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Bānchpār, situated in the Chattogram Division of southeastern Bangladesh, occupies a distinctive position within the dynamic landscape of South Asia. Located at coordinates 23.2081°N, 90.7979°E, this urban centre lies approximately 40 kilometres northwest of Chattogram city, placing it within the broader Chattogram metropolitan region—a critical industrial and commercial hub for Bangladesh. The terrain here is predominantly flat, characteristic of the Ganges-Brahmaputra Delta, with elevations rarely exceeding 10 metres above sea level, which influences local atmospheric conditions by limiting natural ventilation. Proximity to the Karnaphuli River and the Bay of Bengal, about 50 kilometres to the south, introduces maritime influences that can moderate pollution levels under certain wind patterns, though this effect is often offset by urban emissions. Bānchpār sits within an urban–rural gradient, transitioning from dense settlements to surrounding agricultural zones dominated by rice paddies and tea gardens, which contribute seasonal biomass burning. The region forms part of Bangladesh's primary industrial belt, with nearby manufacturing, shipbreaking, and port activities in Chattogram emitting pollutants that drift inland, exacerbated by the city's own general urban sources like vehicular traffic, construction, and residential fuel use. This geographic setting, combined with low elevation and high humidity, creates a basin-like effect where pollutants accumulate, particularly during calm weather, making air quality a persistent concern influenced by both local and regional factors.

In Bānchpār, air quality follows a pronounced seasonal rhythm shaped by the South Asian monsoon and local meteorological patterns. During winter (December to February), pollution typically peaks due to temperature inversions that trap pollutants near the surface, combined with low wind speeds and frequent fog, creating hazardous conditions; sensitive groups like children, the elderly, and those with respiratory issues should limit outdoor activities, especially in the early mornings. Spring (March to May) sees a gradual improvement as temperatures rise and winds increase, though pre-monsoon dust storms and agricultural burning can cause intermittent spikes, making late spring a better time for outdoor pursuits with caution on windy days. The summer monsoon (June to September) brings the cleanest air, as heavy rainfall scrubs pollutants from the atmosphere and strong southwesterly winds disperse emissions, offering the most favourable period for outdoor activities with minimal health risks. Autumn (October to November) marks a transition, with decreasing rainfall and rising pollution levels as industrial and vehicular emissions accumulate under stable atmospheric conditions; during this time, it's advisable to monitor local air quality reports and plan activities for midday when mixing is better. Overall, the monsoon months provide the healthiest environment, while winter requires heightened awareness and protective measures for vulnerable populations.