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Saraiya, a small town nestled in the Saran district of Bihar, India, occupies a geographically significant position within the fertile Gangetic plains. Located at approximately 25.6467° N, 84.6312° E, its terrain is predominantly flat, characteristic of the Indo-Gangetic Plain, with an average elevation of around 58 meters above sea level. The town sits close to the Ghaghara River, a major tributary of the Ganges, influencing local microclimates and potentially contributing to humidity levels. Saraiya’s regional context is crucial; it lies within a densely populated agricultural belt, surrounded by rural landscapes dominated by rice and maize cultivation. This agricultural activity, while vital for the regional economy, contributes to seasonal biomass burning, a significant factor in air quality. The urban–rural gradient around Saraiya is gradual, with small villages and agricultural fields transitioning seamlessly into the town's limited urban footprint. Further afield, the Chota Nagpur Plateau lies to the south, influencing regional weather patterns and wind direction. The proximity to industrial zones in larger cities like Chapra and Patna, though not immediately adjacent, can still result in the advection of pollutants. The flat topography inhibits atmospheric dispersion, trapping pollutants and exacerbating air quality challenges, particularly during periods of stagnant air. The lack of significant natural barriers further compounds this issue, making Saraiya vulnerable to regional pollution episodes.

Saraiya’s air quality follows a distinct seasonal pattern dictated by the region’s monsoon climate. The dry season, typically spanning October to May, presents the most significant air quality concerns. During these months, lower humidity and reduced rainfall contribute to the accumulation of pollutants. Agricultural residue burning, a widespread practice after the harvest season (October-November), releases substantial quantities of particulate matter and other harmful gases, dramatically degrading air quality. Temperature inversions, common during the colder months (December-January), trap pollutants near the ground, further intensifying the problem. The monsoon season (June-September) brings relief, with frequent rainfall washing away pollutants and strong winds dispersing them. However, even during the monsoon, localized pollution from construction activities and vehicular emissions persists. The transitional periods – the pre-monsoon (March-May) and post-monsoon (September-October) – often experience elevated levels of dust and pollutants due to increased construction and agricultural activity, respectively. Fog, prevalent during the winter months, significantly reduces visibility and traps pollutants, creating hazardous conditions. Sensitive groups, including children, the elderly, and individuals with respiratory illnesses, should exercise caution during the dry season, particularly during periods of agricultural burning and fog. Limiting outdoor exertion and wearing appropriate masks are advisable during these times. The monsoon offers a window of improved air quality, but vigilance regarding localized pollution sources remains important.