Urban Aerosol Clean Islands : Recently, a 17-year satellite-based study (2003–2020) of 141 Indian cities found that several cities in the north and northwest Indo-Gangetic Plain have lower aerosol levels than nearby rural areas. Researchers from IIT Bhubaneswar have dubbed these cities "Urban Aerosol Clean Islands“.
o 43% of cities (mainly in north & northwest Indo-Gangetic Plain) had lower aerosol levels than surrounding areas, termed Urban Aerosol Clean Islands.
o Clean island effect was most visible during pre-monsoon due to dust transport; disappears during monsoon and less prominent in winter.
o Wind Stilling Effect: Caused by urban structures slowing surface winds, creating atmospheric stagnation zones.
ü These act as invisible barriers, blocking long-range dust and pollution, especially from the Thar Desert and biomass burning.
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