To elucidate the major sources of the SOAs, we carried out a positive matrix factorization analysis to identify the major sources of SOA coating, which controls the lifetime of PAHs. We detected an inhibition of the degradation PAHs by SOA coatings by collecting PAHs simultaneously at the three sites. The results of this study are consistent with laboratory studies in which secondary organic aerosol (SOA) coatings protected PAHs from degradation by ozone. Benzopyrene persisted in 5–16% of samples. We estimated the relative contributions of the PAHs at the three sites by normalizing the PAH concentrations to elemental carbon. We identified air masses that passed over all sites and combined our measurements with a chemical transport model. PAHs were analyzed via gas chromatography/mass spectrometry. These remote sites were convenient for investigating the degradation of PAHs during long-range transport. Aerosols were collected simultaneously at remote sites on Tuoji Island, China Fukue Island, Japan and the Cape Hedo Atmosphere and Aerosol Measurement Station (CHAAMS), Okinawa, Japan in April, October, and December from 2012 to 2013. We investigated the degradation of polycyclic aromatic hydrocarbons (PAHs) during long-range transport.
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