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Dhobauli, nestled in the state of Bihar, India, occupies a geographically significant position within the fertile Gangetic plains. Located at approximately 25.4008° N, 86.1885° E, the town’s terrain is predominantly flat, characteristic of the Indo-Gangetic alluvial plain. The elevation is relatively low, contributing to a tendency for pollutants to accumulate, particularly during periods of atmospheric stability. Dhobauli’s proximity to the Ganges River, though providing a vital water source, can also influence local air quality; moisture from the river can trap particulate matter under certain meteorological conditions. The surrounding landscape is a mosaic of agricultural fields – primarily rice and wheat cultivation – interspersed with small villages and scattered rural settlements, creating a gradual urban-rural gradient. This agricultural activity, while economically crucial, contributes to seasonal air pollution through the burning of crop residue after harvest. Further afield, Bihar’s industrial belt, concentrated around cities like Patna and Muzaffarpur, introduces regional pollution sources that can impact Dhobauli’s air quality. The town’s location within a densely populated region means it’s susceptible to transboundary pollution transport, with pollutants originating from larger urban centers potentially affecting local air quality. The flat topography and limited natural barriers exacerbate this issue, hindering the dispersion of pollutants and increasing the likelihood of ground-level ozone formation during warmer months.

Dhobauli’s air quality experiences a distinct seasonal cycle heavily influenced by regional weather patterns and agricultural practices. The pre-monsoon season (March-May) typically witnesses the poorest air quality. High temperatures and stagnant air, often accompanied by temperature inversions, trap pollutants close to the ground. The burning of crop residue following the winter harvest significantly contributes to particulate matter pollution during this period. The monsoon season (June-September) brings a welcome respite, as increased rainfall and strong winds effectively flush out pollutants, leading to a noticeable improvement in air quality. However, heavy rainfall can also lead to increased humidity, which can exacerbate respiratory issues for some individuals. The post-monsoon season (October-November) sees a gradual return to poorer air quality as temperatures drop and wind speeds decrease, although not as severe as the pre-monsoon period. The winter months (December-February) are generally characterized by cooler temperatures and frequent fog, which further restricts atmospheric mixing and traps pollutants, particularly in the mornings. Sensitive groups, including children, the elderly, and individuals with pre-existing respiratory conditions, should exercise caution during the pre-monsoon and winter months, limiting outdoor activities during peak pollution times. Maintaining indoor air quality through ventilation and air purifiers can also be beneficial. The monsoon season offers the most favourable period for outdoor activities, but awareness of humidity-related health concerns remains important.