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Biswanath Chariali, nestled in the heart of Assam, India, occupies a geographically significant position within the Brahmaputra Valley. Located at approximately 26.73°N latitude and 93.15°E longitude, the town sits at a modest elevation of around 125 meters (410 feet) above sea level. The surrounding landscape is predominantly characterized by fertile alluvial plains, a direct consequence of the Brahmaputra River's sediment deposition over millennia. This rich soil supports extensive agricultural activity, primarily rice cultivation, which forms a crucial part of the regional economy and contributes to local air quality dynamics. The town’s proximity to the Brahmaputra River, though not directly on its banks, influences the local climate and humidity levels. The urban character of Biswanath Chariali is that of a developing town, transitioning from a rural agricultural hub to a localized commercial center. The urban–rural gradient is relatively gradual, with agricultural fields and smaller villages blending seamlessly into the town's periphery. While not situated within a major industrial belt, the presence of smaller-scale industries, including rice mills and brick kilns, contributes to localized pollution sources. The terrain is generally flat, which can exacerbate the accumulation of pollutants, particularly during periods of low wind speed. The valley's topography, enclosed by the foothills of the Himalayas to the north, can sometimes trap air masses, influencing regional air quality patterns and creating conditions conducive to stagnant air and pollutant build-up. The overall geographic setting presents a complex interplay of natural factors and human activities impacting the air quality of Biswanath Chariali.

Biswanath Chariali’s air quality experiences a distinct seasonal cycle dictated by the region’s monsoon climate. The monsoon season, typically spanning from June to September, brings heavy rainfall and strong winds, generally leading to improved air quality as pollutants are washed away and dispersed. However, periods of intense rainfall can also lead to localized flooding, which can temporarily release pollutants from inundated areas. The pre-monsoon months (March-May) often witness a concerning rise in air pollution. Rising temperatures and decreasing rainfall create stable atmospheric conditions, frequently accompanied by temperature inversions, where a layer of warm air traps cooler air near the ground, preventing the vertical dispersion of pollutants. Agricultural burning, a common practice to clear fields for the planting season, significantly contributes to particulate matter pollution during this period. The post-monsoon season (October-November) sees a gradual improvement in air quality as the monsoon’s influence wanes, but lingering agricultural activities and cooler temperatures can still lead to localized pollution episodes. Winter months (December-February) are often characterized by fog, which traps pollutants near the ground, reducing visibility and exacerbating respiratory issues. Sensitive groups, including children, the elderly, and individuals with pre-existing respiratory conditions, should exercise caution during the pre-monsoon and winter months, limiting outdoor activities during peak pollution periods and utilizing air purifiers when available. Maintaining awareness of local weather patterns and agricultural practices is crucial for informed decision-making regarding outdoor exposure.