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Kārsiyāng, nestled in the Darjeeling Plains of West Bengal, India, occupies a unique geographic position at coordinates 26.8778°N, 88.2772°E. The city’s terrain is largely flat, characteristic of the alluvial plains formed by the Teesta River and its tributaries, though gentle undulations are present. Situated approximately 60 meters above sea level, Kārsiyāng benefits from a relatively mild climate, but its location within the Indo-Gangetic Plain predisposes it to air quality challenges. The surrounding landscape is a mosaic of intensely cultivated agricultural land – primarily tea gardens, rice paddies, and areca nut plantations – interspersed with patches of deciduous forest. To the north, the foothills of the Himalayas rise sharply, influencing local wind patterns. Kārsiyāng’s proximity to Siliguri, a major transport hub and industrial area, contributes to regional pollution transport. The urban-rural gradient is pronounced; the city itself is a relatively small urban centre, but is quickly surrounded by rural agricultural activity. This proximity means agricultural burning, a common practice after harvest, directly impacts local air quality. The Teesta River, while providing a water source, doesn’t offer significant dispersion of pollutants due to its relatively narrow width and the prevailing wind directions. The city’s growth, coupled with increasing vehicular traffic, exacerbates these existing conditions.

Kārsiyāng’s air quality follows a distinct seasonal pattern. The post-monsoon period, from October to November, often sees a deterioration in air quality. The receding monsoon winds are weaker, allowing pollutants from regional sources, including agricultural burning in surrounding areas, to accumulate. Temperature inversions become more frequent during cooler mornings, trapping pollutants near the ground. Winter, from December to February, brings consistently poor air quality. Low temperatures and stagnant air masses exacerbate pollution levels, with wood and biomass burning for heating contributing significantly. March and April witness a gradual improvement as temperatures rise and winds pick up, but dust storms originating from the western plains can temporarily degrade air quality. The pre-monsoon months of May and June are generally the worst, with high temperatures and dry conditions promoting the formation of ground-level ozone. The monsoon season, from July to September, offers the most significant relief. Heavy rainfall effectively washes away pollutants, and increased wind speeds aid dispersion. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor activity during October-February and May-June. Monitoring local conditions and heeding health advisories is crucial.