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Pupri, a small town in the Muzaffarpur district of Bihar, India, occupies a relatively flat expanse of the Indo-Gangetic Plain. Situated at coordinates 26.4708°N, 85.7031°E, its elevation is typical for the region, hovering around 52 meters above sea level. This low-lying terrain contributes to limited natural air dispersion, exacerbating pollution build-up. The surrounding landscape is predominantly agricultural, characterized by intensive farming of rice, wheat, and sugarcane. Pupri is not directly adjacent to a major river, though it lies within the broader watershed of the Burhi Gandak river system, which influences local humidity and can contribute to stagnant air conditions during certain periods. The urban-rural gradient is sharp; Pupri itself is a relatively small settlement, quickly transitioning to rural farmland. While not a major industrial hub, the increasing use of agricultural machinery and small-scale brick kilns in the surrounding areas contribute to particulate matter emissions. The town’s position within the densely populated Bihar plain means it’s susceptible to regional pollution transport from larger urban centres like Muzaffarpur and Patna. Dust from unpaved roads and construction activities further degrades local air quality, particularly during the drier months. The lack of significant topographical features hinders the flushing out of pollutants.

Pupri experiences a distinct seasonal air quality pattern dictated by the monsoon and post-monsoon climate. The monsoon season (June-September) generally brings temporary relief, as rainfall washes away particulate matter and increased humidity suppresses dust. However, high humidity can also trap pollutants near the ground. October-November sees a deterioration in air quality as the monsoon retreats, agricultural burning increases after the harvest, and cooler temperatures lead to temperature inversions, trapping pollutants. This period is often the most challenging for respiratory health. December-February are characterized by dry, cold conditions, with frequent fog and stagnant air, leading to a build-up of particulate matter from household combustion (cooking stoves) and vehicular emissions. Avoid prolonged outdoor activity during these months, especially for children, the elderly, and those with pre-existing respiratory conditions. March-May brings rising temperatures and increased dust from agricultural activities and construction, contributing to elevated particulate matter levels. While wind speeds may increase, they are often insufficient to fully disperse pollutants. Prioritize indoor air purification and limit strenuous outdoor exercise during peak heat and dust periods. Sensitive individuals should consider wearing masks.