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Mahraurh, a small city nestled within the state of Bihar, India, occupies a geographically significant position in the Gangetic plains. Located at coordinates 25.2378°N, 84.1017°E, the city’s terrain is predominantly flat alluvial land, characteristic of the region formed by the deposition of sediments from the Ganges River. The surrounding landscape is intensely agricultural, dominated by rice paddies and wheat fields, reflecting Bihar’s agrarian economy. Mahraurh’s elevation is relatively low, contributing to limited atmospheric dispersion of pollutants. The proximity to the Ganges River, while vital for irrigation and livelihoods, also introduces humidity which can exacerbate particulate matter suspension. While not directly within a major industrial belt, the increasing presence of brick kilns and small-scale industries in the surrounding districts contributes to localised emissions. The urban-rural gradient is sharp; Mahraurh itself is a relatively compact urban centre, quickly transitioning to rural farmland. This proximity means agricultural practices, including crop residue burning, significantly impact local air quality. The city’s location within the Indo-Gangetic Plain, known for its stagnant air masses, further compounds pollution challenges, trapping pollutants and hindering their dispersal. This geographical setting creates a unique vulnerability to air pollution, demanding focused mitigation strategies.

Mahraurh experiences a distinct seasonal air quality pattern dictated by the monsoon and post-monsoon climate. The summer months (April-June) bring high temperatures and dry winds, leading to increased dust suspension and a build-up of particulate matter from construction and road traffic. This is often the period of poorest air quality. The arrival of the monsoon in July-September offers temporary relief, as rainfall washes away pollutants and increases humidity, suppressing dust. However, increased cloud cover can also lead to temperature inversions, trapping pollutants near the ground. Post-monsoon (October-November) sees a resurgence of pollution, driven by crop residue burning after the harvest and the return of drier conditions. This period is particularly hazardous. Winter (December-February) brings cooler temperatures and frequent fog, exacerbating particulate matter concentrations and reducing visibility. The fog traps pollutants, creating a stagnant layer of smog. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor activity during October-November and December-February. Avoiding peak hours near roadways and construction sites is advisable year-round. Monitoring local conditions and using appropriate respiratory protection when necessary are crucial for safeguarding health.