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Nestled in the Tiruvannamalai district of northern Tamil Nadu, Arani occupies a strategic position within the broader Chennai-Bengaluru industrial corridor, approximately 120 kilometers southwest of Chennai. The town's geography is characterized by the gently undulating terrain of the Eastern Coastal Plains, with an average elevation of around 150 meters above sea level, which subtly influences local air circulation patterns. Situated inland from the Bay of Bengal, Arani lacks the moderating maritime influence that coastal cities enjoy, making it more susceptible to temperature extremes and stagnant air conditions that trap pollutants. The surrounding landscape transitions from the town's urban core through peri-urban silk weaving clusters into agricultural zones dominated by paddy fields and coconut groves, creating a distinct urban-rural gradient where industrial emissions from textile processing and dyeing units intermix with agricultural residue burning and residential biomass combustion. This geographic positioning within Tamil Nadu's textile belt, combined with its location downwind of Chennai's industrial sprawl during certain seasonal wind patterns, exacerbates air quality challenges. The town's proximity to the Palar River basin, though often seasonal in flow, contributes to both flooding risks and dust generation during dry periods, while the absence of significant topographic barriers allows pollutants to accumulate rather than disperse efficiently.

Arani's air quality follows a distinct seasonal rhythm shaped by its tropical wet-and-dry climate and regional meteorological patterns. During the northeast monsoon season from October to December, reduced wind speeds and frequent temperature inversions create stagnant atmospheric conditions that trap pollutants from silk weaving, vehicular emissions, and construction dust, leading to the peak pollution months of November through February. This period coincides with increased biomass burning for heating and festive activities, compounding particulate matter concentrations. The winter months particularly see dense morning fog that mixes with pollutants to form harmful smog, making early mornings hazardous for outdoor exercise, especially for those with respiratory conditions. From March to May, extreme heat intensifies photochemical reactions, elevating ground-level ozone despite some pollutant dispersion through convective afternoon breezes. The southwest monsoon from June to September brings cleansing rains that wash away particulate matter, offering the cleanest air of the year, though high humidity can exacerbate respiratory distress for some. Sensitive groups including children, elderly residents, and those with pre-existing heart or lung conditions should minimize outdoor exposure during morning and evening hours in peak pollution months, while the post-monsoon period from late September to early October typically offers the most favorable conditions for outdoor activities before winter stagnation sets in.