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Sonāpur, a small town nestled in the fertile plains of Bihar, India, occupies a geographically significant position within the Gangetic Basin. Located at approximately 25.3561° N, 86.2082° E, the town’s terrain is predominantly flat, characteristic of the Indo-Gangetic Plain, with an elevation of roughly 38 meters above sea level. This low-lying topography contributes to a tendency for pollutants to accumulate, particularly during periods of atmospheric stability. Sonāpur sits near the confluence of the Gandak River and the Ganges, although the immediate proximity doesn't offer significant air quality benefits due to the prevalence of other pollution sources. The surrounding landscape is dominated by intensive agricultural land, a patchwork of rice paddies and other crops, which, while vital for the regional economy, can contribute to air pollution through seasonal burning practices after harvest. To the west, one finds the beginnings of the Chota Nagpur Plateau, a more elevated region that can sometimes influence wind patterns and dispersal of pollutants. The urban–rural gradient around Sonāpur is gradual; the town itself is relatively small, but it serves as a local trading hub for the surrounding agricultural communities. Industrial activity is limited within Sonāpur itself, but its location within Bihar places it within reach of larger industrial belts further west, potentially impacting air quality through transported pollutants. The flat, expansive nature of the region, combined with the agricultural practices and proximity to industrial zones, creates a complex interplay of factors influencing Sonāpur’s air quality.

Sonāpur’s air quality experiences a distinct seasonal cycle heavily influenced by regional weather patterns. The pre-monsoon season (March-May) typically witnesses the poorest air quality. High temperatures and stagnant air conditions, often exacerbated by temperature inversions trapping pollutants near the ground, contribute to elevated levels of particulate matter. Agricultural burning, a common practice after the winter harvest, significantly worsens the situation during this period. The monsoon season (June-September) brings a welcome respite, as increased rainfall and stronger winds effectively flush out pollutants. Humidity also rises, which can affect the respiratory system. The post-monsoon season (October-November) sees a gradual return to less favourable conditions, with cooler temperatures and calmer winds leading to pollutant accumulation. Fog, a frequent occurrence during these months, further restricts dispersion. Winter (December-February) is generally the coldest period, with frequent fog episodes that severely limit visibility and trap pollutants, creating a hazy atmosphere. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the pre-monsoon and post-monsoon seasons, limiting outdoor activity during peak pollution periods. During the monsoon, while air quality improves, the increased humidity can still pose challenges for those with asthma or allergies. Maintaining indoor air quality through ventilation and air purification can be beneficial throughout the year, particularly during periods of poor outdoor air quality.