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Krishnarājāsāgara is situated in the heart of the Mysore district, defined by its symbiotic relationship with the majestic Kaveri River and the sprawling Krishnaraja Sagara reservoir. Positioned on the semi-arid Deccan Plateau, the town's urban character is a blend of administrative utility and agrarian vitality, serving as a critical hub for irrigation management in Southern Karnataka. The terrain is predominantly flat with gentle undulations, characterized by red loamy soils that support intensive agriculture. This specific location significantly influences its air quality profile; the vast expanse of the reservoir acts as a natural heat sink, modulating local temperatures and introducing moisture that can scrub particulate matter from the lower atmosphere. However, the surrounding landscape is a patchwork of sugarcane and paddy fields, creating a distinct urban–rural gradient. The proximity to these agricultural zones introduces seasonal pollutants, particularly during harvest periods when biomass burning is prevalent. Unlike the dense industrial belts of Bengaluru, Krishnarājāsāgara lacks heavy manufacturing, meaning its air quality is dictated more by biological and meteorological factors than industrial emissions. The town's relatively low elevation and open topography allow for generally good ventilation, yet the interaction between the cool waters of the dam and the warming land can create localized microclimates. These conditions occasionally trap surface-level pollutants during the early morning hours, particularly when wind speeds drop, making the immediate riparian zone a focal point for atmospheric study and regional environmental management and conservation.

The air quality narrative of Krishnarājāsāgara is dictated by the rhythmic cycle of the South West and North East monsoons. During the wet season, from June to September, the atmosphere is scrubbed clean by heavy precipitation, leading to the lowest pollutant concentrations of the year. This period is ideal for outdoor activities, as rain effectively washes away suspended particulate matter. As the region transitions into the post-monsoon autumn, air quality begins to shift. October and November often see a rise in pollutants due to the burning of crop residues in the surrounding agricultural hinterland, creating a seasonal haze. The winter months, from December to February, present the most challenging conditions. Cool temperatures lead to nocturnal temperature inversions, where a layer of warm air traps cooler, pollutant-heavy air near the ground. Morning fog often exacerbates this, trapping smoke from domestic heating and vehicle exhausts, making these months precarious for children and the elderly. Finally, the pre-monsoon summer, from March to May, is characterized by high temperatures and increased wind speeds. While the wind helps disperse pollutants, the dry terrain leads to a surge in mineral dust and airborne soil particles. Sensitive groups should limit outdoor exertion during the peak heat of April and May to avoid respiratory irritation. Overall, the town experiences a cyclical pattern where the purity of the monsoon rains contrasts with the stagnant, dusty air of the late winter and early summer transitions.