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Singampunari, a small town in Tamil Nadu, India, sits at coordinates 10.1815°N, 78.4231°E, within the fertile Cauvery Delta region. The terrain is predominantly flat, characteristic of alluvial plains formed by the river’s deposition over millennia. This low-lying landscape, with an elevation generally under 50 meters, influences air dispersion patterns, often limiting vertical mixing and potentially trapping pollutants. Singampunari is surrounded by intensely cultivated agricultural land, primarily paddy fields, and interspersed with coconut groves and other tropical crops. The town’s proximity to the Cauvery River provides irrigation but also contributes to high humidity levels, impacting pollutant chemistry. While not a major industrial hub itself, Singampunari is situated within a region experiencing increasing industrial activity in nearby towns like Tiruchirappalli and Thanjavur, creating a potential for regional pollutant transport. The urban-rural gradient is relatively sharp; the town itself is compact, quickly transitioning to agricultural fields. This proximity to agricultural practices introduces sources like biomass burning (post-harvest) and fertilizer application, impacting local air quality. The delta’s flat topography and limited natural barriers mean wind patterns play a crucial role in pollutant dispersal, with seasonal monsoon winds being particularly influential.

Singampunari experiences a tropical climate with distinct wet and dry seasons, profoundly influencing air quality. The dry season, roughly from February to May, sees increasing dust levels due to drier soil conditions and agricultural activities. Temperatures rise, potentially leading to temperature inversions that trap pollutants near the ground. March and April are typically the least favourable months for outdoor activity for those with respiratory sensitivities. The southwest monsoon arrives in June, bringing relief from the heat and washing away accumulated pollutants, resulting in improved air quality. However, increased humidity can also promote secondary pollutant formation. The northeast monsoon, from October to December, is the primary rainfall season, further cleansing the air, but also increasing the risk of fungal spores and dampness-related respiratory issues. November and December generally offer the best air quality. Post-monsoon, from January to February, sees a gradual build-up of pollutants as rainfall decreases and agricultural burning increases. Sensitive groups – children, the elderly, and those with pre-existing respiratory conditions – should limit strenuous outdoor activity during the dry season and be mindful of potential allergen spikes post-monsoon.