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Dinajpur, nestled in the northwestern reaches of Bangladesh within the Rangpur Division, serves as a vital urban node in a region defined by its expansive, low-lying alluvial plains. Situated at an elevation of approximately 37 meters above sea level, the city is characterized by a landscape dominated by the fertile basin of the Atrai and Punarbhaba rivers. This topography, while agriculturally bountiful, creates a unique environmental profile. The urban character is a blend of historic colonial remnants and rapid, unplanned expansion that characterizes much of the Barind Tract’s periphery. Geographically, Dinajpur acts as a transition zone between the intensely cultivated northern wetlands and the slightly elevated, older alluvial terraces. This location is pivotal for air quality; the city is surrounded by vast tracts of seasonal paddy fields, which are increasingly subjected to post-harvest biomass burning. The absence of significant physical barriers or mountainous ranges allows for the unimpeded movement of air masses, yet the surrounding flat terrain often traps particulate matter under stable atmospheric conditions. As the city experiences densification, the urban-rural gradient becomes increasingly blurred, with small-scale industrial clusters and brick kilns—common to the Rangpur region—dispersed throughout the peri-urban fringe. These anthropogenic activities, combined with the region’s high humidity and heavy reliance on traditional transport, exacerbate the accumulation of localized pollutants. The interplay between the prevailing moisture-laden winds from the Bay of Bengal and the stagnant air trapped over the flat, featureless plains creates a complex atmospheric mosaic that dictates the city's overall air quality and environmental health trajectory.

Dinajpur experiences a distinct tropical monsoon climate that dictates the rhythm of its air quality throughout the year. The dry winter season, stretching from November through February, represents the most challenging period for air purity. During these months, the prevalence of temperature inversions—where cooler, dense air traps pollutants near the ground—coincides with a lack of rainfall and low wind speeds. This creates a stagnant atmospheric environment where emissions from brick kilns, vehicular exhaust, and widespread agricultural crop residue burning accumulate, leading to persistent hazy conditions. Residents sensitive to particulate matter should exercise extreme caution during these months, particularly in the early mornings when fog further traps pollutants at breathing level. As spring arrives in March, rising temperatures help dissipate these inversions, though dusty winds can occasionally elevate coarse particulate levels. The onset of the pre-monsoon period in April and May brings sporadic thunderstorms, which act as a natural scrub, momentarily improving air quality. The primary monsoon season, spanning June to September, offers the cleanest air of the year. Heavy, consistent rainfall effectively washes pollutants from the atmosphere, providing a reprieve for sensitive groups. However, the high humidity can exacerbate respiratory discomfort for some. By October, as the rains recede, the cycle begins to reset. For outdoor enthusiasts, the post-monsoon months of September and October are often the most favorable, offering clear skies and temperate conditions. Sensitive groups are advised to prioritize indoor activities during the peak winter months and utilize high-quality masks when commuting during the early morning hours.