Ferdous, M.N., Islam, M.A., Chakrabortty, P. and Kabir, S. 2021. Covid-19 Lockdown and Changes of Air Quality in the Most Polluted City of Bangladesh. Journal of Scientific Research. 13, 3 (Sep. 2021), 707–714. DOI:https://doi.org/10.3329/jsr.v13i3.50647.