]. Secondly, urban settings 

foster inventiveness and efficient energy usage. Numerous 

charity foundations, in particular, encourage local adaptation 

by funding initiatives like the Kresge Foundation's 

examination of urban populations' climatic resiliency and 

susceptibility to urban adaptation. The initiative will assist in 

meeting urgent demands for climate action and guide 

decisions regarding housing, land use, water supply 

management, transportation, and other issues relating to 

policies and finances, including motivating local communities 

to act and advising them on what to do to improve their health 

and resilience to climate change. Fourth, given the 

significance of cities in addressing climate change, cities have 

lately become more competitive, as seen by growing interest 

in C40, 100 Resilient Cities, etc. [16]. This results from 

numerous cities' adaptation efforts and expanding research 

on urban adaptation [17]. Additionally, the Adaptation 

Clearinghouse of the Georgetown Climate Center [18] tracks 

some state-level adaptation proposals, and researchers have 

examined the data. The demands and progress of urban 

adaptation are examined in recent study literature [19]. 

Additionally, a sizable examination of national adaptability 

has been conducted, which includes monitoring national risk, 

addressing climate change threats, and enhancing overall 

national adaptability [20]. 

2.1.2 Urban climate  

The urban climate closely interacts with energy 

demand, outdoor comfort, and energy systems. The geometric 

complexity, heterogeneity, and link of cities to meteorological 

events confound urban microclimate modeling [21]. The city 

and climates are two artificial and natural systems that are 

inextricably linked in constructing various city places such as 

buildings, green rooms, urban networks, etc. Aside from 

practical, visual, and aesthetic aspects, it is also vital to 

consider the city's climate and climatic design standards. The 

four primary climatic factors in the architectural structure of 

urban areas are "Solar Radiation," "Wind Flow," "Relative 

Humidity," and "Temperature." Controlling the two indicators 

of sun radiation and wind flow allows for precise relative 

temperature and humidity control. As a result, the first stage 

in climatic design is to understand the influence of changes in 

these climatic factors on environmental comfort. 

2.1.2.1 Solar radiation 

The sun is the source of the energy that determines 

our climate. Radiation from the sun reaches Earth as 

electromagnetic energy. All things emit electromagnetic 

radiation, which may be thought of as waves with peak-to-

peak lengths that vary with the surface temperature of the 

item. The electromagnetic radiation from the sun that 

penetrates Earth's atmosphere has a peak within the visible 

human range of wavelengths, around 400-700 nanometers, 

and the temperature at the sun's surface is approximately 

6000°K, four (nm). We refer to the whole range of the solar 

spectrum, which extends from 280 nanometers (nm) to 

around 3000 nm (or 0.28 micrometers, abbreviated m, to 3 

m), as short waves or solar radiation [22]. Understanding 

solar efficiency is crucial for urban planners and architects 

when designing urban structures. As the most logical 

approach to gathering solar energy, it is crucial to incorporate 

solar electricity into buildings with rooftops and façades. It 

has a significant impact on architecture. Mature solar 

technologies are more likely to produce preferable solutions 

during the early design phase. Early integration can be eased 

when architects know where the most significant energy may 

be produced. Real estate developers may also find solar 

power a crucial asset because they can see the energy 

produced in the envelope [23]. Furthermore, energy 

conservation and emission reduction have been elevated to a 

crucial strategic position in the People's Republic of China's 

13th Five-Year Plan on Energy Strategy. Solar energy is 

excellent for sustainable energy with no restrictions and can 

be utilized everywhere. Solar energy usage offers enormous 

development potential and is reliable and effective. Solar 

energy generation and use in urban areas will limit the 

excessive use of traditional fossil fuels, prevent the 

deterioration of urban ecosystems, and ensure that urban 

areas have a healthy natural ecosystem [24]. The first area is 

where emergencies with energy usage may be addressed and 

finally resolved in the city. The lack of solar potential included 

in the conventional urban planning process, which is a 

deciding element to attain smart energy cities made up of zero 

energy structures, gave rise to the discussion of solar urban 

planning. The modern city that Le Corbusier envisioned was 

not realized. However, considering urban planning as the first 

sector to apply solar design logic was a creative idea. Energy 

experts and urban planners have long considered solar 

radiation and associated difficulties as active elements in 

urban development. The Urban Heat Islands (UHI) and 

Outdoor Thermal Comfort have been recognized as 

prosperous urban design areas among the numerous solar 

energy instances researched. UHI will quickly discuss these 

two areas of urban design below [25]. 

2.1.2.2 Urban heat island 

In the 1810s, Luke Howards made the first reference 

to urban heat. In contrast to the city's rural surroundings, he 

saw "an artificial excess of heat" in London. Mitchell (1953) 

began his studies in the United States in the 1950s. Recently, 

there has been much global study on the urban heat island 

effect [26]. In metropolitan settings, a microclimatic 

phenomenon is referred to as a "Heat Island." It entails an 

appropriate air temperature rise in metropolitan regions, 

which is often warmer than the nearby rural neighborhoods 

(Figure 2). When breezes are light, the temperature 

differential is often more suitable at night than during the day. 

In terms of the seasons, the urban heat island effect primarily 

affects those who live in cities in the summer and winter. 

