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Chhapra, situated in the fertile plains of Bihar, India, occupies a geographically significant position along the banks of the Ganga River (Ganges). Its coordinates, 26.4005° N, 85.3721° E, place it within the Gangetic Plain, a vast alluvial landscape characterized by remarkably flat terrain and rich, loamy soils. The city’s elevation is relatively low, averaging around 58 meters (190 feet) above sea level, contributing to a tendency for pollutants to accumulate, particularly during periods of atmospheric stability. The surrounding landscape is predominantly agricultural, with extensive rice paddies and other crops dominating the rural areas. This agricultural activity, while vital for the regional economy, contributes to seasonal particulate matter pollution through biomass burning during harvest and residue management. Chhapra’s proximity to the Ganga influences local humidity and temperature, but also presents potential risks of waterborne pollutants impacting air quality through aerosolization. The urban–rural gradient around Chhapra is gradual, with smaller towns and villages blending seamlessly into the agricultural landscape. While Chhapra itself is a growing urban center, it lacks large-scale industrial zones directly within its boundaries. However, its location along major transportation routes connecting eastern Uttar Pradesh to Bihar means it experiences vehicular emissions. The flat topography and limited natural barriers exacerbate the impact of regional pollution sources, making Chhapra susceptible to transboundary air pollution events originating from industrial belts further north and west.

Chhapra’s air quality exhibits a distinct seasonal pattern dictated by the region’s monsoon climate. The summer months (April-June) are typically characterized by hot, dry conditions and stagnant air, frequently leading to elevated particulate matter concentrations. Temperature inversions, common during this period, trap pollutants near the ground, worsening air quality. Dust storms originating from the northwest also contribute significantly. The monsoon season (July-September) brings relief, with heavy rainfall effectively washing away pollutants and dispersing them. However, the monsoon also introduces humidity, which can exacerbate respiratory issues for sensitive individuals. The post-monsoon season (October-November) is often the most challenging. Farmers engage in widespread crop residue burning to clear fields for the next planting season, releasing substantial amounts of smoke and particulate matter into the atmosphere. This period frequently sees a noticeable decline in air quality. Winter months (December-March) are generally cooler, with frequent fog formation. Fog traps pollutants, reducing visibility and further concentrating airborne particles. Sensitive groups, including children, the elderly, and individuals with pre-existing respiratory conditions, should exercise caution during the summer and post-monsoon seasons, limiting outdoor activities during peak pollution periods. During the post-monsoon, wearing N95 masks is advisable. Maintaining indoor air quality through ventilation and air purifiers can also provide some protection. The monsoon offers a temporary respite, but vigilance is still necessary, particularly regarding humidity-related health concerns.