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Sanrh Majhgawan, a small urban centre in Bihar, India, sits at coordinates 24.6845°N, 85.3650°E, within the Indo-Gangetic Plain. This region is characterised by flat, fertile alluvial terrain formed by the deposition of sediments from the Ganges and its tributaries. The town’s elevation is relatively low, contributing to potential temperature inversions that trap pollutants. Surrounding Sanrh Majhgawan is a predominantly agricultural landscape, dominated by rice and wheat cultivation, with increasing pockets of brick kilns and small-scale industrial activity. The proximity to the Ganges River, while providing a vital water source, also influences local humidity and can contribute to fog formation during cooler months, exacerbating air pollution. The urban-rural gradient is sharp; the town itself is densely populated, while the immediate surroundings are largely rural farmland. This creates a dynamic where agricultural practices, including crop residue burning, directly impact air quality within the urban centre. The lack of significant natural barriers to wind flow means pollutants can accumulate easily, particularly during periods of calm weather. The town’s location within the heavily populated and industrialised state of Bihar means it is susceptible to regional pollution transport. Understanding this geographic context is crucial for addressing Sanrh Majhgawan’s air quality challenges.

Sanrh Majhgawan experiences a distinct seasonal air quality pattern. The post-monsoon season (October-November) is typically the worst, coinciding with the burning of crop residue after the harvest and the onset of cooler temperatures which lead to temperature inversions, trapping pollutants near the ground. Diwali celebrations in this period further worsen conditions due to firecracker emissions. Winter (December-February) maintains poor air quality, with persistent fog and low wind speeds hindering dispersion. The pre-monsoon season (March-May) sees a gradual improvement as temperatures rise and winds pick up, though dust storms are common, increasing particulate matter. The monsoon season (June-September) generally offers the cleanest air, as rainfall washes away pollutants and high humidity suppresses dust. However, increased cloud cover can also contribute to temperature inversions. Sensitive groups – children, the elderly, and those with respiratory conditions – should avoid strenuous outdoor activity during October-February. March-May requires caution due to dust. Monitoring wind direction is vital; pollutants often drift from regional sources. Staying indoors during peak pollution periods and using air purifiers are recommended preventative measures. Local meteorological conditions heavily dictate the severity of pollution episodes.