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Pujali, West Bengal, occupies a geographically significant position within the Ganges Delta, a vast alluvial plain shaped by centuries of sediment deposition from the Ganges and Hooghly rivers. Located approximately 35 kilometers south of Kolkata, Pujali’s terrain is predominantly flat, characteristic of the deltaic landscape, with elevations rarely exceeding 5 meters above sea level. This low-lying topography contributes to poor air circulation, particularly during periods of stagnant weather. The surrounding landscape is a mosaic of agricultural fields – primarily rice paddies and jute cultivation – interspersed with small villages and gradually transitioning into more densely populated areas closer to Kolkata. The Hooghly River flows nearby, influencing local humidity and temperature, but also potentially acting as a conduit for pollutants transported from upstream industrial zones. Pujali’s proximity to Kolkata’s industrial belt, including petrochemical and manufacturing facilities, is a crucial factor impacting its air quality. The urban–rural gradient is relatively sharp; Pujali itself exhibits a developing urban character with increasing residential and commercial areas, while the immediate periphery remains largely agrarian. The flat, low-lying terrain, combined with the deltaic environment and proximity to industrial activity, creates conditions that can exacerbate air pollution episodes, hindering dispersion and trapping pollutants close to the ground. The region's susceptibility to flooding also influences air quality, as stagnant water can contribute to the release of volatile organic compounds.

Pujali’s air quality follows a distinct seasonal pattern dictated by the region’s monsoon climate. The monsoon season, typically spanning June to September, brings relief from accumulated pollutants due to frequent rainfall and strong winds that effectively flush the atmosphere. However, agricultural burning after the harvest season (September-October) can introduce significant particulate matter, temporarily degrading air quality. The post-monsoon period (October-November) often sees a build-up of pollutants as wind speeds decrease and temperature inversions become more frequent, trapping emissions close to the ground. This is generally the most challenging period for air quality. Winter (December-February) is characterized by cooler temperatures and frequent fog, which severely restricts atmospheric mixing and exacerbates pollution. The stagnant air and reduced sunlight during these months allow pollutants to accumulate. Spring (March-May) sees a gradual improvement as temperatures rise, wind speeds increase, and fog dissipates, leading to better dispersion. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the post-monsoon and winter months, limiting outdoor activities during peak pollution periods. Agricultural workers are particularly vulnerable during the harvest season due to exposure to smoke from burning fields. Maintaining indoor air quality through ventilation and air purifiers can offer some protection, and wearing appropriate masks during periods of high pollution is advisable. The interplay of monsoon patterns, agricultural practices, and temperature inversions shapes Pujali’s annual air quality cycle.