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Peravurani is a small agricultural town situated in the Thanjavur district of Tamil Nadu, India, positioned at coordinates 10.2902°N, 79.2004°E within the fertile Cauvery Delta region. This low-lying settlement rests at an elevation of approximately 10 meters above sea level, characterized by flat alluvial plains that stretch across the landscape, interspersed with irrigation canals and water bodies. The town's proximity to the Bay of Bengal, about 40 kilometers to the east, influences its tropical wet-and-dry climate while creating a coastal-inland transition zone that affects pollution dispersion patterns. Peravurani exists within a predominantly rural agricultural belt, surrounded by extensive paddy fields, coconut groves, and salt pans along the coastal fringes, creating an urban-rural gradient where the town itself serves as a minor commercial hub amidst vast farming communities. This geographic positioning directly impacts air quality through multiple pathways: agricultural burning emissions from surrounding fields become trapped in the stable atmospheric conditions of the delta basin, salt pan operations along the coast contribute marine-influenced particulate matter, and the flat terrain offers little topographic relief to facilitate pollutant dispersion. The town's location within India's rice bowl region means agricultural activities dominate the landscape, with rice processing facilities and biomass combustion for domestic energy adding to the pollution burden, while unpaved rural roads generate significant dust that affects the entire area.

Peravurani experiences distinct seasonal air quality patterns driven by its tropical wet-and-dry climate and agricultural calendar. During the northeast monsoon season from October to December, pollution begins to escalate as post-harvest agricultural burning coincides with reduced wind speeds and frequent temperature inversions that trap pollutants near the surface. The peak pollution months of November through February represent the worst air quality period, when calm winds, cooler nighttime temperatures, and morning fog combine with intensive biomass combustion from farming activities to create hazardous conditions. Sensitive groups including children, elderly residents, and those with respiratory conditions should minimize outdoor exposure during these months, particularly in early mornings when pollution concentrations are highest. The summer months from March to May bring some relief through increased sea breezes from the Bay of Bengal, though extreme heat can exacerbate ozone formation and dust resuspension remains problematic. The southwest monsoon from June to September provides the cleanest air of the year, as heavy rainfall effectively scrubs pollutants from the atmosphere while agricultural activities are minimal. However, this period brings its own challenges with flooding hazards that can temporarily affect air quality through mold spores and dampness-related issues. For optimal outdoor activity, the early monsoon months of June and July offer the best balance of cleaner air and manageable weather, though cyclone threats must be monitored during this transitional period.