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Sūrappalli, a small town in Tamil Nadu, India, rests at coordinates 11.7187°N, 77.8778°E, within the broader Kongu Nadu region. The terrain is largely flat, characteristic of the fertile plains of the Cauvery River basin, though gentle undulations are present. Situated approximately 15km from Bhavani and 70km from the larger city of Tiruppur, Sūrappalli’s geography is dominated by agricultural land, primarily dedicated to coconut, paddy, and sugarcane cultivation. The Noyyal River, a tributary of the Cauvery, flows nearby, influencing local humidity and potentially contributing to localised fog formation during cooler months. The surrounding landscape is a mosaic of agricultural fields interspersed with small pockets of vegetation. While not directly within a major industrial belt like Tiruppur’s textile hub, Sūrappalli experiences indirect impacts from regional industrial activity, particularly concerning particulate matter transport. The urban-rural gradient is pronounced; the town itself is relatively compact, with air quality potentially worsening closer to road networks and local brick kilns. The relatively low elevation contributes to limited atmospheric dispersion, meaning pollutants can accumulate, especially under stable atmospheric conditions. This geographical setting dictates the specific challenges and patterns of air quality in Sūrappalli.

Sūrappalli experiences a tropical climate, broadly divided into wet and dry seasons. Air quality generally improves during the Southwest Monsoon (June-September) as rainfall effectively washes particulate matter from the atmosphere. However, increased humidity can also foster mould growth, impacting respiratory health. The post-monsoon period (October-November) sees a temporary improvement, but this is often short-lived. The dry season (December-May) is when air quality deteriorates significantly. Winter months (December-February) often experience temperature inversions, trapping pollutants near the ground, exacerbated by calm wind conditions. Dust from agricultural activities and construction contributes to higher particulate matter levels. March to May are typically the worst months, with high temperatures and dry winds promoting the suspension of dust and pollutants from regional sources. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor activity during these periods. The northeast monsoon (October-December) can bring localised flooding, potentially releasing pollutants from stagnant water. Monitoring wind patterns is crucial; winds from the northwest often carry pollutants from industrial areas towards Sūrappalli.