Addressing the UHI hazard to human health in urban areas is 

essential. The intensely scorching summer temperatures 

substantially impact the quality of life in cities. They may be 

summed up as a severe decline in public health, a warmer 

biosphere, and increased energy use [27]. The UHI 

phenomenon has an impact on urban areas for several 

reasons. The primary factor is the physical properties of the 

materials that make up urban surfaces, which absorb solar 

energy rather than reflect it. Longwave Radiation is emitted 

depending on the surface's excess warmth, especially at night. 

A constant energy balance is also maintained by the tiny 



M. Salmanian and A. Bayat /Future Energy                                                                        November 2023| Volume 02 | Issue 04| Pages 10-23 

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amounts of natural surfaces often present in metropolitan 

settings. The waste heat produced by energy usage is another 

aspect of the temperature rise [27].  

 

Figure 2. Diagram of an urban heat island phenomenon [27] 

 

The negative consequences of climate change are made 

worse by the rising urban development rate. Specifically, 

energy demand has increased by 14% over the past ten years 

because of its fast urbanization. By 2030, at least 61% of the 

world's population will live in cities. Nearly four billion 

people, or 80% of the world's urban population, will live in 

the cities of industrialized nations, accounting for 95% of the 

population growth. However, this development may present 

a chance for ecologically responsible urban renewal or 

rebuilding [28]. The following are some significant factors 

that have fueled the expansion of UHI in metropolitan areas: 

Surface: The critical element impacting UHI is the soil surface 

content. Solar power is collected in the city and emitted 

during the day and night. Therefore the disparity between the 

thermal entry of urban areas and their rural counterparts 

would also increase the heat island's size. Urban heat islands 

would be constrained by the increased emissivity from the 

sky and wind [29], demonstrating the most significant 

differences between urban and rural temperatures [30]. 

Urban surfaces use materials that absorb short-wave 

radiation to boost their thermal capacity, which increases 

their ability to absorb solar energy [31].  

Lack of plants: There is a wealth of data on how plants and 

greenery affect air temperature. According to reports, large 

parks are typically 1-2°C colder than populated areas, 

although this temperature difference can reach up to 5°C [29]. 

Lack of vegetation in urban areas reduces the 

evapotranspiration, shade, and cooling benefits of plants that 

promote UHI and warm the city [30]. 

High buildings: High-rise building situations need special 

consideration. Because continuous slab buildings have varied 

surfaces that reflect and absorb sunlight, keeping urban areas 

warmer, they can obstruct fresh air and wind flow [28]. 

Human Activity: Environment-harming human actions 

include using air conditioning, driving, and building factories 

[32]. Both directly and indirectly, heat is affecting the climate. 

These processes pollute the environment, affect the input and 

exhaust radiation, and release heat and humidity [33]. This 

increased temperature could lead to detrimental health and 

environmental and economic consequences on the local 

environment [34]. Experts claim that excess heat exposure in 

the United States kills more people every year than deaths 

from other combined cases [28]. These high-heat occurrences 

disproportionately harm the city's young, old, and sick 

residents, and it appears that there is insufficient economic 

assistance to mitigate the adverse health effects of excessive 

heat [35]. The cost of living would go up if UHI were improved 

since it would require more energy for cooling and 

refrigeration in urban areas. Additionally, it is predicted that 

energy consumption will rise by 2 to 4% for every one-degree 

Celsius increase in the intensity of the UHI [30]. Compared to 

this, due to fast urbanization, energy demand has increased 

by 14% over the past ten years [36]. Because energy is 

essential to human life, this will soon become a worldwide 

concern due to the risk that energy may become scarce [37]. 

In a hot and dry climate, UHI is more likely to result in high 

temperatures and decreased air moisture, decreasing comfort 

and heat stress in metropolitan areas (Figure 3) [29].  

 

Figure 3. The consequence of adaptation possibility: Thermal 

stress is much less likely to occur as there are more chances 

for environmental management [40]. 

 

All of these conditions are made worse by the UHI, 

including heat and cold stress, excessive sun exposure, bug 

infestations, water, and air pollution, waste, noise, adverse 

effects on energy consumption, and fires. Heat exhaustion, 

heat syncope, heart attacks, and heat cramps are symptoms of 

UHI, which also refer to heat and heart failure [38]. The 

possible effects of UHI include the unfavorable social and 

economic effects of hot weather. Only necessary 

confinements will be made to the unpleasant environment, 

i.e., by limiting outside social activities and going shopping 

and working [39]. An essential aspect of this is the expanding 

usage of air conditioning, which drives up energy costs and 

consumption, leading to frequent power outages and air 

pollution [30]. Local heat waves may impact the welfare and 

health of residents in addition to temperature factors. Over 

800 people perished in Chicago's 1995 heat wave [41]. In 

2003, heat-related diseases in Paris led to 15,000 fatalities 

across Europe [42]. Air pollution will rise as a result of urban 

heat islands. According to studies by Sarrat et al. [43], urban 

heat islands in Paris affect the levels of ozone and nitrogen 

oxide (NOx) . The energy needed for cooling also rises due to 

the urban heat islands. In turn, additional heat is released into 

the city, aggravating the urban heat island effect [44]. The 

unexpected effects of human activity on the climate, or 

accidental climate change, are most evident in urban settings. 

