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Nestled in the Vellore district of northern Tamil Nadu, Ambur occupies a strategic position along the Palar River basin approximately 200 kilometers west of Chennai. This medium-sized industrial town sits at an elevation of 300 meters above sea level on the Deccan Plateau's eastern fringe, where the terrain transitions from rocky uplands to the fertile coastal plains. Ambur's urban character is defined by its dense concentration of leather tanneries along the riverbanks, creating a distinct industrial belt that dominates the local economy and landscape. The Palar River, though often seasonal and prone to drought, serves as both water source and pollution sink for tannery effluents. Surrounded by agricultural zones growing rice, sugarcane, and groundnuts, Ambur exists at a sharp urban-rural gradient where industrial emissions directly impact neighboring farmlands. Its location in the rain shadow of the Eastern Ghats contributes to temperature inversions that trap pollutants, while proximity to National Highway 46 ensures constant vehicular emissions. The town's geography—sandwiched between hills to the west and plains to the east—creates a natural basin effect that exacerbates air stagnation, particularly during the dry winter months when industrial fumes mingle with agricultural residue burning from surrounding fields.

Ambur's air quality follows a dramatic seasonal rhythm dictated by its tropical wet-and-dry climate and industrial calendar. During the northeast monsoon (October-December), reduced rainfall and temperature inversions trap chromium emissions, hydrogen sulfide, and ammonia from tanneries, creating hazardous conditions that peak from October through February. These months feature calm winds, frequent fog formation, and atmospheric stability that prevents pollutant dispersion—making them particularly dangerous for outdoor activity. Sensitive groups including children, elderly residents, and those with respiratory conditions should minimize exposure during morning hours when inversions are strongest. The summer months (March-June) bring extreme heat that accelerates chemical reactions and organic waste decomposition, though occasional thunderstorms provide temporary cleansing. The southwest monsoon (July-September) offers relative relief with consistent winds and heavy rainfall that scrub pollutants from the air, making this the optimal period for outdoor activities. However, cyclone threats during transitional months can stir up industrial dust and chemical deposits. Year-round, the town's leather processing creates persistent baseline pollution, but meteorological conditions determine when these emissions become dangerously concentrated in the breathing zone.