Majumder, Ahmad Kamruzzaman, Abdullah Al Nayeem, Mahmuda Islam, William S Carter, Razib, and SM Munjurul Hannan Khan. 2021. “Effect of COVID-19 Lockdown on Air Quality: Evidence from South Asian Megacities: 10.32526/Ennrj/19/2020230”. Environment and Natural Resources Journal 19 (3). Nakhon Pathom, Thailand:195-206. https://ph02.tci-thaijo.org/index.php/ennrj/article/view/241989.