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Bandwār, a small town in the Gaya district of Bihar, India, occupies a relatively flat section of the Indo-Gangetic Plain. Situated at coordinates 25.5093°N, 86.1595°E, its elevation is modest, contributing to limited natural air dispersion. The surrounding landscape is predominantly agricultural, characterized by intensive farming of rice, wheat, and pulses. This agricultural activity, while vital to the local economy, introduces particulate matter from crop residue burning and fertilizer use. Bandwār’s position within the broader Gangetic Plain means it’s susceptible to stagnant air masses, particularly during the winter months. The Phalgu River, a tributary of the Ganges, flows nearby, but its influence on local air quality is limited due to the river’s seasonal flow variations and the prevailing wind patterns. The town’s urban-rural gradient is sharp; Bandwār itself is a concentrated settlement amidst a largely rural backdrop. While not a major industrial hub, the increasing presence of brick kilns and small-scale industries in the surrounding areas contributes to localised pollution. The proximity to Gaya, a larger city, also means Bandwār experiences some spillover effects from regional emissions. The flat terrain hinders the flushing out of pollutants, exacerbating air quality challenges.

Bandwār’s air quality follows a distinct seasonal pattern. The post-monsoon period, from October to November, sees a significant deterioration due to the practice of agricultural stubble burning, combined with cooler temperatures and the onset of temperature inversions which trap pollutants near the ground. These conditions create a haze that lingers for weeks. December and January represent the worst months for air quality, with consistently poor conditions due to continued stubble burning, low wind speeds, and frequent fog. Sensitive individuals – children, the elderly, and those with respiratory conditions – should limit outdoor activity during these months. The arrival of the monsoon in June and July brings a temporary respite, as rainfall washes away pollutants and increased humidity suppresses dust. However, increased moisture can also promote mold growth, impacting respiratory health. March to May sees rising temperatures and dust storms, leading to increased particulate matter concentrations, though generally less severe than the winter months. Avoiding prolonged outdoor exertion during peak heat and dust events is advisable. Overall, the best time for outdoor activities is typically immediately following the monsoon rains, though vigilance regarding localised sources of pollution remains crucial.