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Basārh, a small town nestled in the Saharsa district of Bihar, India, occupies a geographically significant position within the fertile Gangetic plains. Located at approximately 25.9808° N, 85.1285° E, its terrain is predominantly flat, characteristic of the Indo-Gangetic Plain, with an elevation of around 128 meters above sea level. The surrounding landscape is dominated by agricultural fields – rice and maize cultivation are prevalent – extending as far as the eye can see, contributing to seasonal biomass burning. Basārh’s proximity to the Koshi River, though providing a vital water source, also influences local weather patterns, increasing humidity and potentially trapping pollutants under certain atmospheric conditions. The town sits within a gradual urban–rural gradient; while Basārh itself is a relatively small settlement, it serves as a local trading hub for the surrounding agricultural communities. Further afield, the industrial belt of North Bihar, centered around Muzaffarpur and Samastipur, introduces a regional source of industrial emissions. The flat topography and lack of significant natural barriers exacerbate the potential for pollutant dispersion, particularly during periods of low wind speed. The prevailing winds, often light and variable, can lead to stagnation and the accumulation of pollutants, especially during cooler months. The soil composition, largely alluvial, can also contribute to dust generation, further impacting air quality. The town's limited infrastructure and reliance on traditional cooking methods in many households add to localized pollution sources.

Basārh’s air quality experiences a distinct seasonal cycle heavily influenced by the monsoon and agricultural practices. The monsoon season, typically from June to September, brings relief with frequent rainfall, effectively flushing out pollutants and resulting in generally improved air quality. However, the preceding pre-monsoon period (March-May) often witnesses a significant deterioration. Rising temperatures and decreasing humidity create stable atmospheric conditions, frequently leading to temperature inversions that trap pollutants near the ground. Agricultural burning, a common practice for clearing fields after the harvest, intensifies during this period, releasing substantial amounts of particulate matter and other harmful gases. The post-monsoon season (October-November) sees a gradual return to cooler temperatures, but persistent fog, particularly in November, further restricts pollutant dispersion, exacerbating the impact of residual agricultural burning. Winter months (December-February) are generally the most challenging, with cold, calm conditions and frequent fog episodes. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during these months, limiting outdoor exposure and considering the use of air purifiers. During the pre-monsoon and winter months, it’s advisable to avoid strenuous outdoor activities, especially during early morning and late evening hours when fog is most prevalent. The humid conditions during the monsoon, while beneficial for air quality, can still trigger respiratory issues in some individuals, necessitating careful monitoring and appropriate precautions.