Cities influence climate and atmospheric composition 

changes at local, regional, and even planetary dimensions. As 



M. Salmanian and A. Bayat /Future Energy                                                                        November 2023| Volume 02 | Issue 04| Pages 10-23 

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cities struggle to deal with catastrophic occurrences like 

storms, floods, and droughts, the atmosphere also influences 

their infrastructure, citizens' health, and public safety. In 

order to intelligently limit undesirable effects and increase 

advantageous ones, proper knowledge, description, and 

modeling of these interactions are required. In the end, this 

offers the scientific information required to plan, oversee, and 

run communities that are healthier, more sustainable, and 

more resilient [45]. By examining the historical and 

environmental effects of global urbanization, this part 

establishes the framework for the urban climate. 

Outdoor thermal comfort: There are several reasons to 

improve the outside environment in urban areas. Making 

cities more appealing and accessible is now more crucial 

because of the positive social, cultural, and economic effects. 

If the outside environment is thermally comfortable, 

utilization of the metropolitan region is more likely to rise. 

Additionally crucial to human well-being is thermal comfort. 

This is particularly crucial in warm nations since rising 

temperatures raise the risk of heat-related illnesses. 

Furthermore, in friendly nations where suitable outdoor 

areas enhance outdoor liveability, outdoor activities are 

available for most of the year. The interior climate will also 

benefit from a thermally suitable external environment, 

resulting in less energy used for space cooling [46]. Recent 

ecosystem changes have impacted the viability of outdoor 

constructed settings [47]. Effective urban planning, which 

attempts to produce successful and useable outdoor spaces, is 

tested by the cumulative consequences of these changes in 

urban outdoor spaces. The thermal environment is given 

great significance as one factor affecting the outdoor 

environment's quality. Therefore, urban planners and 

designers investigate how people perceive and engage with 

outside weather situations. While accommodating their daily 

needs, the thermally comfortable urban environment may let 

individuals interact with their surroundings. On the other 

hand, unfavorable temperatures may make people less likely 

to engage in outside activities and use more energy for inside 

cooling [48]. One thermal comfort index is computed and 

used to indicate the combined impact of the study's 

environmental variables (such as air temperature, relative 

humidity, wind speed, and radiant temperature) and two 

individual components (such as garment insulation and 

metabolic activity level). To evaluate and forecast comfort in 

thermal settings, more than one hundred thermal comfort 

indices have been employed; the majority of these were 

created to identify interior conditions [49]. Among others, the 

top three thermal comfort indices- Physiological Equivalent 

Temperature (PET) [50], Universal Thermal Climate Index 

(UTCI) [49], and Outdoor Standard Effective Temperature 

(OUT SET) [51] were created especially for outdoor 

conditions and are frequently used in thermal comfort studies 

conducted outside. Other standard outdoor thermal comfort 

indices include PET UTCI, OUT SET, Thermal Discomfort 

Index (TDI), Effective Temperature (ET), Operative 

Temperature (TOP), and Perceived Temperature. These 

indices are in addition to PET UTCI and OUT SET (PT). The 

projected mean vote (PMV) or adaptive predicted mean vote 

was employed in several research (aPMV). However, the 

steady-state assumption of PMV may render it unreliable in 

the face of changing external circumstances. In early research, 

de Freitas [52] employed the Caloundra beachgoers as case 

studies to determine thermal sensation threshold values 

using the Skin Temperature Energy Balance Index 

(STEBIDEX) and Heat Budget Index (HEBIDEX). The Effective 

Standard Temperature (SET) thermal comfort index was 

expanded by Pickup and de Dearso that it could be used in 

outdoor situations. This thermal index has been employed in 

several comfort studies and continues to serve as the 

foundation for two-node models [46]. The most common 

outdoor thermal comfort indices utilized in recent 

investigations were PET or UTCI. Please also de Freitas and 

Grigorieva [53] and Coccolo et al. [54] for a thorough analysis 

of thermal comfort indices. Let us think about thermal 

comfort in the outdoors, with the complexity of the high 

spatial and temporal variability of environmental variables. 

The interplay between the physical environment, 

physiological, and psychological factors is even more difficult. 

Outdoor thermal comfort has been a hot topic due to 

discussions about sustainable urban settings, often 

unwelcoming developments in city centers, and the growing 

significance of open spaces under climate change [48]. A 

consistent deep core temperature of about 37oC must be 

maintained for the human body to operate appropriately, 

balancing heat gains and losses from the environment and 

basal metabolic rate. According to the physiological reactions 

of the human body, this fundamental heat balance equation 

reflecting the heat exchange between the body and the 

atmosphere has served as the foundation for current thermal 

regulations [55]. The main environmental factors influencing 

the thermal environment and comfort include air and mean 

radiant temperature, air movement, and humidity. Additional 

characteristics that define system changes that affect the 

body's heat generation and dissipate to the environment 

include behavioral acts like clothing and metabolic activity, 

along with the corresponding energy production. Solar 

radiation is an extra climatic factor in interior settings that 

have been used to describe the physiology of thermal comfort 

in the outside context. In order to assess the thermal load that 

individuals are subjected to, over 100 thermal comfort and 

stress indices have been created experimentally or based on 

advanced energy budget models. These indices have been 

used as indications for alert systems, urban planning, 

ergonomic guidance, and public weather services [48]. The 

original wind chill index was one of the earliest and most 

popular indexes to consider wind's influence on refrigeration 

[56]. This indicator has been frequently applied and modified 

in public weather forecasts [57], especially in nations with 

extremely cold climates. A workshop conducted online in 

2000 due to decades of systematic Windchilla use served as 

the foundation for creating the Windchill program. On the 

opposite end of the spectrum, Thom's discomfort index (DI), 

also known as a temperature-humidity index (THI), is a well-

liked empirical assessment for warm, humid conditions [58]. 

