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Fada Ngourma, situated in Burkina Faso’s Est region, occupies a geographically significant position within the country’s broader landscape. Located at approximately 12.05°N, 0.3667°E, the city rests on a gently undulating plateau, part of the larger Sudanese Savannah biome. The surrounding terrain is characterized by expansive grasslands dotted with acacia trees and shea nut trees, a typical feature of this transitional zone between the Sahel and Sudan Savannah. Elevation averages around 220 meters above sea level, contributing to relatively stable atmospheric conditions, though susceptible to seasonal shifts. While Fada Ngourma lacks immediate proximity to major rivers, it lies within a watershed area, receiving rainfall that sustains agricultural activities in the region. The urban–rural gradient transitions rapidly; the city itself is a modest urban center, quickly giving way to the predominantly agricultural landscape that defines the Est region. This agricultural zone, encompassing millet, sorghum, and cotton farming, introduces localized sources of particulate matter, particularly during harvesting and land preparation. The city’s regional importance as a market town and transport hub generates some vehicular traffic, though significantly less than major Burkinabé cities like Ouagadougou. The prevailing winds, generally from the south-east, can transport dust and pollutants from surrounding agricultural areas and potentially from further afield during periods of drought and windstorms, impacting local air quality. The relatively flat topography limits dispersion of pollutants, especially during periods of low wind speed.

Fada Ngourma experiences a distinct wet and dry season pattern, profoundly influencing its air quality. The dry season, typically spanning November to May, is characterized by lower humidity and increased wind speeds, initially offering some dispersion of pollutants. However, this period also sees a surge in dust storms, originating from the Sahel region to the north, significantly degrading air quality. These events, often occurring in February and March, can dramatically reduce visibility and pose respiratory hazards. The harmattan winds, a dry and dusty trade wind, frequently impact the region during this time. The wet season, from June to October, brings increased rainfall, which naturally helps to cleanse the atmosphere by removing particulate matter. However, the onset of the rainy season can be preceded by periods of stagnant air and high humidity, potentially trapping pollutants near the ground. Agricultural activities intensify during the wet season, with burning of vegetation for land clearing contributing to localized smoke pollution. Temperature inversions, though less frequent than in colder climates, can occasionally occur during the cooler months, trapping pollutants closer to the surface. Sensitive groups, including children, the elderly, and individuals with pre-existing respiratory conditions, should exercise caution during the dry season, particularly during dust storm events. Limiting outdoor exertion and wearing masks can mitigate exposure. During the transition periods between seasons, air quality can be unpredictable, requiring vigilance and awareness of local conditions. The months of February and March are generally the most challenging for air quality due to the prevalence of dust storms.