Analysis of the effect of COVID-19 lockdown on air pollutants using multi-source pollution data and meteorological variables for the state of Uttar Pradesh, India. MAUSAM [Internet]. 2023 Oct. 1 [cited 2025 Dec. 22];74(4):999-1014. Available from: https://mausamjournal.imd.gov.in/index.php/MAUSAM/article/view/6124