In the interim, urban designers developed an interest in 

thermal comfort to enhance space design. In what was known 

as the "Bioclimatic Chart," Olgyay [59] incorporated the 

impacts of many climatic components, including solar 

radiation data, which were to be employed for outdoor 

circumstances (Figure 4). The heat balance model of the 

human body used inside to determine thermal comfort levels 

was also updated by Penwarden [60] to include a term for 



M. Salmanian and A. Bayat /Future Energy                                                                        November 2023| Volume 02 | Issue 04| Pages 10-23 

15 

 

solar radiation. Different garment insulation values were 

incorporated in the Olgyay chart [59], an improvement over 

earlier models. Two different comfort charts are provided for 

wandering in the sun and the shade. There are categories for 

merely sweating, comfortable, and slightly shivering, and the 

combined effects of sun and shade with air temperature, 

wind, and different garment levels may be investigated. Later, 

Arens and Bosselmann [61] offered further recommendations 

for comfort criterion. They put forth much effort to improve 

downtown San Francisco and Toronto.  

 

Figure 4. The Olgyay bioclimatic chart [59] 

 

The Physiological Equivalent Temperature (PET), based 

on an energy balance model of human physiology, was one of 

the most widely used indices created for the outdoor setting 

[50]. Since PET utilizes oC as its unit, it is easier for experts 

other than biometeorologists to understand and is thus more 

commonly utilized. Since its creation, it has been widely used 

as a universal thermal index to evaluate thermal settings [62]. 

It has been utilized in modeling studies to assess how 

geometry and other design-related factors affect the comfort 

of outdoor spaces [46]. In contrast, Rayman and other 

software models for assessing outdoor thermal comfort 

conditions have included it as an index [63] and the three-

dimensional ENVI-MET [64]. The fact that all thermal indices, 

including PET, are based on steady-state energy balance 

models of the human body is an essential limitation of most 

thermal indices. Thermal equilibrium is an uncommon 

occurrence for humans outside, nevertheless. Because of this, 

the steady-state method is inadequate [65]. In response, COST 

Action 730 created and released the UTCI, or Universal 

Thermal Comfort Index, in the summer of 2009 [49]. The 

dynamic 340-node model developed by Fiala [66] is the 

foundation of the UTCI, which enables estimations of the 

thermal status of various body sections. With numerous 

technologies that simulate the human body's anatomical, 

thermal, and physiological characteristics, we can now 

evaluate outdoor thermal comfort to differing degrees of 

sophistication. Nevertheless, we have removed people from 

their natural environment [48]. We are facing a similar, if not 

wider, divergence in the outdoor context, much like how 

studies in climate chambers alienated people from entire 

buildings, leading to the debate between conventional and 

adaptive thermal comfort conditions [67] and ultimately to 

adaptive comfort standards [55]. Such a discussion might be 

crucial when creating public places for sustainable urban 

settings with wider consequences for climate change [48]. In 

order to better comprehend the gap between actual and 

simulated data, we need to go beyond thermal physiology 

without minimizing the thermoregulatory system's role in 

obtaining thermal comfort in an outdoor setting. The living 

person is not a "closed system," as Cabanac [68] emphasizes, 

and behavioral, and other cognitive variables may improve 

our comprehension of the subject. 

2.1.3 Surface UHI 

Surface temperatures influence air temperatures indirectly 

but significantly in the long run. A part of the urban canopy 

layer influences temperatures at the micro-level. At 

temperatures ranging from 27 to 50°C (50 to 90°F), surfaces 

exposed to sunlight, such as concrete or asphalt, can become 

hotter than the surrounding air, whilst shaded areas maintain 

similar air temperatures. These warmer floors mainly 

contribute to night-time urban heating, creating heat and 

preventing the town from cooling. This type of UHI is present 

in the weather, particularly solar radiation, and it varies 

around the planet [69]. Additionally, because they cause sun 

exposure, the micro-scale location and street geometry 

elements have a significant impact. Using a remote sensing 

approach, the surface UHI data are frequently shown as 

thermal pictures [70]. 

2.1.4 Atmospheric UHI 

Another phenomenon is a UHI in the atmosphere, which 

elevates air temperatures. Even slight variation exists 

between the atmospheric island's intensity and surface 

temperatures. The average difference in temperature 

between urban and rural areas is between 1.2 and 4.4 degrees 

(2 and 8 degrees Fahrenheit) [71]. It is the main reason urban 

regions produce warmer air than rural areas due to the 

spatial effect of UHI, which is a theoretical notion of UHIs. As 

a result, the UHI phenomenon is primarily determined by its 

atmospheric presence and is only influenced by surface 

temperatures [69]. The canopy and borders, components of 

the planetary limits, make up the two levels of any 

atmospheric UHI. Islands in the canopy layer, where humans 

reside, may be found in the lowest layer of the atmosphere 

from the Earth to its boundaries [69]. Locally, they boost the 

air's temperature in the streets or small areas. The street 

canyón, a deep, narrow city street that commonly experiences 

UHI, is a typical canopy layer occurrence [72]. The leading 

causes of this form of UHI include evapotranspiration, albedo 

change, construction materials, and urban planning [2]. 

