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Sidhapa, a small urban centre in the Bihar plains of India (26.5355°N, 86.3355°E), occupies a relatively flat alluvial terrain typical of the Gangetic basin. With a population of approximately 20,075, the town’s geography is profoundly shaped by its proximity to agricultural lands and the broader river systems of the region. The land is low-lying, generally below 70 meters elevation, contributing to limited natural dispersion of pollutants. Sidhapa isn’t directly on a major riverbank, but benefits from the groundwater recharge and irrigation provided by the surrounding network of smaller tributaries and canals linked to the larger Gandak and Koshi rivers. The surrounding landscape is dominated by intensely cultivated farmland, primarily rice and wheat, with pockets of deciduous forests further afield. This agricultural intensity contributes to seasonal biomass burning, a significant source of particulate matter. The urban-rural gradient is sharp; Sidhapa is a concentrated settlement amidst a largely agrarian hinterland. Industrial activity is limited within Sidhapa itself, but regional industrial belts, particularly around Muzaffarpur and Patna, can influence air quality through long-range transport of pollutants. The flat topography and frequent calm wind conditions exacerbate the concentration of emissions, making Sidhapa particularly vulnerable to localised and regional air pollution events.

Sidhapa experiences a distinct seasonal air quality pattern dictated by the monsoon and post-monsoon climate. The monsoon season (June-September) generally offers the cleanest air, as heavy rainfall effectively washes away particulate matter and suppresses dust. However, increased humidity can also foster mould growth, impacting respiratory health. October-November sees a deterioration in air quality as post-monsoon calm conditions and agricultural residue burning (post-harvest) combine to create stagnant air and high levels of particulate pollution. This is often the most challenging period for those with respiratory ailments. Winter (December-February) brings cooler temperatures and frequent temperature inversions, trapping pollutants near the ground, particularly from domestic fuel burning (wood and dung). Fog further reduces visibility and exacerbates respiratory issues. March-May is characterised by rising temperatures and increasing dust levels due to drier conditions and agricultural activities. Strong winds can offer temporary relief, but overall, air quality tends to worsen as the dry season progresses. Sensitive groups – children, the elderly, and those with pre-existing respiratory or cardiovascular conditions – should limit outdoor activity during the post-monsoon and winter months, and consider using air purifiers indoors.