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Bogra, situated in Bangladesh's Rajshahi Division, occupies a strategic position in the country's northwestern region, approximately 200 kilometers northwest of Dhaka. The city lies on the eastern bank of the Karatoya River, a tributary of the Brahmaputra-Jamuna system, within the broader Barind Tract—a Pleistocene-era elevated terrace characterized by relatively higher ground compared to surrounding floodplains. This terrain, with elevations ranging from 20 to 40 meters above sea level, provides some natural drainage but also contributes to localized air stagnation during dry periods. Bogra's urban character blends administrative functions with commercial and agricultural processing, serving as a hub for the surrounding rice-growing districts and brick manufacturing clusters. The city's location within Bangladesh's primary agricultural belt means it is surrounded by extensive rice paddies and seasonal crop fields, creating an urban-rural gradient where pollution sources like agricultural burning and rice mill dust intermix with urban emissions from vehicles and domestic biomass burning. Proximity to the Himalayan foothills to the north influences regional wind patterns, while the absence of major water bodies beyond the seasonal rivers reduces natural cleansing effects. This geographic setting, combined with dense settlement patterns and industrial activities along transport corridors, creates a complex air quality scenario where topography traps pollutants, especially during the cooler months when temperature inversions are common.

Bogra's air quality follows a distinct seasonal rhythm shaped by its tropical wet-and-dry climate and regional meteorological patterns. During the dry winter months from November to February, pollution peaks dramatically due to a combination of factors: reduced rainfall allows particulate matter from brick kilns, road dust, and agricultural burning to accumulate, while temperature inversions trap pollutants near the surface. Calm winds and frequent fog further inhibit dispersion, creating hazardous conditions that particularly affect children, the elderly, and those with respiratory conditions—these groups should limit outdoor activities and use protective masks during this period. The pre-monsoon season from March to May brings rising temperatures and occasional thunderstorms that temporarily clear the air, though extreme heat can exacerbate ozone formation and dust resuspension. The monsoon from June to September offers the cleanest air, as heavy rains from the southwest monsoon wash away pollutants and strong winds provide ventilation—this is the optimal time for outdoor activities. The post-monsoon period in October sees a gradual deterioration as rainfall decreases and agricultural burning resumes ahead of the winter crop cycle. Throughout the year, wind direction shifts influence pollution transport, with northerly winds during winter sometimes bringing additional haze from regional sources, while monsoon winds from the Bay of Bengal provide relief.