id	keyword
esrj-114296	pollution
esrj-114296	air pollution
esrj-114296	covid-19
esrj-114296	density
esrj-114296	population
esrj-114296	log
esrj-114296	cities
esrj-114296	health
esrj-114296	april
esrj-114296	levels
esrj-114296	correlation
esrj-114296	infections
esrj-114296	regions
esrj-114296	coccia
esrj-114296	research
esrj-114296	transmission
esrj-114296	days
esrj-114296	spread
esrj-114296	err