Corona Virus: A Big Threat of 2019-20

This book is all about covid-19, its effect, awareness etc., because we know that today maximum countries around the world have been shut down just because of Corona Virus Disease 2019 (COVID-19) .Though this virus disturbed everything and had a negative effect around the world, there are several positive things which have been done because of COVID-19 and this research has been carried out to highlight the positive things which happen just because of this virus [2]. We know that the pollution is one of the biggest problems and it was continually increasing day by days in the past years like air pollution, noise pollution, water pollution etc. and this pollution increase just because of human activities [3]. But in 2020 as corona shutdown the maximum countries, the big fall in the increasing line of pollution has been noticed and this fall happened because of ban in human activities.