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Khutāha, nestled in the fertile plains of Bihar, India, occupies a geographically significant position within the Gangetic Basin. Located at approximately 25.2645° N, 86.0598° E, the town’s elevation is relatively low, around 98 meters above sea level, contributing to a tendency for pollutants to accumulate, particularly during periods of atmospheric stability. The surrounding landscape is predominantly agricultural, characterized by expansive fields of rice and wheat, typical of the Indo-Gangetic Plain. This agricultural activity, while vital to the regional economy, introduces sources of particulate matter through crop residue burning, a common practice after harvest. Khutāha’s proximity to the Ganges River, though providing a crucial water source, can also influence local weather patterns and, indirectly, air quality. The river’s moisture content can contribute to fog formation during the cooler months, trapping pollutants close to the ground. The urban–rural gradient around Khutāha is gradual, with small villages and agricultural lands seamlessly blending into the town’s periphery. While Khutāha itself is a small settlement, it’s situated within a broader region experiencing increasing industrial development, with pockets of small-scale manufacturing and brick kilns potentially impacting air quality. The flat terrain limits natural dispersion of pollutants, making the town susceptible to localized air quality challenges. The lack of significant topographical features means that wind patterns are often influenced by regional weather systems, rather than local geography.

Khutāha’s air quality follows a distinct seasonal pattern dictated by the region’s monsoon climate. The dry season, spanning roughly October to May, typically witnesses the poorest air quality. During these months, lower temperatures and reduced rainfall contribute to atmospheric stability, fostering temperature inversions where cooler, denser air becomes trapped beneath a layer of warmer air. This inversion prevents the vertical mixing of pollutants, leading to their concentration near ground level. The prevalence of fog, particularly in November and December, further exacerbates this issue, acting as a physical barrier that traps pollutants. Agricultural practices, specifically the widespread burning of crop residue after the harvest season (October-November), are a major contributor to particulate matter pollution during this period. The monsoon season (June-September) brings relief, with frequent rainfall washing away pollutants and strong winds dispersing them. However, the onset of the monsoon can initially be accompanied by increased humidity and occasional dust storms. The summer months (April-May) are characterized by high temperatures and relatively dry conditions, which can lead to increased ozone formation, although this is generally less of a concern than particulate matter. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, limiting outdoor activity during peak pollution periods, typically early mornings and evenings. Staying indoors with filtered air and wearing masks can offer some protection.