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• <br />Phenanthrene <br />Phenanthrene is a colorless, shining crystal with a faint aromatic <br />odor. <br />Short-term inhalation exposure to phenanthrene, classified and <br />evaluated toxicologically as a polycyclic aromatic- hydrocarbon <br />(PAH), has not been found to cause adverse acute health effects. <br />Short-term oral exposure to phenathrene could cause <br />gastrointestinal irritation. Phenanthrene has been found to lead <br />to adverse health effects both fewer in number and lesser in <br />severity than other PAHs. PAH toxicity is generally based on the <br />most toxic chemicals of the group -- benzo(a)pyrene. <br />PAHs are classified by the U.S. Environmental Protection Agency as <br />Group B2 probable human carcinogens. <br />The PEL for phenanthrene, as represented by "Coal Tar Pitch," is <br />0.2 mg/m3. <br />47 <br />