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Rajshahi, situated in northwestern Bangladesh along the Padma River's northern bank, occupies a strategic position in the agriculturally rich Rajshahi Division. The city's urban character blends administrative functions with commercial activity, serving as a regional hub for education and mango processing industries. Its terrain is predominantly flat alluvial plains typical of the Bengal Delta, with elevations averaging just 20-30 meters above sea level, creating minimal natural ventilation corridors. Rajshahi's location places it within Bangladesh's 'brick kiln belt,' where hundreds of traditional kilns operate along the urban periphery, contributing significantly to particulate pollution. The city's proximity to the Padma River provides some atmospheric moisture but also creates seasonal dust from exposed riverbeds during dry periods. An urban-rural gradient extends outward into intensive agricultural zones where rice paddies and mango orchards dominate, with seasonal burning of crop residues and mango processing dust adding to the pollution burden. The surrounding landscape lacks significant topographic barriers, allowing pollutants to accumulate under stagnant atmospheric conditions while occasionally receiving transported pollution from upwind agricultural regions. This geographic setting, combined with dense urban development and industrial activities concentrated along transportation corridors, creates a complex air quality challenge where natural cleansing mechanisms are limited by the region's flat topography and seasonal weather patterns.

Rajshahi's air quality follows a distinct seasonal pattern shaped by its tropical wet-and-dry climate and regional pollution sources. During the dry winter months from November through February, pollution peaks dramatically as cool temperatures create frequent temperature inversions that trap pollutants near the surface. These months coincide with brick kiln operations at maximum capacity, agricultural burning after harvests, and increased domestic biomass burning for heating, compounded by calm winds and persistent fog that hinder dispersion. Sensitive groups should avoid prolonged outdoor exposure during this period, particularly in mornings when inversion layers are strongest. The pre-monsoon months of March through May bring extreme heat that accelerates photochemical reactions, though occasional thunderstorms provide temporary cleansing; outdoor activities are best scheduled after rainfall events. The monsoon season from June to September offers the cleanest air as southwest winds and heavy rainfall scrub pollutants from the atmosphere, making this the optimal time for outdoor activities despite high humidity. The post-monsoon transition in October sees deteriorating conditions as rainfall decreases and pollution sources reactivate. Throughout the year, vulnerable populations should monitor local air quality advisories, use protective masks during peak pollution episodes, and plan outdoor activities for late mornings when inversion layers typically break.