RT Report T1 Environmental Health Criteria 202 - Selected Non-Heterocyclic Polycyclic Aromatic Hydrocarbons A1 World Health Organization, K1 hydrocarbon K1 risk assessment K1 chemical K1 toxic substance PB World Health Organization SN 92 4 157202 7 YR 1998 FD 1998 LK https://wedocs.unep.org/handle/20.500.11822/29533 UL https://wedocs.unep.org/handle/20.500.11822/29533 NO Polycyclic aromatic hydrocarbons (PAH) constitute a large class of compounds, and hundreds of individual substances may be released during incomplete combustion or pyrolysis of organic matter, an important source of human exposure. Studies of various environmentally relcvant matrices, such as coaL combustion effluents, motor vehicle exhaust, used motor lubricating oil, and tobacco smoke, have shown that the PAl -I in these mixtures are mainly responsible for their carcinogenic potential. DS UN Environment Document Repository RD Sep 16, 2026