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Sonāmukhi, nestled within the eastern Indian state of West Bengal, occupies a relatively flat, low-lying terrain characteristic of the Gangetic Delta. Located at approximately 23.3000°N latitude and 87.4200°E longitude, the city sits within the broader Murshidabad district, a region historically significant for its agricultural productivity and, increasingly, its industrial development. The surrounding landscape is dominated by fertile alluvial plains, intensely cultivated with rice paddies, jute fields, and other crops. The Bhagirathi River, a major distributary of the Ganges, flows nearby, influencing local humidity and potentially contributing to localised fog formation during cooler months. Sonāmukhi’s position isn’t directly within a major industrial belt, but it’s increasingly affected by regional industrial emissions from nearby areas. The urban-rural gradient is pronounced; the city itself is a relatively small urban centre surrounded by a vast expanse of rural agricultural land. This proximity means that agricultural practices, including seasonal crop burning, significantly impact local air quality. The flat topography limits natural dispersion of pollutants, exacerbating air quality issues, particularly during periods of calm weather. Dust from unpaved roads and construction activities also contributes to particulate matter concentrations. The city’s location within the deltaic region makes it vulnerable to high humidity and stagnant air conditions.

Sonāmukhi experiences a tropical climate with distinct wet and dry seasons, profoundly influencing its air quality. The pre-monsoon months of April and May bring scorching heat and dry winds, leading to increased dust and particulate matter from construction and agricultural activities. This period often sees a deterioration in air quality, with conditions worsening as temperatures rise. The arrival of the monsoon in June offers temporary relief, as rainfall washes away pollutants and increases humidity, suppressing dust. However, increased moisture can also foster fungal growth, impacting respiratory health. Post-monsoon, from September to November, sees a gradual return of drier conditions and a resurgence of pollution, exacerbated by crop residue burning after the harvest. This is often the most challenging period for air quality. Winter, from December to February, brings cooler temperatures and frequent temperature inversions, trapping pollutants near the ground. Calm winds and fog further worsen the situation, leading to poor visibility and increased respiratory problems. Sensitive groups – children, the elderly, and those with pre-existing respiratory conditions – should limit outdoor activity during the pre-monsoon and winter months. Monitoring local conditions and using appropriate respiratory protection is advisable.