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Srīvilliputtūr, nestled in the Virudhunagar district of Tamil Nadu, India, occupies a geographically significant position within the southern Indian landscape. Located at approximately 9.5120° N latitude and 77.6330° E longitude, the town sits at an elevation of roughly 118 meters (387 feet) above sea level. Its terrain is characterized by undulating plains and gently sloping hills, part of the larger Western Ghats foothills, influencing local wind patterns and drainage. The surrounding landscape is predominantly rural, a mosaic of agricultural fields cultivating crops like rice, sugarcane, and pulses, interspersed with scrubland and scattered groves of trees. This agricultural activity, while vital to the local economy, contributes to seasonal particulate matter. Srīvilliputtūr’s proximity to the Vaigai River, though not directly adjacent, influences regional humidity and can impact atmospheric stability. The urban–rural gradient is relatively sharp; the town transitions quickly from built-up areas to agricultural zones. While not directly within a major industrial belt, Srīvilliputtūr serves as a regional trading hub, with vehicular traffic contributing to localized air pollution. The town’s location within a relatively enclosed valley can exacerbate the trapping of pollutants, particularly during periods of low wind speed. The prevailing winds, generally southwesterly, bring moisture from the Arabian Sea, but also potentially carry pollutants from more industrialized areas further west. The topography and surrounding land use patterns collectively shape the city’s air quality profile, creating a unique interplay of natural and anthropogenic influences.

Srīvilliputtūr experiences a tropical wet-dry climate, significantly impacting its air quality throughout the year. The monsoon season, typically from June to September, brings relief from accumulated pollutants as heavy rainfall washes away particulate matter and increases atmospheric ventilation. However, the preceding summer months (March-May) often witness a concerning rise in air pollution. High temperatures and reduced rainfall create stable atmospheric conditions, frequently leading to temperature inversions where cooler air is trapped beneath a layer of warmer air, preventing pollutants from dispersing. This stagnation, coupled with agricultural burning practices in surrounding rural areas, contributes to elevated levels of smoke and particulate matter. The post-monsoon season (October-November) sees a gradual improvement as winds pick up and temperatures begin to cool. The dry season (December-February) can be variable; while generally cleaner than the summer, periods of fog, particularly in December and January, can trap pollutants close to the ground, reducing visibility and impacting air quality. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the summer months and on foggy days, limiting outdoor exertion and ensuring adequate ventilation. Agricultural workers are particularly vulnerable during the burning season and should utilize appropriate respiratory protection. Maintaining green spaces within the town and promoting cleaner transportation options are crucial for mitigating seasonal pollution peaks and safeguarding public health. The interplay of monsoon patterns, temperature fluctuations, and agricultural practices dictates the annual cycle of air quality in Srīvilliputtūr.