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North Dumdum is a densely populated suburban municipality situated in the Kolkata Metropolitan Area of West Bengal, India, positioned at coordinates 22.6600°N, 88.4200°E. Located approximately 15 kilometres northeast of central Kolkata, it occupies a strategic position within the Ganges-Brahmaputra delta region, characterized by flat alluvial plains with minimal elevation variation, typically just a few metres above sea level. This low-lying terrain, combined with proximity to the Hooghly River and numerous wetlands, creates a humid environment that traps pollutants close to the ground. The city's urban character blends residential neighbourhoods with commercial zones and informal settlements, forming part of Kolkata's expanding urban sprawl. Its location near Netaji Subhas Chandra Bose International Airport subjects it to significant aviation emissions, while its position along major transportation corridors connecting Kolkata to northern suburbs ensures heavy vehicular traffic. The surrounding landscape transitions from dense urban development to peri-urban areas with small-scale industries and agricultural plots, creating a complex pollution gradient. Industrial emissions originate primarily from local manufacturing units and brick kilns scattered throughout the region. This geographic setting—flat, low-lying, and enveloped by metropolitan activity—creates a natural basin effect where pollutants accumulate rather than disperse, exacerbated by the area's high humidity and frequent temperature inversions.

North Dumdum's air quality follows a distinct seasonal pattern shaped by its tropical wet-and-dry climate. During winter (November to February), pollution peaks dramatically due to meteorological conditions: cool temperatures create frequent ground-level temperature inversions that trap pollutants, while calm winds from the northwest fail to disperse emissions. Dense fog and haze often blanket the region, combining with vehicle exhaust, construction dust, and waste burning to create hazardous conditions. These months should be avoided for prolonged outdoor activities, especially by sensitive groups like children, elderly residents, and those with respiratory conditions. Spring (March to May) brings some relief as temperatures rise and winds increase, though extreme heat events and nor'westers (violent thunderstorms) can temporarily stir up dust and pollutants. The summer monsoon (June to September) offers the cleanest air, as heavy southwest monsoon rains wash pollutants from the atmosphere and strong winds provide effective dispersion. This period is ideal for outdoor activities. Post-monsoon (October) sees a rapid deterioration as rains cease, temperatures drop, and pollution sources reactivate, setting the stage for winter's peak. Throughout the year, residents should monitor local air quality advisories, use masks during high pollution periods, and schedule outdoor exercise for monsoon months when particulate levels are lowest.