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Chandauli, Bihar, nestled at approximately 25.8972° latitude and 85.7161° longitude, occupies a geographically significant position within the Gangetic plains. The city’s terrain is predominantly flat, characteristic of the Indo-Gangetic Plain, with gentle undulations defining the surrounding landscape. Elevation is relatively low, contributing to atmospheric stability and potential for pollutant accumulation. Situated near the confluence of the Ganges River, Chandauli benefits from proximity to a major waterway, though its impact on air quality is complex – while the river can facilitate dispersion under certain conditions, it also supports intensive agricultural practices in the surrounding areas. These agricultural zones, particularly those employing traditional farming methods and crop residue burning, represent a significant source of particulate matter. The urban–rural gradient around Chandauli is gradual, with agricultural land transitioning into small settlements and then into the city itself. Further afield, the region is characterized by a mix of agricultural land and scattered industrial activity, including coal-based power plants and small-scale manufacturing units, which collectively contribute to localized air pollution. The flat topography and prevailing wind patterns often lead to stagnant air conditions, especially during cooler months, exacerbating the impact of these emissions. The surrounding landscape, largely dominated by fertile plains and agricultural fields, influences the types of pollutants prevalent – biomass burning from agricultural practices being a key factor. The city's location within a densely populated state further compounds these challenges, increasing the overall burden of anthropogenic emissions.

Chandauli’s air quality follows a distinct seasonal pattern dictated by the region’s monsoon climate. The monsoon season, typically spanning June to September, brings relief from accumulated pollutants due to frequent rainfall and increased wind speeds, effectively flushing the atmosphere. However, even during this period, localized pollution from agricultural activities persists. The transition months of October and November are particularly challenging. Following the harvest season, widespread crop residue burning becomes a major contributor to particulate matter, significantly degrading air quality. This period often sees the worst air quality conditions, exacerbated by temperature inversions that trap pollutants near the ground. Winter months (December-February) are characterized by cooler temperatures and calmer winds, leading to stagnant air and a build-up of pollutants. Fog, common during this period, further reduces visibility and traps pollutants. Spring (March-May) sees a gradual improvement as temperatures rise and winds increase, dispersing pollutants. However, dust storms originating from the Thar Desert can occasionally impact air quality. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the post-monsoon and winter months, limiting outdoor exposure and using appropriate respiratory protection when necessary. Agricultural workers are particularly vulnerable and should take precautions during crop residue burning season. The interplay of monsoon patterns, agricultural practices, and meteorological conditions creates a dynamic air quality profile throughout the year, demanding adaptive strategies for public health protection.