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Bistāria, nestled within the state of Bihar, India, occupies a geographically significant position in the Gangetic plains. Located at approximately 26.1262° latitude and 87.2300° longitude, the city’s terrain is predominantly flat, characteristic of the Indo-Gangetic alluvial plain. Its elevation is relatively low, contributing to atmospheric stability and potential for pollutant accumulation. Bistāria’s proximity to the Ganges River, though not directly on its banks, influences regional humidity and weather patterns, which in turn impact air dispersion. The surrounding landscape is a mosaic of agricultural fields – primarily rice and wheat cultivation – interspersed with small villages and scattered industrial units. This agricultural zone contributes to seasonal particulate matter, particularly during harvest periods when stubble burning is practiced. The urban–rural gradient around Bistāria is gradual, with agricultural land transitioning seamlessly into residential areas, often lacking clear demarcation. The city itself is a small, localized urban center, with limited industrial activity compared to larger Bihar cities like Patna. However, the increasing vehicular traffic and reliance on solid fuels for cooking and heating, especially during colder months, are localized sources of air pollution. The regional position within Bihar, a state experiencing rapid urbanization and industrial growth, means Bistāria is susceptible to pollutants transported from more industrialized areas, further complicating its air quality profile. The flat topography hinders effective air circulation, potentially trapping pollutants close to the ground.

Bistāria’s air quality follows a distinct seasonal pattern dictated by the region’s monsoon climate. The monsoon season, typically from June to September, brings relief from accumulated pollutants due to frequent rainfall and increased wind speeds, effectively flushing the atmosphere. However, the preceding pre-monsoon period (March-May) often witnesses a significant deterioration in air quality. High temperatures and stagnant air conditions, coupled with agricultural practices like stubble burning, lead to elevated particulate matter concentrations. Temperature inversions, common during this period, trap pollutants near the ground, exacerbating the problem. The winter months (November-February) are characterized by cooler temperatures and frequent fog, which severely restricts air dispersion and leads to a build-up of pollutants. The fog, combined with the use of solid fuels for heating, significantly impacts air quality. The post-monsoon season (October) sees a transitional period with improving air quality as rainfall decreases and winds pick up. 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 episodes. Outdoor exercise is generally more favorable during the monsoon season, although heavy rainfall can still pose challenges. Agricultural communities should be particularly mindful of the impact of burning practices and explore alternative methods for managing crop residue to minimize air pollution’s impact on local residents.