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Ettaiyāpuram, a municipality in the Sivaganga district of Tamil Nadu, India, occupies a relatively flat terrain at approximately 9.1474°N latitude and 77.9928°E longitude. The city’s geography is characteristic of the broader Tamil Nadu plains, a region historically shaped by the Kaveri River delta, though Ettaiyāpuram itself isn’t directly on the river. It’s situated within an agricultural heartland, primarily cultivating rice, sugarcane, and groundnuts. This intensive agricultural activity, while economically vital, contributes to air quality concerns through seasonal biomass burning and fertilizer use. The surrounding landscape is predominantly rural, transitioning to denser settlements as one moves towards larger regional hubs like Madurai and Karaikudi. The urban-rural gradient is fairly sharp, with Ettaiyāpuram serving as a market and service centre for surrounding villages. While not a major industrial centre, the presence of small-scale brick kilns and agricultural processing units within and around the municipality adds to localised pollution sources. The coastal proximity, approximately 60km from the Palk Strait, introduces sea breezes that can offer some dispersion, but also potentially transport saline aerosols. The relatively low elevation limits atmospheric mixing, potentially exacerbating pollution episodes during calm weather conditions. Understanding this interplay of agricultural practices, limited industrial activity, and regional climate is crucial for assessing and mitigating air quality challenges in Ettaiyāpuram.

Ettaiyāpuram experiences a tropical climate with distinct wet and dry seasons heavily influencing air quality. The dry season, roughly from February to May, sees a build-up of particulate matter due to dust from agricultural fields and increased reliance on biomass burning for cooking and heating. Hot, dry winds exacerbate these conditions, leading to poorer air quality. May is typically the least favourable month for outdoor activity, particularly for those with respiratory sensitivities. The southwest monsoon arrives in June, bringing relief from the heat and washing away much of the accumulated dust. However, increased humidity can also trap pollutants closer to the ground. The monsoon season, lasting until September, generally offers improved air quality, though localised flooding can disrupt waste management and contribute to microbial pollutants. October to November sees a transitional period with calmer winds and a gradual return to drier conditions. November and December are generally the most pleasant months for outdoor activity. Temperature inversions, common during the cooler months, can trap pollutants near the surface, especially in the early morning. Sensitive groups – children, the elderly, and those with pre-existing respiratory conditions – should limit strenuous outdoor activity during these periods and monitor their health closely.