Islands of constrained strata emerge at the mesoscale and 

impact whole cities or nearby metropolitan regions. The layer 

that stretches from the end of the canopy layer to where 

urban landscapes impact the atmosphere is known as the 

boundary layer [72]. The actual location is 2 kilometers above 

the horizon of the majority of nations. Essential aspects of 

UHIs include city layout, spatial geometry, wind and weather 

patterns, and urban energy budgets [2]. 

2.2 Urban heat island formation 

To explain processes and ramifications at the national 

and local levels, we must first understand the urban climate. 

According to Landsberg [4], the urban climate is connected to 

global climatic changes rather than being a distinct phase. 

Geological circumstances, the troposphere, and the lower 

layers of the atmosphere all impact it. The synoptic or large-



M. Salmanian and A. Bayat /Future Energy                                                                        November 2023| Volume 02 | Issue 04| Pages 10-23 

16 

 

scale atmosphere regularly interacts with the urban setting 

and produces a variety of complicated and sluggish weather 

phenomena. An essential and significant process that 

regulates emission concentrations is the effect of temperature 

on wind cycles [73]. Climates in rural and urban areas change 

due to geography and terrain structure. Urban terrain is a 

heavily built, packed, and impermeable surface, whereas 

rural or agricultural lands are typically differentiated by 

vegetation, loose soil, and open space. Based on this 

distinction, Surface Heat Islands (SHIs), the first type of UHIs, 

are created. Atmospheric Heat Islands, the second group of 

UHIs, may be distinguished from SHIs (AHIs) [4]. 

2.2.1 Urban heat island; urbanization 

In 1973, Oke [74] established the first connection between 

urbanisation, city size, and UHIs. He found a significant 

association between the population density (P) of 10 North 

American cities and the difference in urban-rural 

temperatures (T) using data and models from earlier studies. 

Urbanization and city size to UHI's is found using equation (1) 

[74]. 

 ∆𝑇𝑢−𝑟(max) = 2.96𝑙𝑜𝑔𝑃 − 6.41          (1) 

Although this model is solely centered on the ideal situation 

of UHI, the topic of urbanization and UHIs was exceptionally 

helpful. It started a series of studies on the connection 

between temperature and the metropolis. Nearly fifty years 

later, the causes of UHI training in cities were examined and 

reported. Three critical aspects result from urbanization 

processes, albeit there is no consensus on their exact causes 

and actions: 

2.2.1.1 The built environment 

The move from rural to urban has various 

implications. With this in mind, there are two immediate 

effects. Second, when settlements expand their borders, the 

natural terrain is transformed into new built-up regions. One 

of the crucial regulators in surface ecosystems, 

evapotranspiration processes, is reduced by vegetation and 

natural soil deterioration [73]. The warmth of the surface of 

the trees and the plants fell, as did the shade [75]. The 

contemporary urban surface or materials, which collect heat 

rather than reflect it, serve as enhanced heat reservoirs. The 

material's thermal emittance, heat capacity, and Albedo cause 

this. The most important is "Albedo, a diminutive of the Latin 

word albus (white). After reflecting off a surface, the amount 

of radiation or light is transmitted into the atmosphere. The 

oil's thermal absorption, heat, and Albedo bring this on. It is 

the quantity of radiation or light that the Earth emits into 

space. The Latin word albus is where the word "albedos" 

comes from "(White) and are harsher [9]. 

2.2.1.2 The human activity 

More residents are now affecting the urban landscape as 

cities become more considerable. An example is excess heat 

generated on a warm day by average air conditioning. 

Besides, people have waste heat in themselves, which results 

in higher air temperatures. These causes are called 

anthropogenic heating [5]. 

2.2.1.3 Urban geometry 

Urban geometry is another aspect affecting the UHI. The 

density of the area, measured by the houses' scale and 

distance, influences the overall temperature, particularly 

during the night [76]. Urban geometry has three influences on 

the city's climate, according to Voogt [77]. First, concentrating 

solar radiation in areas of the building leads to more excellent 

absorption of solar radiation. Secondly, the Sky View Factor 

and radiation depletion are influenced by closely spaced 

houses. Third, population density impacts air-to-surface 

traffic, which decreases convective heat loss. Three aspects 

are part of urban energy, including the built environment and 

human interaction. There are specific criteria by which urban 

geometry interacts with UHI in particular: 

Albedo changes [a]: Albedo refers to the overall percentage 

of solar energy a particular surface reflects [78]. The average 

reflectiveness time, angle, and spectrum on a specific surface 

or surface combined is what the word means, which can be 

interpreted in various ways. In other words, Albedo is the 

capacity of a surface to reflect solar radiation, which makes it 

an essential component in urban climates. To better 

comprehend different Albedos, Table 1 provides some 

common Albedos for various surfaces. We may assume that 

human surfaces that are dark have lower albedos than 

surfaces that are bright because dark surfaces receive less 

sunlight and generate more heat [73]. Connor is researching 

exactly how Albedo and urban surface temperatures are 

related. On the dark-colored surface, he saw that outlying 

neighborhoods had a higher average temperature. In 

conclusion, significantly darker materials and surfaces 

impacted by people result in decreased Albedo and heat gain 

[79]. 

