Urban Pollution Domes in India: Spatio-Temporal Patterns, Driving Factors and Environmental Implications

Rapid urbanisation, industrialisation, motorisation and energy consumption have intensified atmospheric pollution across Indian cities, yet the spatial distribution of urban pollution is considerably more complex than the conventional image of a uniformly polluted city centre. This paper examines the spatio-temporal characteristics, principal drivers and environmental implications of urban pollution domes in India through a critical synthesis of satellite observations, ground-based air-quality measurements, meteorological evidence and recent peer-reviewed research. The study is secondary-data based and adopts a descriptive-analytical and comparative geographical approach. Particular attention is given to the Urban Aerosol Island framework, in which aerosol optical depth or particulate concentrations over urban areas are compared with their non-urban surroundings. Evidence from 141 Indian cities demonstrates a pronounced geographical contrast: conventional Urban Aerosol Pollution Islands are more prevalent in southern and southeastern cities, whereas many northern and northwestern cities display relative Urban Aerosol Clean Islands because high regional background aerosol loading can obscure or “puncture” the urban dome. Seasonal variations are equally important, with post-monsoon conditions favouring positive urban aerosol contrasts, while transported mineral dust increasingly influences northern and western India during winter and pre-monsoon periods. Local emissions, urban morphology, wind stilling, atmospheric stability, regional dust transport, biomass burning and agricultural land-use cycles collectively determine pollution-dome intensity. The paper concludes that Indian urban air pollution cannot be effectively governed through city-specific emission control alone. Integrated urban–regional airshed management, improved urban–rural monitoring and stronger coupling of satellite and surface observations are required for effective clean-air policy.