Prasad*, N.K. , P. Sasikala, S. Ramesh, Sarma, M. , Mathew, T. , T. Anil Babu and N. Madhavi 2021. A Review of COVID-19: Nature of the Virus and Impact of Lockdown on Air Pollution over India and the World. CURRENT APPLIED SCIENCE AND TECHNOLOGY. 21, 4 (Mar. 2021), 788–795.