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Gangavalli, a small town in the Salem district of Tamil Nadu, India, is situated at coordinates 11.4983°N, 78.6461°E. The town’s geography is defined by the undulating foothills of the Eastern Ghats, creating a varied terrain of gentle slopes and small valleys. With an elevation of approximately 250 meters, Gangavalli benefits from a relatively moderate climate, though its inland location contributes to temperature extremes. The surrounding landscape is predominantly agricultural, dominated by coconut groves, mango orchards, and dryland farming. The town lies within a region known for its granite quarries, a significant local industry. This, coupled with agricultural practices like seasonal crop burning, directly impacts local air quality. The urban-rural gradient is pronounced; Gangavalli itself is a relatively small urban centre, quickly transitioning to rural farmland in all directions. Its distance from major industrial belts like Coimbatore and Tirupur mitigates some large-scale pollution sources, but localised emissions are a concern. The lack of significant water bodies nearby means limited natural dispersion of pollutants, and the topography can trap air during periods of calm weather. The town’s position within the Tamil Nadu plateau influences wind patterns, often channeling air flows along valleys, potentially concentrating pollutants.

Gangavalli experiences a tropical climate with distinct wet and dry seasons, heavily influencing air quality. The dry season, from January to May, sees consistently higher particulate matter concentrations due to dust from agricultural activities and quarrying, exacerbated by low humidity and stable atmospheric conditions. February and March are typically the worst months for respiratory issues. The southwest monsoon arrives in June, bringing relief with rainfall that washes away pollutants, resulting in improved air quality. However, increased humidity can also foster mold growth, impacting those with allergies. The monsoon gradually recedes in September-October, with a brief period of relatively clean air. The northeast monsoon, arriving in November, brings further rainfall but also increased cloud cover and potential temperature inversions, trapping pollutants near the ground. November and December can see a resurgence of particulate matter, though generally lower than the pre-monsoon peak. Sensitive groups – children, the elderly, and those with pre-existing respiratory conditions – should limit outdoor activity during the dry season and periods of stagnant air. Monitoring local weather patterns and avoiding peak dust times are crucial for protecting health.