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Tumkūr, situated in the southeastern part of Karnataka at coordinates 13.3400°N, 77.1000°E, occupies a distinctive position in India's Deccan Plateau region. The city lies approximately 70 kilometers northwest of Bengaluru, placing it within the influential orbit of Karnataka's capital while maintaining its own urban-rural character. With an elevation of around 822 meters above sea level, Tumkūr rests on relatively flat terrain that gradually slopes toward the northeast, creating a basin-like topography that can trap pollutants under certain meteorological conditions. The city is surrounded by agricultural zones, particularly known for coconut, arceanut, and groundnut cultivation, with rural areas transitioning into urban development. This creates a complex air quality dynamic where agricultural burning during specific seasons combines with urban emissions. Tumkūr sits between the Eastern Ghats to the northeast and the Western Ghats further west, though neither mountain range directly shields the city from pollution transport. The city lacks significant natural water bodies in immediate proximity, with the Jayamangali River flowing at a distance, limiting any moderating effects on local climate. Industrial activity in Tumkūr includes small-scale manufacturing and processing units rather than heavy industry, though its position along transportation corridors connecting Bengaluru to northern Karnataka means it experiences vehicular emissions from through traffic. The urban-rural gradient sees cleaner air in surrounding villages giving way to moderate pollution in the city center, particularly along major roads and commercial areas.

Tumkūr's air quality follows distinct seasonal patterns shaped by its tropical savanna climate and regional meteorological influences. During winter (December-February), cooler temperatures and frequent temperature inversions trap pollutants close to the ground, creating the year's worst air quality conditions, particularly in January when morning fog combines with stagnant air. Sensitive groups should limit outdoor activities during early mornings in these months. The pre-monsoon period (March-May) brings rising temperatures that increase photochemical reactions, though occasional thunderstorms provide temporary cleansing; April typically sees moderate pollution levels. The southwest monsoon (June-September) dramatically improves air quality as heavy rains wash pollutants from the atmosphere, with July and August offering the cleanest air of the year—ideal for outdoor activities. However, high humidity during this period can exacerbate respiratory issues for some individuals. The post-monsoon season (October-November) sees gradually deteriorating conditions as rainfall decreases and agricultural burning in surrounding areas begins, with November marking the transition to winter pollution buildup. Wind patterns play a crucial role throughout the year: during monsoon months, prevailing winds from the southwest bring cleaner marine air, while in winter, light variable winds allow pollution accumulation. Sensitive groups including children, elderly, and those with respiratory conditions should be particularly cautious during winter mornings and the post-monsoon burning season, while generally enjoying good air quality during peak monsoon months.