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Brahmanbaria is situated in eastern Bangladesh's Chattogram Division, positioned at coordinates 23.9723°N, 91.1099°E along the Titas River floodplain. This urban center lies approximately 100 kilometers northeast of Dhaka and 70 kilometers west of the Indian border at Tripura, placing it within the agriculturally intensive Brahmaputra-Meghna river basin. The city's topography is predominantly flat alluvial plains with an average elevation of just 15 meters above sea level, creating minimal natural ventilation corridors. Brahmanbaria's urban character blends traditional bazaar districts with expanding residential zones, surrounded by extensive rice paddies and jute cultivation that create distinct urban-rural gradients. Proximity to the Titas River provides some atmospheric moisture but also contributes to seasonal fog formation. The city's location within Bangladesh's eastern industrial corridor—stretching from Dhaka to Chattogram—means it experiences transboundary pollution from both domestic agricultural burning and regional industrial emissions. Being landlocked within the Ganges Delta system, Brahmanbaria lacks coastal breezes that might disperse pollutants, while its position downwind from India's northeastern states occasionally brings cross-border agricultural smoke during pre-monsoon burning seasons. The combination of dense urban development, surrounding agricultural combustion, and industrial emissions from nearby Comilla and Dhaka creates complex air quality challenges amplified by the region's atmospheric stagnation.

Brahmanbaria experiences distinct seasonal air quality patterns shaped by the South Asian monsoon cycle. During winter (December-February), cool temperatures and frequent temperature inversions trap pollutants near the surface, with December and January typically showing the poorest air quality. Morning fog combines with smoke from agricultural residue burning and domestic heating sources, creating persistent haze that particularly affects respiratory patients and children. Spring (March-May) brings rising temperatures and increased agricultural burning before the monsoon, with March-April often experiencing peak pollution from crop residue combustion and dust storms. The pre-monsoon heat creates convective conditions that occasionally lift pollutants but also generates ozone through photochemical reactions. Summer (June-September) sees dramatic improvement during the monsoon season, as heavy rainfall from June through August scrubs particulate matter from the atmosphere, making July-August the cleanest months for outdoor activities. However, high humidity can exacerbate respiratory distress for some individuals. Autumn (October-November) marks the transition period with decreasing rainfall and increasing pollution buildup, as agricultural burning resumes and atmospheric mixing decreases. Sensitive groups should limit outdoor exertion during morning hours in winter and spring, while all residents benefit from monitoring local air quality alerts, particularly during crop burning seasons and winter inversion episodes.