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Dhanupra, a small town in the Gaya district of Bihar, India, sits at coordinates 25.6992°N, 86.4716°E. The landscape is characteristic of the Indo-Gangetic Plain – a flat, fertile alluvial plain formed by the Ganges and its tributaries. Dhanupra’s elevation is relatively low, contributing to limited atmospheric dispersion of pollutants. The Phalgu River, a sacred tributary of the Ganges, flows nearby, influencing local humidity and potentially trapping pollutants during temperature inversions. Surrounding Dhanupra are predominantly agricultural lands, primarily dedicated to rice and wheat cultivation. The use of agricultural practices, including crop residue burning, significantly impacts local air quality. While Dhanupra itself isn’t heavily industrialised, its proximity to Gaya, a regional hub with some industrial activity, means it’s susceptible to regional pollution transport. The urban-rural gradient is sharp; Dhanupra is a relatively small settlement embedded within a largely rural agricultural matrix. This means localised sources – brick kilns, domestic fuel burning, and vehicle emissions – have a disproportionately large impact. Dust from unpaved roads and agricultural fields is also a significant contributor to particulate matter. The flat terrain hinders natural ventilation, exacerbating pollution build-up, particularly during calmer weather conditions.

Dhanupra experiences a distinct seasonal air quality pattern. The post-monsoon period, from October to November, is often the most polluted. The receding monsoon leaves behind stagnant air, while agricultural burning of crop residue after the harvest peaks during this time, releasing substantial amounts of particulate matter and other pollutants. Winter (December-February) brings cooler temperatures and frequent temperature inversions, trapping pollutants near the ground. Fog further reduces visibility and exacerbates respiratory issues. March and April see rising temperatures and dust storms, increasing particulate matter concentrations. The pre-monsoon season (May-June) is generally hotter and drier, with some relief from dust due to occasional thunderstorms. The monsoon season (July-September) typically offers the cleanest air, as rainfall washes away pollutants and increased humidity suppresses dust. However, increased cloud cover can also lead to temperature inversions. Sensitive groups – children, the elderly, and those with respiratory conditions – should avoid prolonged outdoor activity during October-November and December-February. Monitoring local conditions and limiting strenuous exercise on poor air quality days is crucial. The monsoon offers the most favourable conditions for outdoor activities.