INTEGRAL ASSESSMENT OF ATMOSPHERIC AIR QUALITY IN THE LARGEST CITIES OF RUSSIA BASED ON TROPOMI (SENTINEL-5P) DATA FOR 2019–2020 Article Elagin P.O., Morozova A.E., Sizov O.S., Agzamov N.A., Fedash A.V., Lobzhanidze N.E. Cosmic Research. Maik Nauka Publishing / Springer SBM. Vol. 60. 2022. P. S57-S68