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Exposure to polycyclic aromatic hydrocarbons usually occurs by breathing air contaminated by wild fires or coal tar, or by eating foods that have been grilled. PAHs have been found in at least 600 of the 1,430 National Priorities List sites identified by the Environmental Protection Agency (EPA). ... Some PAHs are manufactured.
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www.atsdr.cdc.gov/tfacts69.html
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Toxicological Profile for; Polycyclic Aromatic Hydrocarbons (PAHs); August 1995 ... Agency for Toxic Substances and Disease Registry (ATSDR). 1995. Toxicological profile for Polycyclic Aromatic Hydrocarbons (PAHs). Atlanta, GA: U.S. Department of Health and Human Services, Public Health Service.
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www.atsdr.cdc.gov/toxprofiles/tp69.html
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Why are benzene and other aromatic compounds so stable? ... The high stability of benzene and other aromatic compounds is due to the delocalisation of the double bonds (more exactly due to the delocalisation of pi-electrons associated with the double bonds).
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coct.qld.edu.au/Subjects/chemistry/yr12/arom.htm
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www.fsj.ualberta.ca/chimie/chem161/bAROM_A/sld001.htm
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Any compound with the benzene ring is an aromatic compound. The term "aromatic" came to be because earlier compounds found with the rings ... The aromatic hydrocarbons include benzene and the alkyl derivatives of benzene, a six sided ring drawn with alternating single and double bonds or with a circle in the middle.
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library.thinkquest.org/3659/orgchem/aromatic.html
library.thinkquest.org/3659/orgchem/aromatic.html
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Aromatic hydrocarbons have ring structures. Ring systems with double bonds that cannot be localized are called mesomere systems. Aromatic hydrocarbons carrying hydroxyl-groups are called phenols. There exist also ring compound with ring elements other than carbon.
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www.biologie.uni-hamburg.de/b-online/e16/16i.htm
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What are Polycyclic Aromatic Hydrocarbons? ... Polycyclic Aromatic Hydrocarbons (PAHs) are a group of chemicals that occur naturally in coal, crude oil and gasoline. PAHs also are present in products made from fossil fuels, such as coal-tar pitch, creosote and asphalt.
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www.idph.state.il.us/envhealth/factsheets/polycyclicaro...
www.idph.state.il.us/envhealth/factsheets/polycyclicaromatichydrocarbons.htm
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Benzenoid aromatic hydrocarbons are also called arenes. Benzene itself is the prototypical arene. The properties associated with aromaticity have little to do with aroma, although the aromatic hydrocarbons were first studied in connection with naturally occurring fragrances.
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www.answers.com/topic/aromatic-hydrocarbon
www.answers.com/topic/aromatic-hydrocarbon
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