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Vilāngudi, a town in the Sivaganga district of Tamil Nadu, India, occupies a relatively flat, low-lying terrain at approximately 9.95°N latitude and 78.09°E longitude. The surrounding landscape is predominantly agricultural, characterized by paddy fields and dryland farming, typical of the region’s semi-arid climate. Situated inland, Vilāngudi isn’t directly influenced by coastal breezes, though its proximity to the Gulf of Mannar (roughly 60km east) contributes to humidity levels. The town’s position within the broader Cauvery Delta region means it benefits from alluvial soil, supporting intensive agriculture. However, this also implies significant use of fertilizers and pesticides, potentially impacting air quality through ammonia emissions and particulate matter from field preparation. The urban-rural gradient is pronounced; Vilāngudi serves as a market and service centre for surrounding villages, leading to increased vehicular traffic. While not a major industrial hub itself, its connectivity to larger industrial zones in Madurai and Ramanathapuram (within a 100km radius) means it can experience transboundary pollution. The terrain’s flatness limits natural dispersion of pollutants, exacerbating localised air quality issues, particularly during calm weather conditions. Dust from unpaved roads and agricultural activities is a consistent contributor to particulate matter levels.

Vilāngudi experiences a tropical climate with distinct wet and dry seasons heavily influencing air quality. The dry season, from February to May, sees a peak in particulate matter due to dust from agricultural activities, road construction, and generally drier conditions. High temperatures and stable atmospheric conditions during these months can trap pollutants, leading to reduced air quality. The southwest monsoon arrives in June, bringing relief from the heat and washing away some pollutants, resulting in temporarily improved air quality. However, increased humidity can also foster fungal growth, impacting respiratory health. The northeast monsoon, from October to December, is the primary rainfall season, offering the most significant cleansing effect, though heavy rainfall can also lead to localised flooding and the spread of waterborne pollutants. January is generally the clearest month, with cooler temperatures and drier air. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor activity during the peak dry season (March-May) and be mindful of potential mould exposure during the monsoon months. Fog, though infrequent, can exacerbate pollution episodes in cooler months by trapping pollutants near the ground.