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Nestled in the Krishnagiri district of Tamil Nadu, India, Krishnagiri city occupies a strategic position at the crossroads of major transportation routes, most notably National Highway 44, which connects it to major urban centers like Bengaluru and Chennai. Situated at an elevation of approximately 500 meters above sea level, the city lies within the Eastern Ghats' foothills, characterized by undulating terrain and rocky outcrops that dominate the landscape. This topography, combined with the region's tropical wet-and-dry climate, creates a unique microclimate that significantly influences air quality. The city is surrounded by extensive agricultural zones, primarily mango orchards and other horticultural crops, which contribute to seasonal agricultural burning and pesticide drift. Proximity to the Ponnaiyar River and several smaller water bodies provides some moisture but does little to mitigate pollution due to the area's generally low humidity outside the monsoon season. The urban-rural gradient is pronounced, with the city core experiencing higher pollution from vehicular emissions and construction activities, while the outskirts are affected by granite quarrying and processing industries that release substantial particulate matter. The city's location in an industrial belt, coupled with its role as a regional trade hub, exacerbates air quality issues, as pollutants from both local and transboundary sources accumulate in the valley-like terrain, leading to frequent temperature inversions that trap contaminants near the ground.

Krishnagiri's air quality follows a distinct seasonal pattern driven by its tropical wet-and-dry climate and local emission sources. During the winter months from November to February, pollution peaks due to a combination of meteorological factors and human activities. Cooler temperatures and calm winds create frequent temperature inversions that trap pollutants from granite quarrying, vehicular emissions on NH-44, and diesel generators near the surface. Additionally, reduced rainfall and occasional fog exacerbate particulate matter accumulation, making these months particularly hazardous for outdoor activities, especially for sensitive groups like children, the elderly, and those with respiratory conditions. The summer season from March to May sees extreme heat that increases ozone formation from vehicular and industrial emissions, though occasional thunderstorms provide temporary relief by dispersing pollutants. The southwest monsoon from June to September brings substantial rainfall that washes away particulate matter, leading to the cleanest air of the year, making this period favourable for outdoor activities. However, post-monsoon months from October onward witness a rapid deterioration in air quality as agricultural burning, increased construction activity, and the return of stable atmospheric conditions converge. Residents are advised to monitor local air quality reports, use air purifiers indoors during peak pollution months, and schedule outdoor exercises during early mornings or after rainfall when pollutant levels are lower.