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Basāon, nestled in the fertile plains of Bihar, India, occupies a geographically significant position within the Gangetic Basin. Located at approximately 26.2082° N, 84.6174° 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 through seasonal burning practices. Basāon’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 Basāon is gradual; the town itself is relatively small, but it serves as a local trading hub for surrounding villages. While not directly adjacent to major industrial belts, it’s within a reasonable distance of industrial zones in larger Bihar cities, potentially experiencing downwind pollution transport. The flat, expansive nature of the region, combined with the agricultural activity and potential for industrial influence, creates a setting where air quality is particularly susceptible to seasonal and meteorological variations. The lack of significant topographical features to disperse pollutants is a key factor shaping Basāon’s air quality profile.

Basāon’s air quality follows a distinct seasonal pattern dictated by the region’s monsoon climate. The pre-monsoon season (March-May) typically witnesses the worst air quality, characterized by stagnant air and increased agricultural burning. Farmers clearing crop residue after the harvest season contribute significantly to particulate matter pollution. Temperature inversions, common during this period, trap pollutants near the surface, exacerbating the problem. The monsoon season (June-September) brings relief as strong winds and frequent rainfall flush out accumulated pollutants, leading to a noticeable improvement in air quality. However, heavy rainfall can also lead to localised flooding and associated issues. The post-monsoon season (October-November) sees a gradual return to poorer air quality as agricultural burning resumes, though generally less intense than in the pre-monsoon period. Winter months (December-February) are often marked by dense fog, which further restricts pollutant dispersion and can lead to periods of reduced visibility and elevated particulate matter. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the pre-monsoon and winter months, limiting outdoor activities during peak pollution periods. Maintaining indoor air quality through ventilation and air purifiers is also advisable. The interplay of agricultural practices, meteorological conditions, and the gradual transition between seasons creates a complex air quality dynamic in Basāon, demanding proactive mitigation strategies.