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Mādhopur, a small town in the Saran district of Bihar, India, occupies a relatively flat expanse of the Indo-Gangetic Plain at approximately 26.3400°N, 84.4500°E. Its elevation, typical of the region, is low-lying, contributing to limited atmospheric dispersion of pollutants. The surrounding landscape is predominantly agricultural, characterized by intensive rice and wheat cultivation. This agricultural activity, while vital to the local economy, introduces particulate matter from crop residue burning and fertilizer application. The town’s proximity to the Gandak River, a major tributary of the Ganges, influences local humidity and can contribute to the formation of fog during cooler months, trapping pollutants near the ground. Mādhopur isn’t situated within a major industrial belt, but regional brick kilns and small-scale industries contribute to localized emissions. The urban-rural gradient is pronounced; Mādhopur serves as a market centre for surrounding villages, leading to increased vehicular traffic and associated exhaust fumes. The lack of substantial green cover within the town itself further exacerbates air quality challenges, reducing the natural filtration of airborne particles. The flat terrain hinders natural ventilation, making Mādhopur susceptible to pollutant build-up, particularly during periods of calm weather.

Mādhopur’s air quality follows a distinct seasonal pattern. October to February typically sees the poorest air, driven by cooler temperatures, frequent temperature inversions, and increased biomass burning after the harvest season. Fog formation during these months further traps pollutants, leading to reduced visibility and respiratory irritation. March and April bring some improvement as temperatures rise and winds pick up, dispersing pollutants, but dust storms originating from the west can temporarily worsen conditions. The arrival of the monsoon in June and July offers significant relief, as rainfall effectively washes away particulate matter and increased humidity suppresses dust. However, increased cloud cover can also lead to stagnant air. August and September maintain relatively cleaner air, though localised flooding can disrupt transportation and increase reliance on diesel generators, contributing to localised emissions. Sensitive groups – children, the elderly, and those with pre-existing respiratory conditions – should avoid prolonged outdoor activity during October-February. During the monsoon, precautions against waterborne diseases are paramount, but air quality is generally favourable. The post-monsoon period requires vigilance as agricultural burning resumes.