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Jhalidā, nestled in the Purba Bardhaman district of West Bengal, India, occupies a geographically significant position within the fertile Gangetic plains. Located at approximately 23.37°N, 85.97°E, the town’s terrain is predominantly flat, characteristic of the alluvial soil deposits left by the Hooghly River, a major distributary of the Ganges. The surrounding landscape is overwhelmingly agricultural, a patchwork of rice paddies, jute fields, and vegetable farms, contributing to a strong rural-urban gradient. Jhalidā itself is a relatively small urban centre, exhibiting a traditional Bengali town character with narrow lanes and densely packed residential areas. Its proximity to the Hooghly River, though providing a vital water source, also introduces a potential pathway for pollutants to accumulate, particularly during periods of low flow. The region’s climate is subtropical, with hot, humid summers and mild winters. While Jhalidā isn't directly adjacent to major industrial belts, it lies within a broader agricultural zone that utilizes fertilizers and pesticides, and is within reach of industrial activity further north towards Durgapur. The flat topography and prevailing wind patterns can lead to stagnant air conditions, especially during cooler months, hindering the dispersion of pollutants originating from both local and regional sources. The urban footprint is compact, with limited green spaces, further exacerbating the potential for localized air quality issues. The gradual transition from agricultural land to urban development influences the types and sources of pollutants impacting the town’s air.

Jhalidā’s air quality experiences a distinct seasonal cycle heavily influenced by the region’s monsoon climate. The monsoon season, typically spanning June to September, brings relief from accumulated pollutants as strong winds and frequent rainfall effectively cleanse the atmosphere. However, the preceding pre-monsoon months (April-May) often witness a significant deterioration in air quality. High temperatures, stagnant air, and the accumulation of dust and agricultural emissions create conditions ripe for pollution build-up. Temperature inversions, common during these months, trap pollutants near the ground. The winter months (November-February) present a different challenge. Cooler temperatures and reduced wind speeds lead to a build-up of particulate matter, particularly from biomass burning associated with agricultural residue management and domestic cooking. Fog, a frequent occurrence during winter, further restricts atmospheric mixing and exacerbates the problem. The post-monsoon period (October) sees a gradual improvement as rainfall decreases and wind speeds pick up. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the pre-monsoon and winter months, limiting outdoor activities during peak pollution periods. Agricultural workers are particularly vulnerable and should utilize appropriate protective measures. Maintaining indoor air quality through ventilation and air purification can also offer some protection during periods of elevated pollution.