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Monitoring of Atmospheric Pollutant Concentrations in the City of Dakar, Senegal

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Document pages: 13 pages

Abstract: The lack of data on air quality monitoring and neglected and overlookedpollutant emissions in the transportation and industrial sectors are motivesfor the government of Senegal to set up, in 2009, an air quality managementcenter, the CGQA (Centrede Gestion de la Qualité de l’Air). Air quality monitoring at CGQA deals withmainly six pollutants: carbon monoxide (CO), nitrogen oxides (NOx)(with nitrogen dioxide (NO2) and nitrogen monoxide (NO)), sulfur dioxide (SO2),ground-level ozone (O3), Benzene-Toluene-Xylenes (BTX), andparticulate matters (PM) with diameters less than 10 μm (PM10) and2.5 μm (PM2.5). The concentration levels of gaseous pollutants (CO,O3, NO2 and SO2) in the city generally remainbelow the limit value set by the WHO (World Health Organization). However,particulate matters (PM10 and PM2.5) are the mostimportant pollutants observed in Dakar, they far exceed the annual thresholdsset by the WHO and the national standard (NS 05-062). This situation results inan Air Quality Index (AQI) around bad and very bad during the dry season (Novemberto May) and good to moderate during the rainy season (June to October). Theconcentrations of PM10 and PM2.5 vary respectively from120 to 180 μg·m-3 and from 25 to 48 μg·m-3. The average concentrations of pollutants therefore vary from one areato another and depending on the location of the air quality monitoring station(near industrial sites, traffic, etc.).

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