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Parli Vaijnāth, nestled in the Beed district of Maharashtra, India, occupies a geographically significant position within the arid landscape of the Deccan Plateau. Located at approximately 18.85°N, 76.53°E and an elevation of around 570 meters (1,870 feet) above sea level, the city’s terrain is predominantly characterized by undulating plains and rocky outcrops, typical of the region's basaltic bedrock. The surrounding landscape is largely agricultural, dominated by rain-fed crops like jowar and groundnut, interspersed with pockets of dry deciduous forest. This agricultural activity, particularly during harvest seasons, contributes to localized particulate matter pollution. Parli Vaijnāth sits on the edge of the Marathwada region, a historically drought-prone area, limiting the influence of major water bodies. The nearest significant river, the Sina, flows some distance away, offering minimal moderating effect on the local climate. The urban–rural gradient transitions rapidly, with agricultural fields and smaller villages immediately bordering the city limits. The city’s location within a relatively enclosed basin, coupled with the prevailing wind patterns, can exacerbate the accumulation of pollutants. While not directly adjacent to major industrial belts, Parli Vaijnāth serves as a regional trading hub for agricultural produce, leading to increased vehicular traffic and associated emissions. The relatively flat topography and limited natural ventilation contribute to a susceptibility to stagnant air conditions, particularly during cooler months, impacting air quality and creating conditions ripe for pollutant build-up.

Parli Vaijnāth experiences a distinct tropical wet and dry climate, significantly influencing its air quality throughout the year. The dry season, typically spanning from October to May, is characterized by consistently high temperatures and low humidity. This period often witnesses a noticeable increase in particulate matter pollution, largely due to agricultural burning practices as farmers clear fields after harvest. Temperature inversions, common during the cooler winter months (December-January), trap pollutants near the ground, further degrading air quality. Dust storms, originating from the Thar Desert to the northwest, can also impact the city, particularly in March and April, adding to the particulate load. The monsoon season, from June to September, brings relief with increased rainfall, effectively washing away pollutants and significantly improving air quality. However, heavy rainfall can also lead to localized flooding and the release of pollutants from waterlogged areas. Fog, prevalent during the early morning hours in November and December, further reduces visibility and traps pollutants close to the ground. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, particularly during agricultural burning periods and when temperature inversions are present. Outdoor activities are generally more favourable during the monsoon months, although vigilance regarding waterborne diseases is advised. The transition periods – spring and autumn – often present a mixed picture, with improving air quality gradually overshadowed by the return of dry conditions and agricultural activities.