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Churi, Jharkhand, nestled within the Chota Nagpur Plateau, occupies a geographically significant position in eastern India. Located at approximately 23.65°N, 85.01°E, the town’s elevation of around 330 meters above sea level contributes to a generally stable atmospheric layer, which can, unfortunately, trap pollutants under certain conditions. The surrounding landscape is characterized by undulating hills and dense forests, typical of the plateau region, with pockets of agricultural land interspersed amongst the greenery. This agricultural activity, while vital to the local economy, can contribute to seasonal particulate matter through burning practices. Churi sits on the periphery of the broader industrial belt of Jharkhand, benefiting from proximity to resource extraction and processing, but also facing potential downwind impacts from larger industrial centers further west. The urban–rural gradient around Churi is relatively sharp; the town itself is compact, transitioning quickly to agricultural fields and forested areas. The Barakar River flows nearby, offering some localized humidity, but its influence on regional air quality is limited. Topographically, the plateau’s bowl-like shape can exacerbate the effects of temperature inversions, particularly during cooler months, hindering vertical mixing and concentrating pollutants near the ground. The prevailing wind patterns, generally from the east during the monsoon and shifting to the west during the dry season, dictate the dispersal of emissions, impacting air quality both locally and in surrounding areas. The geological composition of the plateau, with its laterite soils, also influences dust generation, a contributing factor to particulate pollution.

Churi’s air quality follows a distinct seasonal pattern dictated by the interplay of monsoon cycles, temperature fluctuations, and agricultural practices. The monsoon season (roughly June to September) typically brings relief, with increased rainfall washing away particulate matter and strong winds dispersing pollutants. However, the onset of the monsoon can be preceded by periods of stagnant air and elevated humidity, creating conditions conducive to the build-up of pollutants. The post-monsoon transition (October-November) often sees a deterioration in air quality as agricultural burning intensifies, releasing significant amounts of smoke and particulate matter. This period is generally the most challenging for air quality. Winter (December-February) is characterized by cooler temperatures and frequent fog, which traps pollutants near the ground, leading to periods of poor visibility and elevated concentrations of fine particulate matter. Temperature inversions are common during this time, further exacerbating the problem. Spring (March-May) brings a gradual improvement as temperatures rise, promoting better atmospheric mixing and dispersing pollutants. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the post-monsoon and winter months, limiting outdoor activity during peak pollution episodes. During the dry season, wearing masks and avoiding strenuous outdoor exertion are advisable. The monsoon offers the most favorable period for outdoor activities, though vigilance is still warranted during transitional periods. Local agricultural practices and industrial emissions are key drivers of seasonal air quality variations, demanding targeted mitigation strategies.