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Banka, West Bengal, situated at approximately 22.61°N latitude and 88.28°E longitude, occupies a geographically significant position within the fertile Gangetic plains of eastern India. The city’s terrain is predominantly flat, characteristic of the Indo-Gangetic alluvial plain, with an average elevation of around 128 meters (420 feet) above sea level. This low-lying topography, while conducive to agriculture, presents challenges regarding air quality dispersion. Banka lies within a region heavily reliant on agriculture, particularly rice and maize cultivation, with surrounding rural areas exhibiting a gradual urban–rural gradient as one approaches the city. The landscape is dominated by agricultural fields interspersed with scattered villages and small settlements. While Banka itself isn't directly adjacent to a major river, it’s part of the larger Ganges basin watershed, influencing regional hydrology and potentially impacting atmospheric moisture content. The city’s proximity to industrial belts in Bihar, though not immediately bordering one, means pollutants can be transported via prevailing winds. The flat terrain limits vertical mixing of air, especially during periods of stable atmospheric conditions, leading to pollutant accumulation. Furthermore, the prevalence of brick kilns in the surrounding districts, a common feature of the region's construction industry, contributes significantly to particulate matter pollution. The lack of significant natural barriers, such as hills or mountains, further exacerbates the issue, allowing pollutants to spread easily across the landscape. Banka’s location within a densely populated and agriculturally intensive region makes it particularly vulnerable to air quality degradation.

Banka’s air quality follows a distinct seasonal pattern dictated by the region’s monsoonal 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, the preceding pre-monsoon period (March-May) often witnesses a significant deterioration in air quality. High temperatures, stagnant air, and the prevalence of dust storms originating from the arid regions of northwest India contribute to elevated particulate matter levels. Temperature inversions, common during this period, trap pollutants near the ground, worsening conditions. The post-monsoon season (October-November) sees a gradual improvement as rainfall decreases, but agricultural burning, a widespread practice for clearing fields, introduces significant smoke and particulate pollution. Winter months (December-February) are characterized by cooler temperatures and frequent fog, which severely restricts atmospheric mixing and traps pollutants, creating periods of poor visibility and compromised air quality. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the pre-monsoon and winter months, limiting outdoor activities during peak pollution episodes. Agricultural workers are particularly vulnerable and should utilize respiratory protection when possible. The monsoon provides a natural cleansing effect, making it the most favourable time for outdoor pursuits. Public health advisories are often issued during the pre-monsoon and winter seasons, urging residents to monitor air quality reports and take necessary precautions to minimize exposure.