Reactivity of polycyclic aromatic compounds (PAHs, NPAHs and OPAHs) adsorbed on natural aerosol particles exposed to atmospheric oxidants

► We performed reactivity studies of PAC adsorbed on natural aerosol with OH, O3 or NO2. ► PAH degradations led to the formation of oxygenated and nitrated derivatives. ► Benzo[a]pyrene appeared as the most reactive PAH with all oxidants. ► Dependence of heterogeneous PAH reactivity with the substrate nature was highlighted. ► We showed the strong interest to work on natural aerosol particles from ambient air.