Table 1. Examples of Albedo's for different surface types [79] 

 

Solar radiation/ sky view factor: Urban geometry 

frequently influences urban temperatures through solar 

Radiation and the Albedo. Based on Albedo and urban 

geometry, the sun's energy typically reflects, dissipates, and 

is absorbed in urban areas [70]. The difference between the 

two factors is how solar radiation contributes to the impact. 

Brief or visible light, which humans perceive as light, alters 

albedos. On the other hand, the consequences of urban 

geometry are susceptible to longwave or infrared radiation. 

Urban topography is essential, but the total solar radiation 

balance of absorbed heat through albedo adjustment prevails 

[80]. Longwave Radiation, usually rereleased at night into the 

atmosphere, may be contained in urban environments and 

materials during the day. Improving urban texture and the 

urban response contributes to stronger solar radiation 

absorption. Also, the radiative heat emission at night is 

disrupted because of the small open space. The urban canyon, 

a little street flanking significant buildings, is a well-known 

phenomenon of this dilemma. Although the high facilities 

Asphalt 0.05-0.10 

Concrete 0.10-0.30 

Forest 0.15 

Bare Soil 0.20-0.30 

Brick 0.20-0.40 

Green Gra 0.25 

White Cement 0.78 

Snow 0.85 



M. Salmanian and A. Bayat /Future Energy                                                                        November 2023| Volume 02 | Issue 04| Pages 10-23 

17 

 

produce shadows throughout the day, the radiation touching 

the soil is mirrored and retained in the materials several 

times. The heat is trapped, and these streets do not cool off at 

night because of the restricted entry into the open air [81]. 

The Sky View Factor frequently reflects the link between 

urban layout and thermal impacts (SVF). The SVF is an index 

representing the sky's visible surface [70]. A low SVF, for 

example, results in street heat capture and the formation of a 

street canyon. Giridharan explored the link between urban 

temperatures and the SVF after demonstrating significant 

relationships between night-time UHI and viewing variables 

in Hong Kong. Thus, the SVF Index is important in UHI 

because it measures the influence of urban geometry and 

solar radiation on urban temperatures [82]. 

Anthropogenic heat [QF]: The preceding section defined the 

heat created by human energy use, primarily by cars and 

energy use in buildings. This extra heat is thus the outcome of 

greater human mobility or production behavior. Oke [5] 

expresses the exact idea of anthropic heat as the following 

formula: 

𝑄𝐹 = 𝑄𝐹𝑉 + 𝑄𝐹𝐻 +𝑄𝐹𝑀                                                                 (2)  

The heat produced by automobiles, stationary sources (air 

conditioning), and metabolism are referred to as QFV, QFH, and 

QFM. Metabolism is the utilization of resources and the cost of 

the humans in formulation 3. Thus, elevated human behaviors 

lead to higher urban air temperatures in three distinct ways 

[80]. 

Sensible heat [H]: Sensible heat is the heat we experience 

due to surface-air differences [70]. Convection circles form 

when metropolitan areas heat the air above, removing the 

further temperature increase. However, population density 

also reduces convective heat loss. Mills [83] and Bottema [84] 

investigated the relationship between a surface-air exchange 

(or ventilation) and urban density. Figure 5 depicts how 

urban spatial patterns influence surface-air exchanges as a 

function of urban and raw material density (the standardized 

area percentage) and Z0/h longitude. It teaches us that as a 

city's built-in density grows, so does its roughness, resulting 

in less airflow and lower convective heat loss (Figure 5). This 

is accomplished in the urban canopy layer, and the proportion 

of built-up regions is modified. 

Evapotranspiration [λE]: The movement of moisture from 

the soil, plants, or trees to the atmosphere is known as 

evapotranspiration. It includes perspiration from plants and 

trees and water and solar evaporation. Areas are impacted by 

cooling [70] and assess power to deeper soil layers [85]. 

Moving from rural to urban settings has lessened this 

opportunity to cool down places. According to Bastiaanssen, 

who has researched evapotranspiration, it is a component of 

the surface's energy balance and is determined by other 

factors like soil or responsive heat [H]. This suggests that the 

system is overly intricate [86]. 

Thermal storage [G]: The usage of ground heat has not 

received as much research as other factors. In general, 

decreased solar reflectance in metropolitan locations 

improves soil heat storage. Recent research, however, has 

indicated that urban layout and certain building materials 

impact heat storage. In summary, thermal stocking and higher 

urban temperatures are the only effects attributed to the 

decreased reflection of urban materials [70]. 

 

Figure 5. Convective heat loss mills [84] 

3. Urban heat islands impact 

The most well-acknowledged advantages of UHI mostly 

pertain to well-being. To maintain and safeguard the 

environment. National discussions on UHIs and their impact 

have resulted from recent heat waves that killed thousands of 

people. However, the effects on the water and energy market 

have recently received increasing attention. Although many 

US communities have dealt with these issues for years, the 

UHI has introduced new, challenging issues that require 

sufficient attention. This section will first go through the 

impacts of UHI on cities and the areas around them, starting 

with an increase in energy usage. 

3.1 Energy 

To keep you comfortable when temperatures rise, more 

cooling is needed. As a result, suburban neighborhoods and 

large office buildings use more power and switch to air 

conditioning and other sources of cold air. A significant factor 

affecting UHIs is the increase in energy use, which also affects 

a range of other occurrences. Energy shortages are generally 

caused by rising energy usage in the following sectors: 

1. Energy production and potential shortages. This puts 

pressure on the electricity generated and provided during the 

heat wave. In order to maintain good energy sources for the 

coming decades, power output could thus be improved during 

warmer periods. Emerging technologies will also be 

introduced, and delivery and distribution will also increase. 

