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Sabalpur, a small town in Bihar, India, sits at coordinates 25.6053°N, 85.1835°E, nestled within the fertile plains of the Ganges River basin. With a population of approximately 18,810, Sabalpur’s geography is predominantly flat, characteristic of the Indo-Gangetic Plain. The surrounding landscape is intensely agricultural, dominated by rice paddies and wheat fields, typical of the region. The town’s elevation is relatively low, contributing to potential temperature inversions that trap pollutants. The Phalgu River, a tributary of the Ganges, flows nearby, influencing local humidity and potentially contributing to localized air stagnation. Sabalpur isn’t a major industrial hub, but regional brick kilns and small-scale agricultural processing contribute to particulate matter emissions. The urban-rural gradient is sharp; the town is surrounded by villages engaged in subsistence farming. This proximity means seasonal agricultural burning, particularly after harvests, significantly impacts local air quality. Dust from unpaved roads and construction activities also adds to the particulate load. The lack of significant wind corridors through the flat terrain exacerbates pollution build-up, making Sabalpur particularly vulnerable to air quality issues linked to regional activities and meteorological conditions. Its location within the densely populated Bihar plain means it’s susceptible to transboundary pollution as well.

Sabalpur experiences a distinct seasonal air quality pattern. The post-monsoon season (October-November) often sees the worst conditions. The receding monsoon leaves behind stagnant air, coupled with increased agricultural burning to clear fields after the harvest. Temperature inversions become common during cooler mornings, trapping pollutants near the ground. Winter (December-February) maintains poor air quality, with continued burning for warmth and limited atmospheric mixing. Fog further exacerbates particulate matter concentrations. The pre-monsoon season (March-May) brings rising temperatures and dust storms, increasing coarse particulate matter. However, occasional pre-monsoon showers can offer temporary relief. The monsoon season (June-September) generally provides the cleanest air. Heavy rainfall effectively washes away pollutants, and increased humidity causes particles to settle. However, increased moisture can also promote mold growth indoors. Sensitive groups – children, the elderly, and those with respiratory conditions – should avoid prolonged outdoor activity during October-February. March-May requires caution due to dust. The monsoon offers the most favourable conditions for outdoor activities, but indoor dampness needs managing. Monitoring local conditions is crucial, as weather patterns can shift rapidly.