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Beldaur, a small town in the Khagaria district of Bihar, India, occupies a relatively flat alluvial plain within the Indo-Gangetic basin. Situated at coordinates 25.5947°N, 86.7909°E, its geography is dominated by the Kosi River, which flows nearby and significantly influences the local environment. The surrounding landscape is primarily agricultural, characterized by intensely cultivated rice paddies and wheat fields, typical of the region. Beldaur’s elevation is low, averaging around 45 meters above sea level, contributing to limited atmospheric dispersion of pollutants. The urban character is distinctly rural-urban fringe; Beldaur serves as a market town for surrounding villages, experiencing a gradient of development. While not directly within a major industrial belt, the increasing use of agricultural machinery and brick kilns in the wider district contribute to particulate matter emissions. The proximity to the Kosi also introduces humidity, which can trap pollutants and exacerbate air quality issues. The lack of substantial natural barriers to wind flow means that regional pollution sources can readily impact Beldaur, and local emissions are not easily flushed away. This combination of factors creates a challenging environment for maintaining clean air.

Beldaur’s air quality follows a distinct seasonal pattern. The post-monsoon period, from October to November, often sees the worst conditions. Stagnant air, coupled with the burning of crop residue after the harvest, leads to a significant spike in particulate matter. Temperature inversions during cooler mornings trap pollutants near the ground. The winter months (December-February) maintain elevated pollution levels due to continued biomass burning for heating and cooking, and reduced atmospheric mixing. The pre-monsoon season (March-May) brings increasing temperatures and dust storms, worsening particulate matter concentrations. The monsoon season (June-September) offers a temporary respite. Heavy rainfall effectively washes pollutants from the air, and increased humidity suppresses dust. However, increased cloud cover can also contribute to localized pollution build-up. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor activity during October-November and March-May. Avoiding peak hours and wearing masks can offer some protection. The monsoon months generally provide the most favourable conditions for outdoor activity, but vigilance regarding waterborne diseases is crucial.