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Polycyclic aromatic hydrocarbons (PAHs) are ubiquitous environmental pollutants that are generated from incomplete combustion of organic matters such as fuel oil and coal.In the atmosphere, PAHs react with the co-pollutants, such as ozone and nitrogen oxides (NOx) to produce substituted PAHs.One type of substituted PAHs is hydroxylated PAHs (OH-PAHs).They may be generated from photochemical reactions of PAHs or combustion of coal.OH-PAHs have endocrine disrupting activities such as estrogenic activities or antiestrogenic activities.Atmospheric concentrations of OH-PAHs were reported to be in the pg/m3 range, which are 1-3 orders of magnitude lower than that of PAHs.Therefore, it is necessary to establish a highly sensitive and reliable method for determination of OH-PAHs in atmosphere.