The aim of the project, Studies on the Oxidation of Substituted AROMATIC Compounds under Simulated Atmospheric Conditions - SOS-AROMATIC, is to advance the knowledge on particular aspects of aromatic hydrocarbon chemistry relevant to atmosphere. This project intends to expand the database on aromatic oxidation mechanisms investigating the still unexplored OH/NO3-radical initiated gas-phase degradation mechanisms of hydroxyaromatics (e.g.cresols (o-cresol, m-cresol and p-cresol, 3- and 4-methylcatechol) and on the particle composition of the SOA formed in the reactions.