Sylvain Gnamien This email address is being protected from spambots. You need JavaScript enabled to view it.1,2, Véronique Yoboué1, Cathy Liousse2, Money Ossohou1, Sékou Keita3, Julien Bahino1, Silué Siélé3, Lamine Diaby1

Laboratoire de Physique de l’Atmosphère et de Mécanique des Fluides, Université Félix Houphouët-Boigny, Abidjan BPV 34, Côte d’Ivoire
Laboratoire d’Aérologie, CNRS, Toulouse, France
Université Péléforo Gon Coulibaly, Korhogo, Côte d’Ivoire


Received: May 6, 2020
Revised: August 27, 2020
Accepted: October 14, 2020

 Copyright The Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.

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Gnamien, S., Yoboué, V., Liousse, C., Ossohou, M., Keita, S., Bahino, J., Siélé, S. and Diaby, L. (2020). Particulate Pollution in Korhogo and Abidjan (Cote d’Ivoire) during the Dry Season. Aerosol Air Qual. Res.


  • PM2.5 concentrations are two to four times higher than WHO guidelines at both cities.
  • PM10 and PM2.5 concentrations in Korhogo are higher than in Abidjan.
  • Low-income populations are exposed to higher concentrations of PM.
  • PM2.5 contribution is less than 40% to PM10 in Korhogo and more than 50% in Abidjan.
  • Daily PM variations are more marked in Korhogo than in Abidjan.


Particulate pollution in West African cities seriously impacts public human health. Assessing the levels of pollution to which populations are exposed is problematic, as to date very few countries in Africa have an air quality monitoring network in place. However, given the specific anthropogenic sources present in West African countries and the increase in their projected emissions in the coming years if no regulations are put in place, solutions must be found. This study evaluates with a simple existing methodology particulate air pollution in two West African cities (Korhogo and Abidjan in Cote d'Ivoire) which have different population practices and local meteorology.

From two measurement campaigns at about ten sites during the dry season and using the inverse distance-weighted interpolation method, maps of spatial variation in PM10 and PM2.5 concentrations are obtained at the scale of each of these cities, which provide a snapshot of the concentration levels to which populations are actually exposed. The results of this study showed that populations in low- and middle-income areas are exposed to higher concentrations than those in high-income areas. The analysis of the relative contribution of fine particles to coarse particles shows that PM2.5 contributes to PM10 at less than 40% in Korhogo but more than 50% in Abidjan. Daily average concentrations of PM2.5 are all above WHO standards, and are 2 to 8 times higher in Korhogo, while in Abidjan they are up to 4 times higher. The daily profiles of the mean hourly concentrations of the sites are similar across all sites in Korhogo, while in Abidjan, that of some sites show some differences.

This study, by the methodology used, offers an opportunity for different research teams to assess at lower cost the population's exposure levels to urban particulate pollution.

Keywords: Urban air quality; Aerosols; Africa cities; PASMU project.

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