Key Point: • Eighty-three % of the PM2 .5 measurements (21.8-194.0 μg/m 3) during the haze episode exceeded the ambient air quality standard in Thailand. • The average concentration of total PAHs during the haze episode was about 26 times higher than those in the non-haze. • Indeno[123-cd] pyrene, benzo[a]pyrene and Benzo[ghi]Perylene were dominant in the particlebound phase.
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