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Tāmaraikkulam, a small town in Tamil Nadu, India, is situated at coordinates 10.1085°N, 77.5553°E, placing it within the fertile Cauvery Delta region. The terrain is predominantly flat, characteristic of alluvial plains formed by the river system, with an elevation hovering around a few meters above sea level. This low-lying geography contributes to limited natural dispersion of pollutants. The town’s population of approximately 13,716 reflects a largely rural character, though increasing connectivity is driving urbanisation. Surrounding Tāmaraikkulam are extensive agricultural lands, primarily dedicated to paddy cultivation, alongside coconut groves and other tropical crops. While not directly within a major industrial belt, the broader Thanjavur district, of which Tāmaraikkulam is a part, experiences agricultural processing and smaller-scale manufacturing. The proximity to the Bay of Bengal introduces humidity and influences local wind patterns. The urban-rural gradient is relatively sharp, with surrounding villages maintaining a strong agricultural focus. This mix of agricultural practices, potential for localised industrial emissions, and flat topography creates a unique set of conditions impacting air quality. Dust from agricultural activities, particularly during harvest seasons, is a significant factor, alongside emissions from transport and domestic fuel burning.

Tāmaraikkulam experiences a tropical climate with distinct wet and dry seasons, heavily influencing air quality. The dry season, roughly from January to May, sees a build-up of particulate matter due to reduced rainfall and increased dust from agricultural fields preparing for sowing. Temperatures rise, potentially leading to localised temperature inversions trapping pollutants near the ground. March and April are typically the months with the poorest air quality. The southwest monsoon arrives in June, bringing significant rainfall that washes away pollutants, dramatically improving air quality. However, increased humidity can also foster mould growth, impacting respiratory health. September and October see a transition period, with receding monsoon rains and a potential for stagnant air. The northeast monsoon, from October to December, brings further rainfall, again cleansing the air, but also increasing the risk of flooding and waterborne diseases. November and December generally offer the most favourable conditions for outdoor activity. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor exposure during the peak of the dry season and monitor conditions closely during monsoon transitions. Avoiding peak traffic hours and using masks when dust levels are high are recommended.