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Bangaon, situated in the state of Bihar, India, at coordinates 25.8673°N, 86.5115°E, is a small urban centre deeply embedded within the fertile Gangetic plains. The terrain is predominantly flat, characteristic of alluvial deposits from the Ganges River, which flows relatively close by, influencing local humidity and contributing to the region’s agricultural productivity. Bangaon’s population of approximately 33,770 reflects its status as a developing town, transitioning from a largely rural character. Surrounding Bangaon are extensive agricultural lands, primarily dedicated to rice and sugarcane cultivation, with smaller pockets of vegetable farming. This agricultural dominance introduces seasonal biomass burning, a significant contributor to localised air pollution. The urban-rural gradient is sharp, with a rapid transition from densely populated areas to open farmland. While Bangaon itself doesn’t host heavy industry, its proximity to larger industrial hubs in Bihar means it can experience transboundary pollution. The lack of significant topographical features – hills or forests – limits natural dispersion of pollutants, exacerbating air quality issues. The region’s climate, a humid subtropical type, further influences pollution concentration, with stagnant air conditions common during certain times of the year. This geographical setting creates a unique set of challenges for maintaining clean air.

Bangaon’s air quality follows a distinct seasonal pattern. The post-monsoon period, from October to November, typically sees the worst conditions. The burning of crop residue after the harvest, combined with cooler temperatures and stagnant air, leads to a significant spike in particulate matter. December and January bring cooler, drier air, often with temperature inversions trapping pollutants near the ground, though wind speeds can occasionally offer some relief. The pre-monsoon months, March to May, are characterised by rising temperatures and dust storms, increasing levels of coarser particulate matter. The monsoon season, from June to September, generally offers the cleanest air. Heavy rainfall effectively washes away pollutants, and increased humidity causes particles to settle. However, increased cloud cover can also contribute to localised humidity and reduced sunlight. Sensitive groups – children, the elderly, and those with respiratory conditions – should avoid prolonged outdoor activity during October-November and March-May. During the monsoon, while air is cleaner, the increased humidity can exacerbate respiratory issues for some. Monitoring local weather patterns is crucial for informed decisions regarding outdoor exposure.