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Manamelkudi, a coastal town in the Pudukkottai district of Tamil Nadu, India, occupies a low-lying position near the Bay of Bengal (coordinates 10.0419°N, 79.2300°E). Its geography is fundamentally shaped by its proximity to the sea, characterized by flat, alluvial plains formed by the confluence of several small rivers and streams draining into the Gulf of Mannar. The terrain is predominantly agricultural, with extensive paddy fields and coconut groves dominating the landscape. Manamelkudi’s urban character is that of a small, developing town, serving as a market and service centre for the surrounding rural communities. The surrounding landscape is a mix of agricultural land, interspersed with patches of scrubland and coastal vegetation. The elevation is minimal, making the area susceptible to tidal influences and storm surges. While not directly within a major industrial belt, the broader region experiences industrial activity related to salt production and fisheries. The urban-rural gradient is sharp, with a rapid transition from densely populated town centre to agricultural fields. This coastal location, combined with agricultural practices and potential for localized industrial emissions, significantly influences the town’s air quality, making it vulnerable to both marine aerosols and land-based pollutants. The prevailing winds, often influenced by the sea breeze, play a crucial role in dispersing or concentrating these pollutants.

Manamelkudi experiences a tropical climate with distinct wet and dry seasons, profoundly impacting air quality. The northeast monsoon, from October to December, brings heavy rainfall, which temporarily improves air quality by washing away particulate matter. However, increased humidity can also foster mold growth, impacting respiratory health. January to March is relatively dry and cool, with generally better air quality, though dust from agricultural activities can become noticeable. The pre-monsoon months of April and May are the most challenging. Rising temperatures create stable atmospheric conditions, often leading to temperature inversions that trap pollutants near the ground. This period sees a peak in dust and biomass burning from agricultural residue, exacerbating air quality issues. June to September, the southwest monsoon period, offers some respite, but localized flooding can contribute to dampness and mold. For those with respiratory sensitivities, avoiding outdoor activity during the hot, dry months of April and May is advisable. The monsoon season, while bringing cleaner air, requires caution due to increased humidity and potential for waterborne diseases. Monitoring local weather patterns and avoiding peak pollution times are crucial for maintaining health.