The lack of data on air quality monitoring and neglected and overlooked
pollutant emissions in the transportation and industrial sectors are motives
for the government of Senegal to set up, in 2009, an air quality management
center, the CGQA(Centre
de Gestion de la Qualité de l’Air). Air quality monitoring at CGQA deals with
mainly 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), and
particulate matters (PM) with diameters less than 10 μm (PM10) and
2.5 μm (PM2.5). The concentration levels of gaseous pollutants (CO,
O3, NO2 and SO2) in the city generally remain
below the limit value set by the WHO (World Health Organization). However,
particulate matters (PM10 and PM2.5) are the most
important pollutants observed in Dakar, they far exceed the annual thresholds
set by the WHO and the national standard (NS 05-062). This situation results in
an Air Quality Index (AQI) around bad and very bad during the dry season (November
to May) and good to moderate during the rainy season (June to October). The
concentrations of PM10 and
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