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Bijni, nestled in the Chirang district of Assam, India, occupies a geographically significant position within the Brahmaputra Valley. Located at approximately 26.4959° N, 90.7030° E, the town sits on the edge of a gently undulating terrain, transitioning from the alluvial plains to the foothills of the Himalayas. The surrounding landscape is predominantly characterized by dense tropical forests, interspersed with agricultural fields cultivating rice and jute – key components of Assam’s economy. The elevation is relatively low, averaging around 120 meters above sea level, contributing to a humid subtropical climate and influencing atmospheric stability. Bijni’s proximity to the Beki River, a major tributary of the Brahmaputra, plays a role in local humidity and potential for riverine fog formation, which can trap pollutants. While not directly adjacent to major industrial belts, the region experiences agricultural burning during post-harvest seasons, a significant contributor to particulate matter. The urban–rural gradient around Bijni is gradual; the town itself is a small, developing settlement, surrounded by a patchwork of agricultural land and forested areas. This blend of agricultural activity, dense vegetation, and low elevation creates a unique microclimate that can exacerbate air quality challenges, particularly during periods of stagnant air or seasonal burning. The valley's topography tends to funnel air masses, potentially concentrating pollutants within the local area. The surrounding forests, while generally beneficial for air quality, can also release biogenic volatile organic compounds (BVOCs) that react with other pollutants.

Bijni’s air quality follows a distinct seasonal pattern dictated by the region’s monsoon climate. The monsoon season, typically spanning June to September, brings heavy rainfall and strong winds, generally leading to improved air quality as pollutants are washed away and dispersed. However, the preceding pre-monsoon period (March-May) often witnesses a concerning rise in air pollution, primarily due to agricultural burning. Farmers clearing crop residue after the harvest season release substantial amounts of smoke and particulate matter, significantly impacting local air quality. The post-monsoon season (October-November) can also experience elevated pollution levels as humidity decreases and wind speeds lessen, allowing pollutants to accumulate. During the dry winter months (December-February), fog is a frequent occurrence, particularly in the mornings. This dense fog traps pollutants near the ground, creating conditions of poor visibility and potentially exacerbating respiratory issues. Temperature inversions, common during these colder months, further contribute to this phenomenon by preventing vertical mixing of the air. 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. The monsoon offers a respite, but even then, localized burning can still occur. Maintaining indoor air quality through ventilation and air purification can be beneficial throughout the year, especially during periods of elevated pollution.