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Mālancha, a small town in the Murshidabad district of West Bengal, India, occupies a relatively flat, low-lying area within the Ganges Delta. Situated at coordinates 24.6660°N, 87.9220°E, its elevation is minimal, making it susceptible to localised flooding during the monsoon season. The surrounding landscape is predominantly agricultural, characterised by intensely cultivated rice paddies and jute fields, typical of the region. The Bhagirathi River, a major distributary of the Ganges, flows nearby, influencing local humidity and potentially contributing to stagnant air conditions. Mālancha’s urban character is that of a developing town, transitioning from a primarily rural economy. While not a major industrial hub itself, its proximity to larger industrial areas further south, along the Hooghly River, means it can experience transboundary pollution. The urban-rural gradient is sharp, with agricultural land immediately bordering the town’s periphery. This proximity to agricultural practices introduces seasonal biomass burning, a significant contributor to particulate matter. The flat terrain offers little natural dispersion for pollutants, and the dense population, though small at 16,918, concentrates emissions. The deltaic environment, combined with regional weather patterns, creates a complex interplay affecting air quality.

Mālancha’s air quality follows a distinct seasonal pattern. The post-monsoon period, from October to November, often sees a build-up of pollutants due to stagnant air and cooler temperatures promoting temperature inversions, trapping emissions near the ground. This is exacerbated by the burning of crop residue after the harvest. December and January represent the coolest months, with increased use of solid fuels for heating, further degrading air quality. The pre-monsoon months, March to May, are typically the worst, with rising temperatures and dry winds carrying dust and pollutants. The monsoon season, from June to September, offers temporary relief. Heavy rainfall effectively washes particulate matter from the air, and increased humidity suppresses dust. However, the increased cloud cover can also trap pollutants at lower altitudes. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor activity during the pre-monsoon and post-monsoon periods. October, November, March, and April are particularly challenging. During the monsoon, while air is cleaner, increased humidity can trigger respiratory issues in some individuals. Monitoring local weather forecasts and avoiding strenuous activity on poor air quality days is crucial.