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Samsikāpuram, a town in Tamil Nadu, India, rests at coordinates 9.4156°N, 77.5917°E, and supports a population of approximately 15,379. Geographically, the town is situated within the fertile plains of the Kaveri Delta region, a landscape dominated by agricultural land dedicated primarily to rice cultivation. The terrain is largely flat, with a gentle slope towards the east, influencing drainage patterns and potential for localised flooding during heavy rainfall. Samsikāpuram’s proximity to the Kollidam River, a major distributary of the Kaveri, introduces humidity and influences local microclimates. The surrounding landscape is a mosaic of paddy fields, coconut groves, and scattered rural settlements. While not a major industrial hub itself, Samsikāpuram is increasingly influenced by industrial activity in nearby towns like Tiruchirappalli and Thanjavur, creating a gradient of pollution exposure. The urban-rural gradient is pronounced; air quality deteriorates as one moves closer to transport corridors and areas with brick kilns or small-scale manufacturing. This location, while benefiting from agricultural productivity, presents challenges for air quality due to agricultural burning, dust from unpaved roads, and the potential for pollutant transport from regional sources. The flat terrain also limits natural dispersion of pollutants, exacerbating localised air quality issues.

Samsikāpuram experiences a tropical climate with distinct wet and dry seasons, profoundly impacting air quality. The dry season, from January to May, sees a build-up of particulate matter due to dust from agricultural activities and increased vehicle emissions as crops are harvested and transported. February and March are typically the worst months for dust-related pollution. The onset of the southwest monsoon in June brings temporary relief, washing away pollutants and increasing humidity. However, the monsoon season (June-September) can also see localised flooding, leading to the spread of fungal spores and increased respiratory issues. October and November witness a transitional period, with receding monsoon rains and a gradual increase in temperature, often accompanied by stagnant air conditions and temperature inversions that trap pollutants near the ground. December offers the most favourable air quality, with cooler temperatures and the influence of the northeast monsoon bringing cleaner air. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor activity during the dry season and periods of stagnant air. Monitoring local weather patterns and avoiding peak traffic hours are crucial for mitigating exposure.