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Dori serves as a pivotal urban hub within the Sahel region of northern Burkina Faso, positioned in a transitional zone between the semi-arid savannah and the vast Sahara Desert. The town is characterized by a flat, undulating terrain dominated by sandy soils and sparse, drought-resistant vegetation, which creates a porous landscape susceptible to wind erosion. Its regional position makes it a critical crossroads for trade and livestock movement, contributing to a distinct urban-rural gradient where nomadic pastoralism meets permanent settlement. The absence of significant mountains or large permanent bodies of water means there are few natural barriers to atmospheric movement, allowing air masses to sweep across the plains unimpeded. This geographic openness is a primary driver of the city's air quality challenges, as the town is directly exposed to the massive influx of mineral dust originating from the Bodélé Depression and other Saharan sources. While Dori lacks a heavy industrial belt, its urban character is defined by low-rise structures and unpaved roads that generate significant fugitive dust during vehicle transit. The agricultural zone surrounding the town relies on subsistence farming, where the seasonal clearing of land through slash-and-burn practices introduces organic aerosols into the lower atmosphere. Consequently, the interplay between its desert-edge location and the lack of vegetative buffering ensures that particulate matter remains the dominant pollutant, dictated more by regional geography than by local industrial emissions and activity.

Air quality in Dori is dictated by the stark contrast between the long dry season and the brief, intense rainy season. From November to May, the atmosphere is dominated by the Harmattan, a dry, northeasterly trade wind that carries immense quantities of fine Saharan dust. During these months, pollution peaks as the air becomes thick with mineral particulates, often reducing visibility and causing respiratory distress. Temperature inversions during the cool early mornings can trap these particles near the ground, exacerbating the impact on public health. Conversely, the wet season, spanning June to October, provides a dramatic atmospheric cleansing. Frequent monsoon rains act as a natural scrubber, washing particulate matter from the sky and suppressing dust through soil saturation. This period represents the trough of pollution, offering the cleanest air of the year. For sensitive groups, including children and those with asthma, the peak Harmattan months of December and January are the most hazardous, requiring the use of protective masks and limited outdoor exertion. Health guidance emphasizes staying hydrated and avoiding prolonged exposure during dust storms. While the rainy season is generally healthier for the lungs, the increased humidity can sometimes trigger different respiratory sensitivities. Therefore, the ideal window for outdoor activity is the transition period in late October, just as the rains cease but before the Harmattan fully takes hold, balancing moderate temperatures with relatively low particulate concentrations overall.