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Puttalam, a small town in Tamil Nadu, India (8.0981°N, 77.4640°E), occupies a relatively flat coastal plain. With a population of approximately 15,622, it’s situated within the larger Ramanathapuram district, a region characterised by arid and semi-arid conditions. The terrain is predominantly low-lying, rarely exceeding 10 meters above sea level, making it highly susceptible to coastal influences. Puttalam’s proximity to the Palk Strait, a narrow waterway separating India and Sri Lanka, is a defining geographical feature. This coastal location dictates a strong maritime climate, with high humidity and moderate temperatures for much of the year. The surrounding landscape is a mix of scrubland, palmyra palm groves, and agricultural fields, primarily focused on rain-fed agriculture. While not a major industrial hub, Puttalam serves as a local market centre for the surrounding rural areas. The urban-rural gradient is quite sharp; the town itself is compact, quickly transitioning into agricultural land. Air quality is significantly impacted by its coastal position, as sea breezes can both disperse and concentrate pollutants depending on prevailing wind patterns and regional emissions sources. Dust from agricultural activities and potential salt spray contribute to the particulate matter composition. The lack of significant elevation hinders pollutant dispersion, potentially leading to localised build-ups.

Puttalam’s air quality follows a pattern dictated by the monsoon seasons and prevailing winds. The northeast monsoon, from October to December, brings increased rainfall which temporarily improves air quality by washing away particulate matter. However, the increased humidity can also exacerbate the effects of certain pollutants. The hottest months, March to May, see a build-up of dust and pollutants due to dry conditions and stagnant air. This period is generally the least favourable for outdoor activity, particularly for those with respiratory conditions. The southwest monsoon, arriving in June, offers a brief respite, but can also bring increased moisture and potential for fungal spores. Post-monsoon, from September to November, sees a gradual deterioration in air quality as dust accumulates. Temperature inversions, common during cooler months, can trap pollutants near the ground, worsening conditions. Fog, prevalent during the cooler months, can also contribute to increased particulate matter concentrations. Sensitive groups – children, the elderly, and those with pre-existing respiratory or cardiovascular illnesses – should limit strenuous outdoor activity during the hot, dry season and periods of stagnant air. Monitoring local weather patterns and avoiding peak traffic hours can further mitigate exposure.