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Srīmushnam, a town in the Cuddalore district of Tamil Nadu, India, occupies a relatively flat coastal plain, situated approximately 25km inland from the Bay of Bengal. Its coordinates (11.4012° N, 79.4038° E) place it within a tropical climate zone, characterized by warm temperatures and distinct wet and dry seasons. The surrounding landscape is predominantly agricultural, dominated by rice paddies and coconut groves, interspersed with pockets of cashew and other fruit cultivation. The terrain is gently undulating, gradually sloping towards the coast. While not directly on the shoreline, Srīmushnam’s proximity to the Bay of Bengal introduces significant humidity and influences local wind patterns. The town’s urban character is that of a small, developing settlement, with a population of around 15,829, exhibiting a clear urban-rural gradient as it transitions into the surrounding agricultural areas. There are no major industrial belts *within* Srīmushnam itself, however, the broader Cuddalore district hosts some industrial activity, including chemical and petrochemical plants, which can contribute to regional air pollution transported by prevailing winds. The lack of significant topographical features allows for limited natural dispersion of pollutants, potentially exacerbating air quality issues during stagnant weather conditions. The coastal influence also means potential for salt spray and associated aerosol formation, impacting particulate matter composition.

Srīmushnam experiences a distinct wet and dry season cycle that profoundly impacts air quality. The dry season, roughly from January to May, sees a build-up of particulate matter due to reduced rainfall and increased dust from agricultural activities. Hot, dry winds can carry pollutants from surrounding areas, and temperature inversions, common during the calmer mornings, trap pollutants near ground level. February and March are typically the months with the poorest air quality. The arrival of the southwest monsoon in June brings relief, washing away pollutants and improving air quality significantly. However, increased humidity can also promote the formation of secondary pollutants. September and October, following the monsoon’s retreat, can see a resurgence of stagnant air and localised pollution from biomass burning associated with agricultural practices. November to December offers the most favourable conditions, with cooler temperatures, moderate rainfall, and consistent breezes aiding dispersion. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor activity during the peak of the dry season (February-March) and be mindful of potential post-monsoon pollution (September-October). Monitoring local conditions and using appropriate respiratory protection is advised.