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Overlay of gas chromatography–mass spectrometry selected ion monitoring total ion chromatograms demonstrating ultraviolet B (UVB)-induced formation of oxygenated polycyclic aromatic hydrocarbons (PAHs) from UVB-irradiated PAH standard solutions after 0 min, 10 min, and 30 min. The PAH homologues of 9,10-anthraquinone (9,10-ANTQ) and 7,12-benz[a]anthraquinone (7,12-BaANCQ) were present in PAH standards prior to UVB irradiation, namely, anthracene and benz[a]anthracene.
