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 (NO x ) (with nitrogen dioxide (NO 2 ) and nitrogen monoxide (NO)), sulfur dioxide (SO 2 ), ground-level ozone (O 3 ), Benzene-Toluene-Xylenes (BTX), and particulate matters (PM) with diameters less than 10 µm (PM 10 ) and 2.5 µm (PM 2.5 ). The concentration levels of gaseous pollutants (CO, O 3 , NO 2 and SO 2 ) in the city generally remain below the limit value set by the WHO (World Health Organization). However, particulate matters (PM 10 and PM 2.5 ) 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 PM 10 and PM 2.5 vary respectively from 120 to 180 µg•m −3 and from 25 to 48 µg•m −3 . The average concentrations of pollutants therefore vary from one area to another and depending on the location of the air quality monitoring station (near industrial sites, traffic, etc.).
La pollution atmosphérique est une menace pour la santé humaine et l'environnement avec des conséquences économiques et sociales considérables. Elle fait l'objet de nombreuses études à travers le monde, et en particulier dans les pays développés où des politiques de réduction des émissions de polluants sont progressivement mises en place. Les pays en développement, à l'instar du Sénégal, sont en retard et peinent à s'organiser pour préserver la qualité de l'air. L'absence de données relatives au suivi de la qualité de l'air et la faible prise en compte des émissions de polluants dans les secteurs des transports et de l'industrie ont amené le gouvernement du Sénégal à mettre en place en 2009 le centre de gestion de la qualité de l'air (CGQA). Les particules en suspension (PM10 et PM2.5) sont les polluants les plus importants observés à Dakar et leurs concentrations dépassent les seuils annuels fixés par l'Organisation mondiale de la santé (OMS) (PM10 : 20 μg m-3 et PM2.5 : 10 μg m-3) avec un facteur de 6 à 9 pour les PM10 et un facteur de 2 à 5 pour les PM2.5. Comme conséquence, l'indice de la qualité de l'air (IQA) varie de mauvais (100 ≤ IQA < 200) à très mauvais (IQA ≥ 200) durant la saison sèche (novembre à mai) qui occupe la majeure partie de l'année. Les indices favorables, bon (IQA < 50) à moyen (50 ≤ IQA < 100), sont obtenus durant la période de juin à octobre. En particulier l'IQA est en général bon durant la saison des pluies (août et septembre). Air pollution is a threat to human health and the environment with significant economic and social consequences. It is the subject of numerous studies throughout the world, and particularly in developed countries where policies to reduce pollutant emissions are being progressively implemented. Developing countries, like Senegal, are lagging behind and struggling to organize to preserve air quality. The lack of data on air quality monitoring and the low coverage of pollutant emissions in the transport sector and industry led the Government of Senegal to establish the Air Quality Management Center (CGQA0 : Centre de Gestion de la Qualité de l'Air) in 2009. PM10 and PM2.5 are the most important pollutants observed in Dakar and their concentrations exceed the annual thresholds set by the World Health Organization (WHO) (PM10 : 20 μg m-3 and PM2.50 : 10 μg m-3) with a factor of 6 to 9 for PM10 and a factor of 2 to 5 for PM2.5. As a result, the air quality index (AQI) varies from the bad (100 ≤AQI < 200) to the very bad (AQI≥200) during the main dry season (November to May) part of the year. The favourable, good (AQI < 50) to moderate (50 ≤ AQI < 100) indices are obtained during the period from June to October. In particular, the AQI is globally good during the rainy season (August to September).
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.