Covid-19 is the disease which is due to a corona virus family virus. This virus spreads through human to human contact which should be infect or human contact to any infected thing. So mainly heavily populated countries are mainly affected due to this. So to prevent themselves from covid-19 disease almost all affected high dense countries have announce the complete & proper lockdown to all industries, vehicles etc. So due to stoppage of these activities the air pollution level of these areas will fall down & these area will be less polluted.
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