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Sheikhpura, a modest urban center in Bihar's agricultural heartland, occupies a strategic position within India's Gangetic Plain at coordinates 25.1400°N, 85.8400°E. Situated approximately 100 kilometers southeast of Patna, the state capital, this town of 36,000 residents lies at a low elevation of about 53 meters above sea level, characteristic of the flat alluvial terrain that defines this region. The landscape surrounding Sheikhpura consists predominantly of fertile agricultural fields interspersed with scattered settlements, creating a distinct urban-rural gradient where the town serves as a local administrative and commercial hub. Proximity to the Ganges River basin, approximately 40 kilometers to the north, influences local humidity patterns while contributing to the area's agricultural productivity. This geographic setting places Sheikhpura within Bihar's intensive agricultural zone, where rice and wheat cultivation dominate the rural economy. The town's location in the densely populated Indo-Gangetic Plain exacerbates air quality challenges, as emissions from local sources combine with regional pollution transported by prevailing winds. The flat topography inhibits natural ventilation, allowing pollutants to accumulate, particularly during winter months when temperature inversions become frequent. Road networks connecting Sheikhpura to larger urban centers like Patna and Gaya contribute to vehicular emissions, while the surrounding agricultural landscape ensures that biomass burning remains a persistent pollution source throughout the year.

Sheikhpura's air quality follows a distinct seasonal rhythm shaped by its humid subtropical climate and agricultural calendar. During winter (October-January), pollution reaches its peak as multiple factors converge: agricultural residue burning after the kharif harvest releases massive particulate matter, domestic biomass burning for heating increases, and meteorological conditions become particularly unfavorable. Cold temperatures create frequent temperature inversions that trap pollutants near the surface, while dense morning fog—common in the Gangetic Plain—combines with smoke to form toxic smog. These months present the highest health risks, with sensitive groups like children, elderly, and those with respiratory conditions advised to limit outdoor activities, especially during early mornings when pollution concentrations peak. Spring (February-March) brings gradual improvement as temperatures rise and inversion layers weaken, though occasional dust storms from the Thar Desert can temporarily degrade air quality. The summer monsoon (June-September) provides dramatic relief as heavy rainfall effectively scrubs pollutants from the atmosphere, and strong southwesterly winds disperse remaining contaminants. This period offers the best conditions for outdoor activities, though extreme heat in May-June requires precautions against heat-related illnesses. Post-monsoon (October) marks the transition back to hazardous conditions as agricultural burning commences and meteorological factors again become unfavorable, completing the annual cycle that makes Sheikhpura's air quality among the most seasonally variable in South Asia.