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Sundarpur, Bihar, situated at 26.3037° N, 84.8581° E, occupies a geographically significant position within the fertile Gangetic plains of India. The city’s terrain is predominantly flat, characteristic of the Indo-Gangetic alluvial plain, resulting in minimal elevation changes – a factor that can exacerbate air pollution accumulation. Located approximately 120km southwest of Patna, Bihar’s capital, Sundarpur lies within a region heavily influenced by agricultural practices, with vast stretches of farmland surrounding the urban area. This proximity to intensive agricultural zones contributes to seasonal particulate matter pollution from crop residue burning, a common practice after the harvest season. The landscape is punctuated by smaller rivers and tributaries flowing into the Ganges, though Sundarpur itself isn't directly adjacent to a major water body, limiting the natural cleansing effect of water vapor on the atmosphere. The urban–rural gradient transitions rapidly around Sundarpur; the city represents a small, localized urban center surrounded by a predominantly rural agricultural landscape. While not directly within a major industrial belt, Sundarpur’s regional connectivity and proximity to larger industrial hubs in Bihar can lead to the advection of pollutants. The flat topography and lack of significant wind channels can trap pollutants, particularly during periods of atmospheric stability. The surrounding landscape, dominated by agricultural fields and scattered villages, contributes to a unique blend of rural and urban influences on the local air quality, making it susceptible to both agricultural and localized urban emissions.

Sundarpur’s air quality follows a distinct seasonal pattern dictated by the region’s monsoon climate. The dry season, typically spanning October to May, witnesses a significant deterioration in air quality. Post-harvest crop residue burning, a widespread agricultural practice, releases substantial quantities of particulate matter into the atmosphere, creating a persistent haze. November and December are particularly challenging months, often experiencing the highest levels of pollution due to the combination of burning and stagnant air conditions. Temperature inversions, common during the cooler months, trap pollutants near the ground, further worsening the situation. The monsoon season, from June to September, brings relief as rainfall washes away pollutants and strong winds disperse them. However, even during the monsoon, periods of low wind speed and increased humidity can lead to localized pollution episodes. The pre-monsoon period (April-May) can also experience elevated pollution levels due to dust storms and continued agricultural burning. Fog, prevalent during the winter months, further concentrates pollutants, reducing visibility and increasing respiratory risks. Sensitive groups, including children, the elderly, and individuals with pre-existing respiratory conditions, should minimize outdoor activity during the dry season, particularly during peak burning periods. During the monsoon, while generally cleaner, individuals with allergies should be mindful of increased pollen and mold counts. Maintaining indoor air quality through ventilation and air purifiers is advisable throughout the year, especially during periods of elevated pollution.