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Mārgrām, a small city nestled within the Murshidabad district of West Bengal, India, occupies a relatively flat, low-lying terrain at approximately 16 meters above sea level (coordinates 24.1512, 87.8422). Its geography is fundamentally shaped by its location within the Ganges Delta, a vast alluvial plain formed by the confluence of major rivers. The Bhagirathi River, a major distributary of the Ganges, flows nearby, influencing local humidity and contributing to the region’s fertile agricultural lands. Surrounding Mārgrām is a predominantly rural landscape characterized by intensive rice cultivation and jute farming, typical of the Bengal delta. The urban-rural gradient is sharp, with Mārgrām serving as a market and service centre for the surrounding agricultural communities. While not a major industrial hub itself, Mārgrām’s proximity to larger industrial areas further south, along the Hooghly River, means it can experience pollutant transport. The flat topography and limited natural ventilation contribute to the potential for pollutant accumulation, particularly during periods of calm weather. Dust from agricultural activities and brick kilns, common in the region, also contribute to particulate matter levels. The deltaic environment also means a high water table, impacting dispersion of pollutants.

Mārgrām’s air quality follows a distinct seasonal pattern dictated by the monsoon and post-monsoon weather systems. The pre-monsoon months of March to May are typically the worst for air quality. Rising temperatures create unstable atmospheric conditions, but limited rainfall means pollutants accumulate. Dust from agricultural preparations and road construction exacerbates particulate matter. The arrival of the monsoon in June brings a temporary respite, as heavy rainfall effectively washes pollutants from the air. However, increased humidity can also foster mold growth, impacting respiratory health. Post-monsoon, from October to November, sees a gradual deterioration as temperatures cool and wind speeds decrease, trapping pollutants. This period often coincides with crop residue burning, significantly worsening air quality. Winter, from December to February, is characterized by temperature inversions – a layer of warm air trapping cooler, polluted air near the ground – leading to stagnant conditions and high pollutant concentrations. Sensitive groups, including children, the elderly, and those with respiratory conditions, should limit outdoor activity during March-May and October-February. Monitoring local weather patterns and avoiding peak pollution times is crucial for protecting health.