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Bairi Chak, nestled in the state of Bihar, India, occupies a geographically significant position within the fertile Gangetic plains. Located at approximately 24.6951° N, 84.9913° E, the town’s terrain is predominantly flat, characteristic of the Indo-Gangetic alluvial plain, resulting in minimal elevation changes. This flatness, while conducive to agriculture, presents challenges for air quality dispersion. Bairi Chak lies within a region heavily reliant on agriculture, with surrounding landscapes dominated by rice paddies and other cultivated fields, contributing to seasonal biomass burning. The proximity to the Ganges River, though providing a vital water source, can also influence local weather patterns and, under certain conditions, trap pollutants. The urban–rural gradient around Bairi Chak is gradual; the town itself represents a small urban centre surrounded by a predominantly rural agricultural landscape. Further afield, the Chota Nagpur Plateau lies to the south, influencing regional wind patterns and potentially carrying dust and particulate matter northward. Industrial activity in the broader Bihar region, particularly in areas further west and north, can contribute to transboundary pollution events. The lack of significant topographical features hinders the natural cleansing of the atmosphere, leading to a tendency for pollutants to accumulate, especially during periods of stagnant air. The flat terrain and agricultural surroundings combine to create a unique environmental context where agricultural practices and regional industrial emissions significantly impact local air quality.

Bairi Chak’s air quality experiences a distinct seasonal cycle heavily influenced by the monsoon and agricultural practices. The pre-monsoon season (March-May) typically witnesses the worst air quality, driven by a combination of factors. Agricultural residue burning, a common practice after the harvest of winter crops, releases substantial quantities of particulate matter and gases into the atmosphere. High temperatures and low wind speeds during this period exacerbate the problem, leading to stagnant air and pollutant accumulation. The monsoon season (June-September) brings relief, as increased rainfall and stronger winds naturally cleanse the air. However, even during the monsoon, localized pollution from agricultural activities and sporadic industrial emissions can occur. The post-monsoon season (October-November) sees a return to poorer air quality as farmers prepare fields for the winter crop, again leading to widespread burning. Winter months (December-February) are often characterized by fog, which traps pollutants near the ground, further reducing visibility and increasing exposure. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the pre-monsoon and post-monsoon seasons, limiting outdoor activities during peak pollution periods. Maintaining indoor air quality through ventilation and air purifiers is also advisable. The cyclical nature of agricultural practices dictates that periods of heightened pollution are unavoidable, but awareness and mitigation strategies are crucial for protecting public health.