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Banka, situated in the eastern Indian state of Bihar at coordinates 24.8900°N, 86.9200°E, occupies a strategic position in the Gangetic Plain, a vast alluvial region that profoundly influences its air quality dynamics. The city lies approximately 50 kilometers south of the Ganges River, with the Chotanagpur Plateau to the south and the fertile plains of Bihar extending northwards, creating a transitional zone between upland and lowland areas. At an elevation of around 80 meters above sea level, Banka's relatively flat terrain, characteristic of the Indo-Gangetic Basin, facilitates the stagnation of pollutants, while its proximity to agricultural zones—where rice and wheat cultivation dominate—exacerbates seasonal burning practices. The urban–rural gradient is pronounced, with Banka serving as a district headquarters amidst predominantly rural surroundings, where domestic biomass burning for cooking and heating is prevalent. The region's dense network of unpaved roads contributes significantly to road dust, particularly during dry months, and brick kilns operate in peri-urban fringes, adding industrial emissions. Banka's location in a humid subtropical climate zone, with the Himalayan foothills to the north, often traps pollutants under temperature inversions, especially in winter, while its distance from major water bodies like the Ganges limits natural cleansing effects, making it a hotspot for particulate matter accumulation from both local and transboundary sources, including forest fires from nearby wooded areas.

In Banka, air quality follows a distinct seasonal pattern driven by meteorological factors and human activities, with the worst conditions from November to February. During winter, cold waves and dense fog prevail, leading to temperature inversions that trap pollutants near the ground, compounded by domestic biomass burning for heating and agricultural residue burning post-harvest. This period sees peak pollution, making outdoor activities hazardous, especially for sensitive groups like children, the elderly, and those with respiratory conditions, who should limit exposure and use masks. Spring brings gradual warming, reducing inversion layers but still affected by lingering dust and occasional forest fires, with moderate air quality. The summer months experience extreme heat, which can elevate ozone levels, though increased wind dispersal offers some relief; however, heatwaves may worsen respiratory stress. The monsoon from June to September dramatically improves air quality as heavy rains wash away pollutants, with the lowest AQI levels, making this the best time for outdoor activities. Post-monsoon, from October, pollution begins to rise again due to agricultural burning and reduced rainfall, signaling a return to hazardous conditions. Sensitive groups should monitor weather forecasts, avoid outdoor exertion during peak months, and consider indoor air purifiers, while all residents benefit from staying informed about local air quality advisories.