Nevertheless,  the energy economy is another approach to this 

problem. That is one of the most significant issues with air 

pollution in cities nowadays due to global warming [87]. 

2. Increased power production, consumption, and carbon 

emissions from new fossil fuel combustion. The impact on 

public health and air quality will be discussed in the next 

section. 

3. The increased use of water. Metropolitan primary energy 

sources continue to compress the thermodynamic cycle using 

much water [2]. 

4. Humans cause more heat pollution. Increase in human 

activity results in increased heat, known as anthropogenic 

heat. More anthropogenic heat is produced as a result of 

primary air cooling. This is a continuous circle since it is one 

of the causes of UHI. Without interference, this influence 

would merely enhance the overall impact of UHIs [8]. 

3.2 Heat stress 

The European towns and people's uneasiness during the 

2003 heat wave was made evident. The effects were 



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considered in France, with minimal adaptation and public 

awareness. In the summer, 15,000 hospital admissions and 

fatalities were recorded [89]. The heatwave claimed the lives 

of over 35,000 people in Europe, which sparked several 

discussions regarding heatwaves, UHIs, and their effects at 

the national and international levels. Klinenberg offers a 

different illustration of how heat waves and UHIs might have 

an impact [90]. Heat waves and UHIs in cities have severe and 

significant health effects. Urban officials and politicians 

usually lack awareness of their predicament, which results in 

inadequate education and an underestimation of the thermal 

danger. Medically speaking, a person is in danger if they have 

heat stress, a condition in which their core body temperature 

rises significantly. Some symptoms are heat cramps, redness, 

and health hazards such as heat stroke [91]. As a result, heat 

waves and exhaustion threaten urban public health. 

Additionally, social and other variables raise the risk of heat 

stress. For instance, old and socially isolated persons are 

more vulnerable to heat waves than others. The United States 

Centre for Control and Prevention of Diseases (CDC) has 

published preventive guidance for personal health and safety 

on its website on these additional factors. According to the US 

Centers for Disease Control and Prevention (2009), the 

following are some of the hazards and susceptible groups: 

1. Elderly people and kids who are not watched by or under 

control. 

2. Individuals who are unobserved or uncontrolled and are 

socially or physically isolated. 

3. A lack of preparedness and knowledge. 

4. Insufficient hydration consumption, irrespective of the 

amount of activity.  

5. Increasing heat quickly in cars or other vehicles. 

6. Outdoor activities that are not regulated or watched 

As a result, some groups of people and circumstances also 

exacerbate the hazards associated with metropolitan heat. 

Residents must be informed of the dangers of heat waves to 

shield themselves from the repercussions. Based on the 

knowledge a person may have access to, this is essentially a 

responsibility of the individual concerning heat stress [91]. 

3.3 Air quality 

UHI has negative impacts on urban air quality, even 

though they are caused mainly by intense stress on public 

health. Higher temperatures increase energy requirements in 

urban settings, as this section addresses. Increased demand 

immediately correlates to increased oil output, which has the 

impact of raising fossil fuel carbon [70]. Smog is moreover 

frequently brought on by high temperatures. According to 

Heat Island Research Group studies, every degree of 

Fahrenheit beyond 70°F. Accidents involving smog have 

increased by 3%. Smog and previous pollutants harm the 

human body, causing low discomfort, severe breathing 

conditions, and even lung cancer [92]. 

3.4 Water resources 

UHI's role in this situation is significant for four reasons: 

First, a general temperature increase impacts water 

resources in the area, increasing drought and reducing 

availability for the metropolis [2]. This deficiency impacts 

many areas, including public health, industry, climate 

efficiency, marine habitats, etc. Second, heat emission 

happens when precipitation strikes urban surfaces like 

buildings and floors. After that, the water temperature is 

automatically increased. The gross rise may reach 7 degrees 

Fahrenheit when it reaches the sewer. Following transit and 

deposition in the lakes, rivers, and streams, the elevated 

temperature will impact the existence and habitats of aquatic 

ecosystems [93]. Thirdly, a lack of clean water significantly 

impacts agricultural productivity, typically consuming 75% of 

a region's total water supply. With less water available, crops 

and yield suffer, and agricultural commodities' quality and 

output decrease. The Waterplan should end this and provide 

plenty of water for both urban and rural areas [94]. Fourth, in 

addition to the biological impacts of water quality, elevated 

temperatures directly impact the biosphere. Especially when 

natural settings undergo fast changes, natural species and 

ecosystems cannot adapt, which results in decreased 

exosomes and a loss of biological diversity. UHIs are 

hazardous to whole ecosystems and animals because they 

cause a considerable temperature spike over a certain period 

[89]. 

3.5 Economics 

Anything used to be expensive. Calculating the dynamic 

evolution and composition of the UHI and its outcomes is 

more expensive. However, higher carbon dioxide and ozone 

levels are linked to more illnesses and higher hospital and 

healthcare costs. Furthermore, during periods of harsh 

weather, production and human activity decrease. For 

instance, outdoor work is affected by high temperatures and 

slows down during heat waves, especially building and 

maintenance. Taking corrective and mitigating action is also 

advantageous for the city [8]. 

