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Chinnasekkadu, a small town in Tamil Nadu, India (13.1609°N, 80.2573°E), is situated within the broader Indo-Gangetic Plain’s influence, though buffered by the Eastern Ghats. The terrain is largely flat, characteristic of the coastal plains, with an elevation hovering around 60-70 meters above sea level. This low-lying geography contributes to limited natural dispersion of pollutants. The town’s position isn’t directly coastal, but lies within a network of irrigation canals and smaller waterways feeding from the larger river systems of the region, influencing local humidity and potentially trapping pollutants during calm conditions. Chinnasekkadu is surrounded by predominantly agricultural land, primarily paddy cultivation, with increasing pockets of small-scale industrial activity related to rice milling and related processing. The urban-rural gradient is quite sharp; the town itself is compact, quickly transitioning to agricultural fields. This proximity to agricultural practices introduces sources of particulate matter from crop residue burning and fertilizer application. The regional wind patterns, influenced by the seasonal monsoon, play a crucial role in pollutant transport, sometimes bringing in pollutants from larger industrial centres further inland, and at other times, offering some relief through dispersal. The lack of significant natural barriers to airflow, combined with the flat terrain, means pollutants can accumulate easily, particularly during temperature inversions.

Chinnasekkadu experiences a tropical climate with distinct wet and dry seasons, heavily influencing air quality. The dry season, roughly from January to May, sees the poorest air quality. Lower humidity and stagnant air allow particulate matter from agricultural activities – post-harvest burning of rice straw is common – and local industries to accumulate. Temperature inversions are frequent during the cooler mornings of these months, trapping pollutants near ground level. March and April are typically the worst months for respiratory issues. The arrival of the southwest monsoon in June brings a temporary improvement, as rainfall washes away pollutants. However, increased humidity can also foster mold growth, impacting indoor air quality. The monsoon season (June-September) is generally the cleanest period, though localized flooding can stir up sediment and contribute to microbial pollutants. Post-monsoon (October-November) sees a gradual deterioration as agricultural activity resumes and the air becomes drier. December offers a slight respite before the cycle begins again. Sensitive groups – children, the elderly, and those with pre-existing respiratory conditions – should limit outdoor exposure during the dry season and monitor their health closely. Avoiding peak hours near agricultural areas during burning season is advisable.