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Rāiganj, situated in the northern part of West Bengal, India, occupies a relatively flat alluvial plain formed by the Ganges and its tributaries. Its coordinates (25.6200°N, 88.1200°E) place it within the Indo-Gangetic Plain, a vast and fertile region. The city’s elevation is low, averaging around 35 meters above sea level, contributing to limited atmospheric dispersion of pollutants. The Kulik River flows nearby, influencing local humidity and potentially trapping pollutants during temperature inversions. Rāiganj serves as a crucial transport and commercial hub for the surrounding agricultural region, primarily rice and jute cultivation. The urban-rural gradient is pronounced, with agricultural lands immediately bordering the city limits. This proximity introduces seasonal biomass burning from crop residue disposal, a significant contributor to air pollution. While not a major industrial centre itself, Rāiganj benefits from, and is impacted by, industrial activity in nearby areas like the tea estates of North Bengal and the growing manufacturing sectors further south. The flat terrain and limited natural ventilation, combined with agricultural practices and regional industrial influence, create a challenging environment for maintaining optimal air quality in Rāiganj. The city’s position within the Indo-Gangetic Plain also means it’s susceptible to long-range transport of pollutants from other heavily populated areas.

Rāiganj experiences a distinct seasonal air quality pattern. The post-monsoon period, from October to November, often sees a peak in pollution. The receding monsoon leaves behind stagnant air, coupled with increased biomass burning from harvested crop fields, creating a haze. Cooler temperatures during these months also encourage temperature inversions, trapping pollutants near the ground. December and January bring relatively cleaner air due to increased wind speeds and occasional rainfall, though fog can exacerbate particulate matter concentrations. The pre-monsoon months of March to May are particularly challenging. Rising temperatures and dry conditions lead to dust storms and increased evaporation, raising particulate matter levels. Industrial activity also tends to increase during this period. The monsoon season, from June to September, generally offers the best air quality. Heavy rainfall effectively washes away pollutants, and increased humidity suppresses dust. However, increased traffic congestion due to waterlogged roads can locally elevate emissions. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor activity during October-November and March-May. Monitoring local weather patterns and avoiding peak traffic hours are advisable throughout the year. Staying indoors during periods of high pollution and using air purifiers can provide additional protection.