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Khāngāon, nestled in the state of Bihar, India, occupies a geographically significant position within the fertile Gangetic plains. Located at approximately 25.5146° N, 84.7528° E, the city’s terrain is predominantly flat, characteristic of the Indo-Gangetic alluvial plain. The elevation is relatively low, contributing to a tendency for pollutants to accumulate, particularly during periods of atmospheric stability. Khāngāon’s proximity to the Ganges River, though providing a vital water source, can also influence local air quality; moisture from the river can trap particulate matter under certain meteorological conditions. The surrounding landscape is a mosaic of agricultural fields – primarily rice and wheat cultivation – interspersed with small villages and scattered rural settlements, creating a gradual urban-rural gradient. This agricultural activity, while economically important, contributes to seasonal emissions from crop burning, a significant factor in air pollution. Further afield, the broader region is marked by industrial belts concentrated in larger cities like Patna, which can impact Khāngāon through long-range transport of pollutants. The flat topography and limited natural barriers exacerbate the impact of regional pollution sources, making Khāngāon susceptible to episodes of poor air quality. The lack of significant elevation changes also limits natural dispersion of pollutants, further compounding the challenges. The city’s small size (population 11,456) means that localized sources, such as vehicular emissions and household cooking fuels, can have a disproportionately large impact on air quality.

Khāngāon’s air quality follows a distinct seasonal pattern dictated by the region’s monsoon climate. The dry season, typically spanning from October to May, presents the most significant air quality challenges. During these months, lower humidity and reduced rainfall lead to a build-up of particulate matter. Stubble burning after the harvest season (November-December) is a major contributor, releasing significant quantities of smoke and pollutants into the atmosphere. Temperature inversions, common during the colder months (December-January), trap pollutants near the ground, further worsening conditions. The monsoon season (June-September) brings relief, with frequent rainfall washing away pollutants and strong winds dispersing them. However, even during the monsoon, periods of calm weather can lead to localized pollution episodes. The pre-monsoon period (March-May) often sees a rise in pollution levels as temperatures increase and winds weaken, creating stagnant atmospheric conditions. Fog, prevalent during the winter months, further exacerbates the problem by trapping pollutants and reducing visibility. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, particularly during periods of stubble burning and temperature inversions. Limiting outdoor activity during these times and using air purifiers indoors can help mitigate exposure. The transition months (March and October) require careful monitoring as conditions can shift rapidly, and air quality can deteriorate quickly.