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Nahāzāri, a small city nestled within the state of West Bengal, India, occupies a relatively flat terrain at approximately 9 meters above sea level (coordinates 22.4347, 88.2487). Its location within the Ganges Delta significantly influences its environment. The surrounding landscape is dominated by fertile alluvial plains, characteristic of the region, supporting intensive agricultural practices, primarily rice cultivation. The city’s proximity to the Hooghly River, a major distributary of the Ganges, introduces humidity and influences local wind patterns. While not directly within a major industrial belt, Nahāzāri benefits from, and is potentially impacted by, the industrial activity concentrated further south towards Kolkata. The urban-rural gradient is quite sharp; the city itself is compact with a population of 17,422, quickly transitioning to agricultural land. This proximity to agricultural zones introduces seasonal biomass burning, a key contributor to localised air pollution. The flat topography limits natural dispersion of pollutants, exacerbating air quality issues during periods of low wind speed. Dust from agricultural activities and unpaved roads also contributes to particulate matter concentrations. The city’s position within the monsoon belt means high humidity for much of the year, potentially trapping pollutants near the ground.

Nahāzāri’s air quality follows a distinct seasonal pattern. The post-monsoon months (October-November) often see a peak in pollution. The receding monsoon leaves behind stagnant air, coupled with increased agricultural burning as farmers clear fields for the next crop. Cooler temperatures during these months also contribute to temperature inversions, trapping pollutants close to the ground. Winter (December-February) brings relatively calmer conditions, but continued biomass burning and domestic fuel use maintain elevated particulate matter levels. The pre-monsoon months (March-May) are characterised by rising temperatures and dust storms, worsening air quality. The onset of the monsoon (June-September) generally provides a respite, as rainfall washes away pollutants and increased humidity suppresses dust. However, increased cloud cover can also lead to reduced sunlight, potentially increasing ground-level ozone formation. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor activity during October-February. March-May requires extra caution. Monitoring wind direction is crucial; winds from agricultural areas will likely carry higher pollutant loads. Staying indoors during peak pollution periods and using air purifiers are recommended.