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Uthiramerur is a small town situated in the Kanchipuram district of Tamil Nadu, India, positioned at coordinates 12.6055°N, 79.7542°E within the broader South Asian context. Nestled in the Eastern Ghats foothills, the town lies at an elevation of approximately 60 meters above sea level, characterized by a gently undulating terrain that transitions from the coastal plains to the inland plateau. Its location places it about 85 kilometers southwest of Chennai and 40 kilometers from the Bay of Bengal, though it remains inland enough to avoid direct maritime influences on air quality. The surrounding landscape is predominantly agricultural, with extensive paddy fields, sugarcane plantations, and coconut groves dominating the rural hinterland, creating an urban–rural gradient where the town serves as a local administrative and market center. Proximity to the Palar River basin, though often seasonal, contributes to soil moisture but also to dust generation during dry periods. This agricultural setting, combined with unpaved rural roads, means that particulate matter from road dust and agricultural burning readily infiltrates the urban area. The town is not part of a major industrial belt, but localized brick kilns and traditional biomass cooking practices add to the pollution mix. The tropical wet-and-dry climate, with its distinct wet and dry seasons, exacerbates air quality issues as stagnant conditions during the dry months trap pollutants, while the terrain's low elevation offers little natural ventilation against emissions from surrounding farmlands and vehicular traffic on connecting routes.

In Uthiramerur, air quality follows a pronounced seasonal rhythm shaped by its tropical wet-and-dry climate and local emission patterns. During the winter months from November to February, pollution peaks sharply due to a combination of meteorological and human factors. Cooler temperatures, especially at night, lead to frequent temperature inversions that trap pollutants near the ground, while calm winds and morning fog further reduce dispersion. This period coincides with post-harvest agricultural burning in the surrounding fields, brick kiln operations at full capacity, and increased biomass burning for heating, creating a hazardous mix of particulate matter. Sensitive groups, such as children, the elderly, and those with respiratory conditions, should avoid outdoor activities in the early mornings and evenings during these months. The summer season from March to May brings extreme heat, which can elevate ozone levels from vehicle emissions, though stronger daytime winds and convective activity provide some cleansing. However, road dust from unpaved surfaces becomes more problematic as soils dry out. The southwest monsoon from June to September offers relief, with heavy rains washing pollutants from the air and reducing biomass burning, making this the best time for outdoor activities. The brief northeast monsoon in October and November can initially increase humidity and particulate resuspension before giving way to the winter peak. Year-round, vehicle emissions and cooking with biomass contribute a baseline of pollution, but the winter inversion layer is the critical factor that residents must navigate for health protection.