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Bhagwāngola, a small town in the Murshidabad district of West Bengal, India, sits at coordinates 24.3485°N, 88.3243°E. The landscape is predominantly flat, characteristic of the Ganges Delta, with an elevation barely above sea level. This low-lying terrain makes the area susceptible to localised flooding during the monsoon season. The town is situated relatively close to the Bhagirathi River, a major distributary of the Ganges, influencing local humidity and potentially contributing to atmospheric moisture. Surrounding Bhagwāngola is a largely agricultural landscape, dominated by rice cultivation, jute farming, and other seasonal crops. While not a major industrial hub itself, the region is within reach of larger industrial areas further south towards Kolkata, and transport corridors can funnel pollutants. The urban-rural gradient is quite sharp; Bhagwāngola represents a concentrated settlement within a predominantly rural backdrop. This proximity to agricultural practices introduces potential sources of particulate matter from crop residue burning and fertilizer use. The lack of significant topographical features hinders natural dispersion of pollutants, meaning emissions tend to linger locally, impacting air quality. The town’s position within the Indo-Gangetic Plain, known for its stagnant air masses, exacerbates this issue.

Bhagwāngola experiences a distinct seasonal air quality pattern dictated by the monsoon and post-monsoon cycles. The pre-monsoon months of March to May are typically the worst for air quality. Rising temperatures create unstable atmospheric conditions, but limited wind speeds allow pollutants from agricultural burning and local sources to accumulate. The arrival of the monsoon in June-September brings a temporary respite. Heavy rainfall effectively washes particulate matter from the air, and increased humidity suppresses dust. However, the monsoon can also lead to increased fungal spores and dampness-related respiratory issues. Post-monsoon, from October to November, sees a resurgence of pollution. Cooler temperatures and calmer winds create temperature inversions, trapping pollutants near the ground. This period coincides with increased crop residue burning after the harvest. Winter, December to February, brings consistently poor air quality. Low temperatures, fog, and stagnant air exacerbate the effects of emissions from household cooking (biomass burning) and vehicular traffic. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor activity during March-May and October-February. Avoiding peak hours and wearing masks can offer some protection.