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Wāris Alīganj, nestled in the fertile plains of Bihar, India, occupies a geographically significant position within the Ganges River basin. Located at approximately 25.01°N, 85.63°E, the town’s terrain is predominantly flat, characteristic of the Indo-Gangetic Plain. Its elevation is relatively low, contributing to atmospheric stability and potential for pollutant accumulation. The surrounding landscape is a mosaic of agricultural fields – primarily rice and wheat cultivation – interspersed with small villages and scattered groves of trees. This intensive agricultural activity, while vital for the regional economy, contributes to seasonal particulate matter pollution through crop residue burning, a common practice after harvest. Wāris Alīganj sits within a gradual urban–rural gradient, transitioning from the denser population centers of Patna, roughly 80 kilometers to the northeast, towards more sparsely populated rural areas. The proximity to the Ganges River, though providing a crucial water source, can also influence local weather patterns and, under certain conditions, exacerbate air pollution episodes. The town’s location within a broad, relatively enclosed plain limits effective dispersion of pollutants, particularly during periods of stagnant air. Industrial activity in the broader region, including small-scale manufacturing and processing units, further adds to the potential for localized air quality degradation. The flat topography and prevailing wind patterns often trap pollutants, creating a microclimate susceptible to poor air quality, especially during cooler months.

Wāris Alīganj’s air quality follows a distinct seasonal pattern dictated by the region’s monsoon climate. The monsoon season, typically spanning June to September, brings relief from accumulated pollutants due to frequent rainfall and increased wind speeds, effectively flushing the atmosphere. However, even during this period, localized pollution from agricultural practices can persist. The transition months of October and November are often the most challenging. Following the harvest season, widespread crop residue burning significantly elevates particulate matter concentrations, creating a period of consistently poorer air quality. Temperature inversions, common during these cooler months, trap pollutants near the ground, exacerbating the situation. December and January are typically the coldest months, with frequent fog episodes that further restrict atmospheric mixing and worsen air quality. The reduced sunlight and stagnant air conditions during these months contribute to a build-up of pollutants. As temperatures rise in March and April, the intensity of crop residue burning gradually decreases, and wind speeds increase, leading to a gradual improvement in air quality. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the October-November and December-January periods, limiting outdoor exertion and considering the use of air filtration devices. During the monsoon, while generally better, those with allergies should remain vigilant regarding pollen and mold counts.