Nawābganj Air Quality Index (AQI)

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Nawābganj, situated in the Rājshāhi Division of Bangladesh at approximately 24.6000°N, 88.2667°E, occupies a relatively flat landscape typical of the country’s western region. The city’s elevation is low, contributing to limited natural dispersion of pollutants. It’s nestled within the fertile plains of the Ganges-Meghna Delta, a region historically shaped by alluvial deposits from major river systems. While not directly on a major riverbank, Nawābganj is closely linked to the broader network of waterways that define the region’s hydrology and agricultural productivity. Surrounding the urban core is a predominantly agricultural landscape, characterized by rice paddies and seasonal cropping. This agricultural activity, while vital to the local economy, contributes to air pollution through biomass burning during land preparation and post-harvest. The urban-rural gradient is fairly sharp, with a noticeable increase in brick kilns and small-scale industries closer to the city centre. These industries, often operating with older technologies, are significant point sources of particulate matter. The city’s position within a densely populated region of Bangladesh means it’s susceptible to regional transport of pollutants from neighbouring areas, exacerbating local emissions. Limited green spaces within the city itself further restrict natural air purification processes.

Nawābganj experiences a tropical monsoon climate, dictating a distinct wet and dry season that profoundly impacts air quality. The dry season, roughly November to March, consistently presents the poorest air quality. Lower humidity and stagnant air masses, coupled with increased reliance on biomass burning for heating and cooking, lead to a build-up of particulate matter. Temperature inversions are common during cooler months, trapping pollutants near ground level. January and February are typically the most challenging months for respiratory health. The pre-monsoon period (March-May) sees rising temperatures and dust storms, further degrading air quality. The arrival of the monsoon in June brings a temporary reprieve. Heavy rainfall effectively washes pollutants from the atmosphere, and increased humidity suppresses dust. However, increased cloud cover can also contribute to localised pollution events. The post-monsoon season (September-October) sees a gradual return to drier conditions and worsening air quality. Sensitive groups – children, the elderly, and those with pre-existing respiratory conditions – should limit outdoor activity during the dry season and pre-monsoon periods. Wearing masks and using air purifiers indoors are recommended during peak pollution times.