Figure 2From: Physico-chemical characterization of African urban aerosols (Bamako in Mali and Dakar in Senegal) and their toxic effects in human bronchial epithelial cells: description of a worrying situation Relative mass distribution of polyaromatic hydrocarbons (PAH) for bulk aerosol of Bamako and Dakar samples. Results are expressed in percentage of the total PAH for each sample. The total quantity of PAH in the air is indicated in ng.m-3.Back to article page