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Tiruverumbūr, nestled in the Kancheepuram district of Tamil Nadu, India, occupies a geographically significant position within the broader Chennai metropolitan area. Located at approximately 10.79°N latitude and 78.77°E longitude, the town sits on a relatively flat alluvial plain, a legacy of the Palar River's historical course. This terrain, characteristic of the Coromandel Coast, contributes to a generally low elevation, rarely exceeding 30 meters above sea level. The surrounding landscape is a blend of agricultural fields – predominantly rice paddies and vegetable farms – and increasingly, peri-urban development reflecting Chennai’s outward expansion. The proximity to the Bay of Bengal, roughly 20 kilometers to the east, influences local weather patterns and can, under certain conditions, introduce marine aerosols into the air. While Tiruverumbūr itself lacks major industrial zones, it’s situated within a region experiencing rapid industrial growth, with several manufacturing units and industrial estates located in nearby areas like Sriperumbudur. This proximity means that pollutants generated elsewhere can be transported into Tiruverumbūr, particularly during periods of low wind speed. The urban–rural gradient is noticeable, with the town transitioning from agricultural land to denser residential areas as it merges with the Chennai metropolitan sprawl. The flat topography and prevailing wind patterns often lead to the accumulation of pollutants, especially during calmer periods, impacting local air quality. The Palar River, though significantly reduced in flow, still influences the local microclimate and drainage patterns, potentially affecting humidity and temperature, which in turn can influence pollutant dispersion.

Tiruverumbūr’s air quality follows a distinct seasonal pattern dictated by the region’s tropical climate and the influence of the Indian monsoon. The hot, dry months of March to May typically see a gradual increase in particulate matter concentrations. This is due to increased construction activity associated with the ongoing urban expansion, combined with stagnant air masses and higher temperatures that exacerbate photochemical smog formation. Dust storms originating from inland regions can also contribute to elevated levels. The southwest monsoon, arriving in June and lasting through September, brings a significant respite. The increased rainfall effectively ‘washes’ pollutants from the atmosphere, and the stronger winds disperse accumulated emissions. However, during the initial onset of the monsoon, heavy rainfall can temporarily elevate humidity and create localized fog, which can trap pollutants near the ground. October and November mark a transitional period, with decreasing rainfall and gradually weakening winds, leading to a potential rebound in pollution levels. The cooler, drier months of December and January often experience temperature inversions, particularly during early morning hours. These inversions trap pollutants close to the ground, creating localized pockets of poor air quality. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should limit outdoor exertion during these periods, especially in the early morning. During the monsoon months, while overall air quality improves, vigilance is still needed regarding waterborne illnesses and potential mold growth in damp environments. The period from February to May requires careful monitoring of air quality forecasts and proactive measures to minimize exposure to pollutants.