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Mathura, situated in Uttar Pradesh's Braj region along the Yamuna River's western banks, occupies a strategic position within India's agriculturally intensive Gangetic Plain. The city's elevation of approximately 174 meters above sea level places it on relatively flat alluvial terrain, characterized by fertile soils that support extensive wheat and mustard cultivation in surrounding rural areas. This urban-rural gradient creates a complex pollution dynamic where agricultural burning from nearby fields interacts with urban emissions. Mathura's location within the National Capital Region's industrial corridor amplifies its air quality challenges—the Mathura Oil Refinery, one of India's largest, operates just 10 kilometers south, while the city serves as a transportation node connecting Delhi to Agra and Rajasthan. The Yamuna River, while providing cultural significance, offers minimal moderating effect on pollution dispersion due to its seasonal flow variations. Positioned approximately 150 kilometers southeast of Delhi, Mathura experiences regional pollution transport from the megacity's industrial and vehicular emissions, particularly during winter when northwesterly winds prevail. The surrounding landscape lacks significant topographic barriers, allowing pollutants to accumulate under stagnant atmospheric conditions, while the city's expansion into peri-urban zones creates a mosaic of emission sources from brick kilns, unpaved roads, and increasing vehicular traffic from pilgrim tourism.

Mathura's air quality follows a pronounced seasonal rhythm dictated by its humid subtropical climate and regional meteorological patterns. Winter months from October through January represent the peak pollution period, when cold temperatures combine with frequent temperature inversions that trap pollutants near the surface. Dense fog episodes, common in December and January, further exacerbate particulate matter concentrations by enhancing aerosol formation and reducing dispersion. These months should be avoided by sensitive groups like asthmatics and elderly residents, who should limit outdoor activities and use air purifiers indoors. Spring brings gradual improvement as temperatures rise and inversion layers weaken, though March may still experience elevated pollution from agricultural residue burning in surrounding fields. The summer monsoon from June to September offers the cleanest air, as southwest winds and heavy rainfall effectively scavenge pollutants from the atmosphere—this period favors outdoor activities. However, extreme heat in May and June can combine with ozone formation, posing respiratory risks during afternoon hours. Autumn sees rapid deterioration as monsoon withdrawal in October brings stagnant conditions, crop burning emissions, and the onset of festival-related pollution from Diwali fireworks and increased pilgrim traffic. Year-round, morning hours typically show higher pollution concentrations due to overnight accumulation and traffic peaks.