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Pottireddippatti, a small town in Tamil Nadu, India, sits at coordinates 11.1659°N, 78.2708°E, within the Dharmapuri district. The terrain is largely characterised by relatively flat plains, typical of the region’s agricultural heartland. The town’s elevation is modest, contributing to limited natural dispersion of pollutants. Pottireddippatti is not directly adjacent to major bodies of water, though it lies within the broader catchment area of the Cauvery River system, influencing local humidity and microclimates. Surrounding the town are extensive agricultural lands, primarily dedicated to crops like mango, groundnut, and paddy. While not a major industrial hub itself, Pottireddippatti is situated within reach of industrial activity concentrated around Salem and Krishnagiri, potentially contributing to regional background pollution levels. The urban-rural gradient is pronounced; the town serves as a market and service centre for surrounding villages, leading to increased vehicular traffic and localised emissions. Dust from agricultural practices, particularly during harvest seasons, is a significant factor. The town’s location, sheltered by gentle hills to the west, can exacerbate pollution build-up during periods of calm winds. This geographical setting, combined with agricultural and regional industrial influences, shapes the air quality challenges faced by Pottireddippatti.

Pottireddippatti 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 reduced rainfall for atmospheric cleansing. February and March are typically the worst months, with dry winds carrying dust across the plains. The onset of the southwest monsoon in June brings a temporary improvement, washing away pollutants and increasing humidity. However, increased cloud cover can also lead to temperature inversions, trapping pollutants near the ground. The monsoon season, lasting until September, generally offers the cleanest air, though localised flooding can contribute to microbial pollutants. October and November mark a transitional period, with decreasing rainfall and a gradual build-up of pollutants. The northeast monsoon, arriving in late November, provides a second, shorter period of improved air quality. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor activity during the peak dry season (February-March) and be mindful of potential respiratory irritation during periods of high humidity. Monitoring wind patterns is crucial, as calm conditions exacerbate pollution.