Air quality degradation is a major issue in the large conurbations on the shore of the Gulf of Guinea. Daily simultaneous samplings of PM10 and PM2.5 particulate matter (PM) were made at seven different sites during the dry period (December 2023 to March 2024) in Conakry city, Republic of Guinea. Measurements were performed in the vicinity of major combustion aerosol sources: UGANC (site traffic of Conakry University), CP (site of domestic and roads), CS (site of slaughterhouse), GCC (landfill site), AGEE (site of alumina unloading), NH (site of traffic and Landfill for garbage) and RTGB (site traffic). On seven different sites, the daily average concentration varied from 44.04 to 285.65 μg.m？3 in PM2.5, 98.4 to 652.8 μg.m？3 in PM10, respectively. Average PM2.5 and PM10 level were 182.40 ± 99.13 μg.m？3 and 435.19 ± 246.27 μg.m？3, respectively, with PM2.5 constituting 44.50 ± 10.01 %of the PM10 mass. Moreover, the average ratio of PM2.5/PM10 is equal to 79.29 % on CS site, which indicates that the PM2.5 had been one of the main contaminations affecting urban atmospheric environmental quality on CS site in Conakry city.
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