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Rangra, a small town in the Muzaffarpur district of Bihar, India, sits within the Indo-Gangetic Plain, a vast and fertile expanse. Located at approximately 25.3803°N latitude and 87.1866°E longitude, Rangra’s terrain is characteristically flat, typical of this alluvial region formed by the sediment deposition of the Ganges and its tributaries. The town’s elevation is relatively low, contributing to limited atmospheric dispersion of pollutants. Surrounding Rangra are intensely cultivated agricultural lands, primarily dedicated to rice, wheat, and sugarcane cultivation. This agricultural activity, while vital to the local economy, introduces particulate matter from crop residue burning and fertilizer application. The Burhi Gandak river flows nearby, influencing local humidity and potentially trapping pollutants during temperature inversions. Rangra’s position isn’t near major industrial belts, but regional brick kilns and small-scale industries contribute to background pollution levels. The urban-rural gradient is pronounced; Rangra itself is a relatively small settlement, but is increasingly connected to larger urban centres like Muzaffarpur, leading to increased vehicular traffic and associated emissions. This geographical setting, combined with regional weather patterns, creates a unique air quality profile for Rangra, making it susceptible to seasonal pollution spikes.

Rangra experiences a distinct seasonal air quality pattern dictated by the monsoon and post-monsoon periods. The summer months (April-June) bring high temperatures and stagnant air, exacerbating dust and particulate matter from agricultural activities and road traffic. This is often the period of poorest air quality. The arrival of the monsoon (July-September) provides temporary relief, as rainfall washes away pollutants and increased humidity suppresses dust. However, the monsoon can also lead to localised flooding, increasing mould spore concentrations. Post-monsoon (October-November) is often the worst period for air quality, coinciding with the burning of crop residue after the harvest, creating a dense haze. Temperature inversions become common during the cooler, drier winter months (December-February), trapping pollutants near the ground and leading to prolonged periods of poor air quality. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor activity during October-November and December-February. Avoiding peak traffic hours and using masks when outdoors are recommended. Monitoring local weather reports for inversion conditions is also advisable. The monsoon months generally offer the most favourable conditions for outdoor activity.