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Bishunpur Sundar, nestled in the state of Bihar, India, occupies a geographically significant position within the fertile Gangetic plains. Located at approximately 26.0579° latitude and 86.9833° longitude, the town’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. Bishunpur Sundar’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. This creates a gradual urban-rural gradient, with agricultural activities contributing to seasonal dust and biomass burning episodes. Further afield, Bihar’s industrial belt, concentrated around cities like Patna and Munger, exerts a regional influence on air quality, with potential for transported pollutants. The town’s relatively small size (population 25,773) means that local industrial emissions are less of a direct concern than broader regional factors. The flat topography and prevailing wind patterns, often influenced by the monsoon system, play a crucial role in the dispersion – or lack thereof – of airborne pollutants. The lack of significant natural barriers further exacerbates this, allowing pollutants to spread across the landscape.

Bishunpur Sundar experiences a distinct wet and dry season, significantly impacting its air quality profile. The dry season, typically spanning from October to May, is characterized by lower rainfall and increased dust levels due to agricultural activities like harvesting and land preparation. Temperature inversions, common during the colder months (December-February), trap pollutants near the ground, leading to periods of stagnant air and potentially elevated concentrations of particulate matter. Biomass burning, a widespread practice for crop residue disposal, further contributes to this pollution load, particularly in November and December. The monsoon season (June-September) brings relief through frequent rainfall, effectively scrubbing the atmosphere and dispersing pollutants. However, the onset of the monsoon can initially be accompanied by increased humidity and fog, which can temporarily trap pollutants. The transition periods – the pre-monsoon (March-May) and post-monsoon (September-October) – are often marked by high temperatures and dry winds, creating conditions conducive to dust storms and increased particulate matter. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, particularly during periods of fog or dust storms. Outdoor activities are generally more favourable during the monsoon months, although humidity can still be a factor. Agricultural workers are particularly vulnerable to dust exposure during the pre-monsoon and post-monsoon periods, necessitating the use of appropriate protective gear.