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Ambattur occupies a distinctive position within the Chennai Metropolitan Area in Tamil Nadu, India, situated approximately 15 kilometres west of the Bay of Bengal coastline. This industrial suburb lies on the flat coastal plains of the Coromandel Coast, with minimal elevation variation averaging around 15 metres above sea level, which significantly impedes natural pollutant dispersion. The city's geography is defined by its location within the Palar River basin, though the river itself is often seasonal and prone to drought, contributing to dust issues. Ambattur's urban character is heavily industrial, anchored by the expansive Ambattur Industrial Estate—one of South Asia's oldest and largest industrial zones—which creates a dense concentration of manufacturing units amidst residential neighbourhoods. This creates a stark urban-rural gradient, with the city transitioning abruptly from industrial corridors to peri-urban and agricultural zones to the west, where paddy fields and scrubland still exist. Proximity to the Buckingham Canal and several lakes provides some hydrological features, but these water bodies often face pollution challenges themselves. The city's position within the Chennai conurbation means it's affected by regional pollution transport, particularly during northeasterly winds that can carry marine aerosols mixed with urban emissions. The flat terrain combined with high urban density creates what urban geographers term an 'air pollution basin,' where industrial emissions from the estate, vehicle exhaust from major highways like the Chennai Bypass, and construction dust from rapid urbanization become trapped, especially during calm weather conditions typical of the tropical wet-and-dry climate.

Ambattur's air quality follows a distinct seasonal rhythm shaped by its tropical wet-and-dry climate and meteorological patterns. During the northeast monsoon season (October to December), increased rainfall helps wash away particulate matter, leading to relatively cleaner air, though humidity can sometimes trap pollutants near the surface. The post-monsoon period from December through March represents the peak pollution season, when calm winds, frequent temperature inversions, and cooler nighttime temperatures create a lid over the city that traps industrial and vehicular emissions. This period often sees thick morning fog mixed with pollution haze, particularly problematic in January and February when atmospheric stability is highest. Sensitive groups including children, elderly residents, and those with respiratory conditions should minimize outdoor activities during morning hours in these months. The summer months (April to June) bring extreme heat and strong sea breezes from the Bay of Bengal, which help disperse pollutants but also stir up road and construction dust, creating periodic spikes in particulate matter. The southwest monsoon (June to September) provides relief with regular rainfall that scrubs the atmosphere, though high humidity can make existing pollutants feel more oppressive. For those planning outdoor activities, the late monsoon months of October and November typically offer the most favourable conditions, while December through March should be approached with caution, especially for vulnerable populations who may benefit from using air purifiers indoors and avoiding outdoor exercise during pollution episodes.