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Bhainsahi, nestled in the fertile plains of Bihar, India, occupies a geographically significant position within the Gangetic Basin. Located at approximately 26.44°N, 84.54°E, the town’s terrain is predominantly flat, characteristic of the Indo-Gangetic Plain, with an elevation of roughly 55 meters above sea level. This low-lying topography contributes to a tendency for pollutants to accumulate, particularly during periods of atmospheric stability. The surrounding landscape is dominated by agricultural fields – primarily rice and wheat cultivation – which, while vital to the regional economy, can contribute to particulate matter pollution through seasonal burning practices. Bhainsahi’s proximity to the Ganges River, though offering a crucial water source, also influences local weather patterns, occasionally leading to humidity and fog, which can trap pollutants close to the ground. The urban–rural gradient around Bhainsahi is gradual; the town itself is relatively small, but it serves as a local market and transport hub for surrounding villages. While not directly adjacent to major industrial belts, it’s within reach of industrial zones in larger Bihar cities, and transportation corridors connecting them, meaning pollutants can be transported via prevailing winds. The flat, expansive nature of the region, combined with agricultural activity and connectivity to broader industrial areas, creates a complex interplay of factors impacting air quality in Bhainsahi. The lack of significant topographical features to disperse pollutants is a key challenge.

Bhainsahi’s air quality follows a distinct seasonal pattern dictated by the region’s monsoon climate. The pre-monsoon season (March-May) typically witnesses the poorest air quality. Rising temperatures and decreasing wind speeds create atmospheric stability, fostering temperature inversions that trap pollutants near the surface. Agricultural burning, a common practice to clear fields for the planting season, significantly contributes to particulate matter pollution during this period. The monsoon season (June-September) brings relief, with increased rainfall and stronger winds that naturally cleanse the atmosphere. However, heavy rainfall can also lead to waterlogging and the release of methane, a greenhouse gas. The post-monsoon season (October-November) sees a gradual return to drier conditions, and a resurgence of agricultural burning, again impacting air quality. Winter months (December-February) are often characterized by dense fog, which further restricts atmospheric mixing and traps pollutants, exacerbating the problem. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the pre-monsoon and post-monsoon seasons, limiting outdoor activity during peak pollution periods. During the fog-laden winter months, indoor air quality also becomes a concern, necessitating proper ventilation and air purification measures. The interplay of agricultural practices, meteorological conditions, and the gradual transition between seasons shapes the air quality narrative in Bhainsahi, demanding proactive mitigation strategies.