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Belpukur, a small urban centre in West Bengal, India, sits at coordinates 21.9851°N, 88.2125°E, within the Ganges Delta region. The terrain is remarkably flat, characteristic of the deltaic plains, with an elevation barely above sea level. This low-lying geography significantly influences air quality, hindering dispersion of pollutants. Belpukur is situated approximately 15km east of Kolkata, a major metropolitan area and industrial hub, meaning it experiences a degree of downwind pollution transport. The surrounding landscape is dominated by intensely cultivated agricultural land, primarily rice paddies, which contribute to localised emissions of methane and ammonia, precursors to particulate matter formation. The proximity to the Hooghly River, a major distributary of the Ganges, introduces humidity and can exacerbate the formation of secondary pollutants. The urban-rural gradient is relatively sharp; Belpukur itself is a concentrated settlement, transitioning quickly to agricultural fields. This proximity to both industrial activity and intensive agriculture, coupled with the flat terrain and limited natural ventilation, creates a challenging environment for maintaining good air quality. The delta’s complex hydrological system also influences local weather patterns, impacting pollutant dispersal.

Belpukur’s air quality follows a distinct seasonal pattern dictated by the monsoon and post-monsoon cycles. The pre-monsoon months (March-May) are typically the worst, with rising temperatures and stagnant air leading to increased concentrations of particulate matter from construction, road dust, and agricultural burning. May is often particularly challenging. The arrival of the monsoon (June-September) brings temporary relief, as rainfall washes away pollutants and increased humidity suppresses dust. However, the monsoon can also lead to localised flooding, increasing mould spore counts and impacting respiratory health. Post-monsoon (October-November) sees a resurgence of pollution as temperatures drop and wind speeds decrease, trapping pollutants. This period is often marked by increased biomass burning from agricultural practices. Winter (December-February) brings cooler temperatures and frequent temperature inversions, trapping pollutants near the ground and leading to poor visibility. Fog formation further exacerbates the issue. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor activity during the pre-monsoon and post-monsoon periods. Maintaining good ventilation indoors and using air purifiers are recommended during peak pollution times.