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Sherghāti is situated within the fertile expanse of the Middle Gangetic Plain in Bihar's Gaya district. The town is characterized by a predominantly flat topography, typical of the alluvial landscapes that define this region of eastern India. Its urban character is a blend of a bustling commercial hub and a rural agricultural center, serving as a vital node for the surrounding farming communities. A defining geographic feature is its strategic position along the Grand Trunk Road, which brings a constant stream of heavy vehicular traffic, introducing significant concentrations of nitrogen oxides and particulate matter into the local atmosphere. The surrounding landscape is dominated by intensive agriculture, where the cycle of crop cultivation directly influences air quality through the periodic burning of crop residues. With minimal natural barriers or significant elevation changes, the town is susceptible to the stagnation of pollutants, particularly when wind speeds drop. While not directly on a major river, the high water table and humidity of the plains facilitate the formation of secondary aerosols. The urban–rural gradient is narrow, meaning that pollution from agricultural burning quickly permeates the residential core, while urban emissions drift into the nearby fields. This synergy between highway transport and agrarian practices creates a unique pollution profile, where the flat terrain allows pollutants to linger and migrate across the plains, making the town's air quality highly dependent on regional meteorological patterns and the seasonal rhythms of the vast rural hinterland nearby.

The air quality in Sherghāti follows a distinct seasonal cycle driven by the monsoon and temperature fluctuations. During the scorching summer months, high temperatures and dry winds elevate levels of coarse mineral dust, often exacerbated by the arid conditions of the surrounding plains. As the southwest monsoon arrives between June and September, the air undergoes a dramatic cleansing; heavy rainfall washes away suspended particulates, leading to the cleanest air of the year. However, the transition to winter brings a sharp decline in air quality. From November to February, the region experiences strong temperature inversions, where a layer of warm air traps cooler, polluted air close to the ground. This period coincides with the burning of paddy straw and the increased use of biomass for heating, leading to dense smog and high particulate concentrations. These winter months are the most hazardous, particularly for children and the elderly, who should limit outdoor exertion during the early morning hours when fog traps pollutants. Spring sees a gradual improvement as temperatures rise, though dust storms remain a concern. For sensitive groups, the peak pollution window from late autumn to mid-winter requires the use of masks and air purification indoors. By monitoring the wind direction and avoiding the smoggy dawn, residents can better manage their exposure. The interplay of the monsoon's wash and the winter's stagnation defines a year of respiratory challenges and brief periods of true atmospheric clarity.