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Mahuwa Singhrai, nestled in the southwestern reaches of Bihar, India, occupies a geographically significant position within the fertile Gangetic plains. Located at approximately 25.8168° N, 85.3853° E, the town’s terrain is predominantly flat, characteristic of the Indo-Gangetic alluvial plain, with an elevation hovering around 128 meters above sea level. This low-lying topography, while conducive to agriculture, presents challenges regarding air quality dispersion. The surrounding landscape is dominated by agricultural fields – primarily rice and maize cultivation – interspersed with scattered villages and small-scale industries. Mahuwa Singhrai sits within a gradual urban–rural gradient; it’s a market town serving the surrounding agricultural communities, experiencing slow but steady urban expansion. The proximity to the Ghaghara River, though providing a vital water source, can also contribute to localized humidity, potentially trapping pollutants under certain meteorological conditions. The region's climate is subtropical, with hot summers and cool winters, influencing atmospheric stability and pollutant behaviour. Further complicating matters is the town's location within a broader agricultural belt, where seasonal burning of crop residue is a common practice, contributing significantly to particulate matter pollution. The lack of significant natural barriers and the relatively flat terrain mean that pollutants released from both local and regional sources can readily spread across the area, impacting air quality in Mahuwa Singhrai and its environs. The town's limited green spaces further exacerbate this issue, reducing the natural capacity for air purification.

Mahuwa Singhrai’s air quality follows a distinct seasonal pattern dictated by the region’s subtropical monsoon climate. The pre-monsoon season (March-May) typically witnesses the worst air quality, driven by a combination of factors. High temperatures lead to increased ozone formation, while stagnant air masses and frequent temperature inversions trap pollutants close to the ground. Agricultural burning, a widespread practice following the harvest of winter crops, releases substantial amounts of particulate matter and other harmful gases, significantly degrading air quality. The monsoon season (June-September) brings relief, as increased rainfall and strong winds effectively flush out pollutants. Humidity levels also rise, which can affect the respiratory system. Post-monsoon (October-November) sees a return to poorer air quality, as agricultural burning resumes, albeit often less intensely than in the pre-monsoon period. The winter months (December-February) are generally characterized by cooler temperatures and frequent fog, which further restricts air dispersion and traps pollutants, particularly during periods of calm winds. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the pre-monsoon and post-monsoon seasons, limiting outdoor activities during peak pollution periods. Maintaining indoor air quality through ventilation and air purifiers is also advisable. The monsoon months offer the most favourable conditions for outdoor activity, although high humidity can still pose challenges for some individuals. Awareness campaigns promoting cleaner agricultural practices and reducing reliance on burning are crucial for improving long-term air quality.