4. Discussion: Urban Heat Islands Design Strategies 

Adding such theoretical backgrounds gives the basis for 

UHI adaptation/mitigation. This section aims to 

conceptualize all potential urban planning and architecture 

policy initiatives in line with the study design. An outline of 

proposed potential approaches focused on scientific articles 

has been made here to accomplish this conceptualization. 

4.1 Urban Forestry  

The loss of vegetation restricts the process of 

evapotranspiration and the release of latent heat. As large-

scale urban expansion patterns develop, this is one of the 

primary causes of the UHI effect. Therefore, conserving 

present biomass while planting new trees and plants is a clear 

action. Urban forestry increases the amount of 

evapotranspiration, the number of shadows it casts, and the 

amount of sunlight that may enter the canopy. Kurn et al. [95] 

and the US Environmental Protection Agency [70] estimated 

that woods could be up to 5°C [9°F]. Suburban neighborhoods 

containing plants and trees are 2-3°C [4-6°F] cooler than 

comparable non-green neighborhoods. Colder than open 

regions. Other research has also shown how vegetation 

lowers the urban temperature, including Yoshida [96] and 

Nabeshima [97]. 

4.2 Cool roofs 

The roof is one of the two main factors influencing the 

urban Albedo. As was covered in the Albedo section, it affects 

the balance between solar energy absorption and reflection. 

By absorbing sunlight, darker surfaces may heat up to 82 °C 

(182 °F), which impacts air temperatures. On any given day, 



M. Salmanian and A. Bayat /Future Energy                                                                        November 2023| Volume 02 | Issue 04| Pages 10-23 

19 

 

conventional roofs can be between 55 and 85°F [31-47°C] 

cooler than the air, according to considerable research on the 

efficiency of cool roofs by Konopacki et al., whereas cold roofs 

appear to settle at a temperature between 10 and 20°F (6-

11°C) [98]. There are three main categories of cooling-down 

roofs: single-ply membranes, cool roof coatings, and biomass. 

The first and second types of cool roofs thus employ unique 

materials that change the solar radiation budget. The third 

type of roofing, called "green roofing," combines cool roofing 

with more unusual urban flora. Especially in large building 

projects and residential neighborhoods, cool and green roofs 

are extensively employed in the US. 

4.3 Cool Pavement  

Like cool roofs, heated flooring raises temperatures 

throughout the urban energy budget. Figure 6 illustrates a 

roadway with typical pavement and heating effects. The 

temperature of the surface is in the range of 140 to 150 °F. the 

temperature of the road (is 60-65oC). Traditional flooring 

keeps the heating fuel in place, raising the air and surface. 

Permeable floors are only one example of cutting-edge, cooler 

flooring developed through various research methods. When 

moisture is present, this flooring enables air, water, and water 

to move through the floor to avoid cooling [70]. Further 

research on cooling pavements is done by Haselbach [99] and 

Mallick [100], concentrating on the various options to reflect 

solar light as effectively as feasible. 

 

Figure 6. The temperature of pavements [100] 

 

4.4 Green Buildings  

The term "green building" is somewhat ambiguous since 

it refers to various laws, regulations, standards, and building 

materials emphasizing long-lasting constructions. As a result, 

not all of these treatments were specifically designed to 

adjust to UHIs; other events impacted some. However, all 

green building activities were supervised by the US Green 

Building Council (USGBC), a nonprofit organization that 

promotes green buildings globally. The primary endeavor of 

this organization is The Leed, a world certification system. 

Green building solutions may be used in the design, 

construction, operations, and maintenance with the help of 

this accreditation [101].  

5. Conclusion 

Although there are several recommendations and 

standards for reducing the urban heat island, each city's 

circumstance is unique. In order to lessen the severity of the 

UHI, political decision-makers, legislators, or urban planners 

must implement several methods addressed in this research. 

However, the city's well-planned tree-planting initiative is its 

main tactic for reducing the severity of the UHI. The four rest 

tactics are impacted by increasing the awareness strategy. 

Without sufficient knowledge of the effects of the outdoor 

living environment on the enclosed environment and the 

extent to which it might jeopardise human comfort and 

health, appropriate levels of comprehension of land 

management and plant cover, roof cover and new materials, 

buildings and traffic activity strategies will not be attained. 

Political decision-makers, planners, and architects must put 

more effort and support into decreasing the UHI and 

lessening its impacts on the city. The general people must 

exert fresh and increased pressure on political decision-

makers so that they are forced to accept the necessity of 

important new national and regional initiatives on urban 

sustainability without reservation. Planning and designing for 

the UHI of the city requires developing several techniques and 

rules that guarantee the cities stay vibrant and aesthetically 

built as planned. The city's sustainable, liveable, beautiful, and 

prosperous vision may be achieved using climate-responsive 

design principles. 

Ethical issue 

The authors are aware of and comply with best practices in 
publication ethics, specifically concerning authorship 
(avoidance of guest authorship), dual submission, 
manipulation of figures, competing interests, and compliance 
with policies on research ethics. The authors adhere to 
publication requirements that the submitted work is original 
and has not been published elsewhere in any language. 

Data availability statement 
Data sharing does not apply to this article as no datasets were 

generated or analyzed during the current study.  

Conflict of interest 

The authors declare no potential conflict of interest. 

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