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Balhāpur, nestled in the state of Bihar, India, occupies a geographically significant position within the fertile Gangetic plains. Located at approximately 25.3511° N, 86.2122° E, the city’s terrain is predominantly flat, characteristic of the Indo-Gangetic alluvial plain. This low-lying topography, with an elevation of roughly 55 meters above sea level, contributes to a tendency for pollutants to accumulate, particularly during periods of atmospheric stability. The surrounding landscape is dominated by agricultural fields – rice and wheat cultivation being prevalent – which, while vital for the regional economy, can contribute to particulate matter through seasonal burning practices. Balhāpur’s proximity to the Ganges River, though providing a crucial water source, also influences local weather patterns, occasionally leading to humidity and fog, which can trap pollutants. The urban–rural gradient around Balhāpur is relatively gradual; the city itself is small, and agricultural land quickly transitions to residential areas. While not directly adjacent to major industrial belts, the region experiences transportation-related pollution due to its position on key roadways connecting larger urban centers. The flat, expansive nature of the plain limits natural ventilation, exacerbating the potential for localized air quality issues. The soil composition, rich in silt and clay, can also contribute to dust resuspension, particularly during drier periods and construction activities. The overall geographic setting presents challenges for maintaining optimal air quality, requiring targeted mitigation strategies.

Balhāpur’s air quality follows a distinct seasonal pattern dictated by the region’s monsoon climate. The dry season, typically spanning from October to May, witnesses a progressive deterioration in air quality. November and December often experience dense fog, a consequence of cooler temperatures and high humidity, which significantly traps pollutants near the ground. This period is characterized by stagnant air and reduced dispersion, leading to a build-up of particulate matter and gaseous pollutants. Agricultural burning, a common practice after the harvest season, further compounds the problem, releasing significant quantities of smoke and soot. January and February are often the most challenging months, with persistent fog and elevated pollution levels. The onset of the monsoon season in June brings a welcome respite, as rainfall effectively washes away pollutants and strong winds disperse accumulated contaminants. July and August typically see improved air quality, although humidity remains high. The post-monsoon transition period, from September to October, can be variable, with occasional dust storms and a gradual return of drier conditions. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, particularly during periods of dense fog. Limiting outdoor exertion and wearing appropriate masks are advisable. The monsoon months offer a window for increased outdoor activity, but vigilance regarding potential allergens remains important. The interplay of temperature, humidity, wind patterns, and agricultural practices shapes Balhāpur’s air quality throughout the year, demanding proactive management strategies.