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Nerkunram, a municipality in the Tiruvallur district of Tamil Nadu, India, occupies a relatively flat terrain at an elevation of approximately 210 meters above sea level. Its coordinates (13.0619°N, 80.2094°E) place it within the Coromandel Coast plain, a region characterized by alluvial soils and a humid subtropical climate. The surrounding landscape is predominantly agricultural, with rice paddies and other cultivated lands dominating the immediate vicinity. While not directly on the coast, Nerkunram is influenced by the Bay of Bengal, experiencing maritime air masses that contribute to its humidity. The city is part of the larger Chennai Metropolitan Area, experiencing increasing urban sprawl and connectivity. This proximity to Chennai, a major industrial hub, is a significant factor influencing Nerkunram’s air quality. The urban-rural gradient is becoming increasingly blurred as development extends outwards. Dust from construction activities, vehicular emissions from the growing road network, and emissions from small-scale industries within and around Nerkunram contribute to localized pollution. The lack of significant natural wind corridors to disperse pollutants exacerbates the situation, particularly during calmer weather conditions. The area’s topography offers limited natural ventilation, trapping pollutants near ground level.

Nerkunram’s air quality follows a distinct seasonal pattern. The pre-monsoon months of April and May bring peak pollution levels, driven by high temperatures, low humidity, and stagnant air. Dust storms are common, and agricultural burning, though officially restricted, contributes significantly to particulate matter. The Southwest Monsoon, arriving in June, offers temporary relief, washing away pollutants with heavy rainfall. However, increased humidity can also foster the formation of secondary pollutants. The post-monsoon period (October-November) sees a resurgence of pollution as temperatures rise and wind speeds decrease. This is often compounded by the burning of crop residue after the harvest. The cooler, drier months of December and January generally experience the best air quality, with moderate winds aiding dispersion. However, temperature inversions, where a layer of warm air traps cooler air near the surface, can still lead to localized pollution build-up. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor activity during April-May and October-November. Monitoring local weather patterns and avoiding peak traffic hours are crucial for minimizing exposure. Fog during winter mornings can also trap pollutants, requiring caution.