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Srikhanda, a small town in West Bengal, India, sits at coordinates 23.5981°N, 88.0799°E, within the fertile plains of the Ganges Delta. Its relatively low elevation, typical of the region, contributes to the potential for stagnant air masses. The surrounding landscape is predominantly agricultural, characterized by rice paddies and jute cultivation, interspersed with small settlements. Srikhanda’s position isn’t directly adjacent to major industrial belts like those found further south around Kolkata, but it’s within reach of regional transport corridors that contribute to background pollution levels. The Bhagirathi River, a major distributary of the Ganges, flows nearby, influencing local humidity and potentially trapping pollutants during temperature inversions. The urban-rural gradient is quite sharp; Srikhanda itself is a concentrated settlement, quickly giving way to agricultural land. This proximity to agricultural practices introduces seasonal biomass burning – post-harvest crop residue burning – as a significant localised source of particulate matter. The town’s limited infrastructure and reliance on biomass fuels for cooking and heating further exacerbate air quality challenges. Understanding this interplay between geography, land use, and local practices is crucial for addressing Srikhanda’s air pollution profile.

Srikhanda’s air quality follows a distinct seasonal pattern. The post-monsoon months, October to November, typically see the worst conditions. The cessation of monsoon rains removes the natural cleansing effect of precipitation, while cooler temperatures lead to temperature inversions, trapping pollutants near the ground. Simultaneously, this period coincides with widespread post-harvest crop residue burning, significantly increasing particulate matter concentrations. December to February brings slightly improved conditions due to increased wind speeds, but persistent temperature inversions can still cause pollution build-up. The pre-monsoon months, March to May, witness rising temperatures and dust storms, contributing to increased levels of coarser particulate matter. The monsoon season, June to September, offers the cleanest air, as heavy rainfall washes away pollutants and high humidity suppresses dust. However, increased cloud cover can also exacerbate the effects of localised emissions. Sensitive groups – children, the elderly, and those with respiratory conditions – should avoid strenuous outdoor activity during October-November. During the monsoon, while air is cleaner, damp conditions can trigger fungal growth, potentially affecting respiratory health. Monitoring local weather patterns is key to managing exposure.