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Mymensingh, situated in north-central Bangladesh along the Brahmaputra River's eastern bank, occupies a strategic position within the country's agricultural heartland. The city lies on the vast floodplain of the Brahmaputra basin, characterized by flat to gently undulating terrain with an average elevation of just 19 meters above sea level, creating natural drainage challenges that influence local air circulation patterns. As the administrative capital of Mymensingh Division, this urban center functions as a crucial hub connecting Dhaka to northeastern regions, surrounded by extensive rice paddies, jute fields, and vegetable farms that contribute both to the regional economy and seasonal agricultural burning emissions. The city's proximity to the Old Brahmaputra River provides some moderating effects on local temperatures but also contributes to humidity levels that can trap pollutants near ground level. Mymensingh's urban character blends colonial-era architecture with modern development, featuring a distinct urban-rural gradient where densely populated central areas gradually transition to peri-urban and agricultural zones. This geographical setting—sandwiched between major agricultural regions and experiencing rapid urbanization—creates a complex air quality dynamic where local vehicular emissions, construction dust, and domestic biomass burning interact with regional agricultural practices and transboundary pollution from neighboring areas. The flat topography limits natural ventilation, while the city's position within Bangladesh's northern plains makes it susceptible to pollution accumulation during certain meteorological conditions, particularly when winds are calm or flowing from pollution-rich directions.

Mymensingh's air quality follows a distinct seasonal rhythm shaped by the South Asian monsoon system and local meteorological patterns. During winter (December-February), cool temperatures and frequent temperature inversions trap pollutants close to the ground, creating persistent haze that often peaks in January when agricultural residue burning combines with increased domestic heating using biomass fuels. Sensitive groups should limit prolonged outdoor exposure during these months, particularly in early mornings when inversion layers are strongest. Spring (March-May) brings rising temperatures and pre-monsoon dust storms that temporarily worsen particulate pollution, though increasing wind speeds provide some dispersion relief. The summer monsoon (June-September) dramatically improves air quality as heavy rainfall scrubs pollutants from the atmosphere and strong southwesterly winds disperse local emissions—this period offers the best conditions for outdoor activities. Autumn (October-November) sees a gradual deterioration as monsoon rains retreat, humidity drops, and agricultural burning resumes during the post-monsoon harvest season. Throughout the year, fog formation during cooler months can exacerbate pollution visibility and health impacts, while the Brahmaputra River's influence creates microclimatic variations within the city. Residents with respiratory conditions should monitor local air quality advisories particularly during winter inversion periods and post-monsoon agricultural burning episodes, adjusting outdoor exercise to midday when pollution dispersion is typically better.