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Mūlaikkaraippatti, a small town in Tamil Nadu, India, rests at coordinates 8.5454°N, 77.7679°E, and supports a population of approximately 12,859. Geographically, the town is situated within the fertile plains of the state, a relatively flat terrain characteristic of the coastal regions of Tamil Nadu. This low elevation contributes to limited natural dispersion of pollutants. The surrounding landscape is predominantly agricultural, with rice paddies and coconut groves dominating the visual expanse. The town’s proximity to the Gulf of Mannar, approximately 30-40km east, introduces a maritime influence, but also potential for salt spray and humidity impacting pollutant behaviour. While not directly within a major industrial belt, the broader Thoothukudi district, of which Mūlaikkaraippatti is a part, experiences industrial activity related to port operations and chemical manufacturing. The urban-rural gradient is pronounced; the town itself is a concentrated settlement amidst a largely agrarian backdrop. Dust from agricultural practices, particularly during harvest seasons, is a significant local source of particulate matter. Roadside dust resuspension from unpaved roads and vehicle traffic further exacerbates the issue. The lack of substantial green cover within the town limits limits the natural filtration of airborne pollutants, making Mūlaikkaraippatti particularly vulnerable to air quality fluctuations.

Mūlaikkaraippatti experiences a tropical climate with distinct wet and dry seasons heavily influencing air quality. The dry season, from February to May, sees a build-up of particulate matter due to increased dust from agricultural activities and drier conditions facilitating resuspension from roads. High temperatures during these months can also contribute to the formation of ground-level ozone. The southwest monsoon, arriving in June and lasting through September, initially offers a respite with rainfall washing away pollutants. However, increased humidity can also promote the formation of secondary pollutants. October and November, during the northeast monsoon, often bring heavy rainfall and improved air quality, though localised flooding can disrupt traffic and increase diesel vehicle emissions. December and January are generally the most favourable months for outdoor activity, with cooler temperatures and relatively lower pollution levels. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor exposure during the peak of the dry season (March-May) and periods of high humidity. Fog, common during the cooler months, can trap pollutants near the ground, worsening localised air quality. Avoiding peak traffic hours is advisable year-round.