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Ahmadnagar, situated in the heart of Maharashtra's Deccan Plateau at coordinates 19.0800°N, 74.7300°E, occupies a strategic position approximately 120 kilometres northeast of Pune and 250 kilometres east of Mumbai. The city rests at an elevation of around 650 metres above sea level, nestled within the undulating terrain of the Western Ghats' rain-shadow region, which significantly shapes its climatic and air quality patterns. Ahmadnagar's urban character blends historical fortifications with modern expansion, creating a distinct urban-rural gradient where the compact city centre transitions into extensive agricultural hinterlands. The surrounding landscape is dominated by semi-arid plains and scattered hills, with the Sina River flowing nearby, though its seasonal nature limits substantial water body influence on local meteorology. Proximity to major industrial belts, particularly the Pune-Nashik industrial corridor to the west, introduces transported pollutants via prevailing winds, while local sources include vehicular emissions from the city's growing population of 350,859 and biomass burning from adjacent agricultural zones. The region's topography, with hills to the west, can occasionally trap pollutants under stable atmospheric conditions, especially during cooler months. Agricultural activities in the surrounding rural areas, including sugarcane processing and crop residue burning, contribute particulate matter, creating a complex airshed where urban and rural pollution sources interact across the Deccan Plateau's distinctive terrain.

Ahmadnagar's air quality follows a pronounced seasonal rhythm shaped by the interplay of monsoon systems and regional meteorology. During winter (December-February), cooler temperatures and frequent temperature inversions trap pollutants close to the ground, leading to elevated particulate levels, especially in mornings when fog can exacerbate visibility issues; this period poses the highest risk for sensitive groups like asthmatics and the elderly, who should limit outdoor activities during early hours. Spring (March-May) sees increasing temperatures and pre-monsoon dust storms that lift fine particles from the arid landscape, though occasional thunderstorms provide temporary cleansing. The summer monsoon (June-September) brings substantial relief as heavy rains from the southwest monsoon wash pollutants from the atmosphere, resulting in the year's cleanest air, ideal for outdoor pursuits; however, high humidity can occasionally heighten allergen dispersal. Post-monsoon (October-November) marks a transitional phase where retreating rains give way to stagnant conditions and agricultural burning, gradually deteriorating air quality ahead of winter peaks. Sensitive individuals should monitor local advisories particularly from November to February, favouring indoor exercise during pollution episodes, while the monsoon months offer the safest window for sustained outdoor activity, leveraging the region's natural atmospheric cleansing.