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Aerosols source can be anthropogenic or natural aerosols include smoke, dust, exudates from trees and geyser
vapor and anthropogenic aerosol particulate air pollutants and smoke include natural aerosols. In this study is form
October 2004 to September 2019 are extracted using Moderate Resolution Imaging Spectroradiometer (MODIS) &
Ozone Monitoring Instrument (OMI) of remote sensing data across four metro cities in (Chennai, Mumbai, New
Delhi & Kolkata) India. AOD, AE, AI, SSA, daily, monthly mean and annual variations between 2004-2019. And
also classify aerosol based on various seasons such winter (Dec-Feb), Pre monsoon (March-May), Monsoon (Jun-
August), Post Monsoon (Sep-Nov) Aerosol classify into 4 type (Marinetime, Dusty, Urban, Biomass burning),
(winter, Pre monsoon, Monsoon, Post Monsoon). AOD, AE, AI, SSA, monthly mean and annual variations between
2004-2019. The daily mean maximum values of AOD, AE, AI and SSA is 0.69, 1.55, 1.41, 0.93. and minimum values
are 0.39, 1.34, 1.00, 0.92. maximum monthly mean variation of AOD, AE, AI ,SSA is 0.72, 1.54, 1.31, 0.93, and
maximum yearly mean variation are 0.72, 1.54, 1.31, 0.93. similarly minimum monthly mean variation of AOD, AE,
AI ,SSA is 0.39, 1.19, 0.20, 0.92, and minimum yearly mean variation are 0.38, 1.21, 0.22, 0.92. The rise in AOD
over Delhi and Kolkata can be due to increased urbanization and burning of biomass. and overall classification of
dominated zones are maximum values in marinetime of monthly mean values are in maximum (32%) in Chennai
and minimum (9%) in New Delhi, and maximum values in Dusty of monthly mean values are in maximum (24%) in
New Delhi and minimum (9%) in Mumbai. and maximum values in Urban of monthly mean values are in maximum
(42%) in Chennai, and minimum (21%) in New Delhi, and maximum values in Biomass Burning of monthly mean
values are in maximum (46%) in New Delhi, and minimum (9%) in Chennai. For dominated zones are maximum
seasonal classification for marinetime (25%) in Pre monsoon and minimum (8%) in monsoon, and maximum
seasonal classification for Dusty (36%) in Monsoon and minimum (6%) in Winter. and maximum seasonal
classification for Urban (41%) in Pre monsoon and minimum (5%) in monsoon, and maximum seasonal
classification for Biomass burning (37%) in post monsoon and minimum (13%) in Pre monsoon. AODs decreased at
Chennai and Mumbai high-altitude locations. AODs and wind speeds increased over New Delhi. |