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Bheja, a small town in the Bihar plains of India (26.1046°N, 86.3950°E), occupies a low-lying position within the Gangetic alluvium. Its elevation, typical of the region, is under 100 meters, contributing to limited atmospheric dispersion of pollutants. The surrounding landscape is predominantly agricultural, characterized by intensive farming of rice, wheat, and sugarcane. This agricultural activity, while vital to the local economy, introduces particulate matter from crop residue burning and fertilizer application. Bheja’s position isn’t near major industrial belts, but regional brick kilns and smaller-scale industrial activity in nearby towns contribute to background pollution levels. The town is situated approximately 20km from the Kosi River, which, while providing irrigation, can also contribute to humidity and potential for stagnant air masses. The urban-rural gradient is sharp; Bheja itself is a relatively small settlement, quickly transitioning to rural farmland. This proximity to agricultural sources, combined with the flat terrain and limited wind flow, creates conditions conducive to localized air pollution build-up. Dust from unpaved roads and construction further exacerbates the issue, particularly during the drier months. The lack of significant topographical features hinders natural ventilation, trapping pollutants near ground level.

Bheja experiences a distinct seasonal air quality pattern dictated by the monsoon and post-monsoon periods. The monsoon season (June-September) generally brings temporary relief, as rainfall washes away particulate matter and increased humidity suppresses dust. However, high humidity can also trap pollutants. October-November sees a significant deterioration in air quality as post-monsoon conditions prevail. Stubble burning from the harvested rice crop is rampant across Bihar during this period, contributing heavily to PM2.5 levels. Temperature inversions become more frequent, trapping pollutants close to the ground. Winter (December-February) is often the worst period, with consistently poor air quality due to low wind speeds, temperature inversions, and continued biomass burning for heating. Fog further reduces visibility and exacerbates pollution. March-May brings gradually improving conditions as temperatures rise and winds pick up, though dust storms are common in April-May. Sensitive groups – children, the elderly, and those with respiratory conditions – should avoid prolonged outdoor activity during October-February. During the monsoon, while overall pollution is lower, precautions should be taken to avoid damp-related respiratory issues. Monitoring local conditions is crucial.