ô η̶ 迬 Ե κ طο ȭй ȴٴ ̴. ̸ô 迬⸦ η̶ θµ, ַ ſ £. ̱ ȯû(United States Environmental Protection Agency, EPA) 躸DZⱸ Ͽ(International Agency for Research on Cancer, IARC) η ð Ǵ ַ ؼ (Benzene), 2-ƿƹ(2-naphthylamine) Ƿ(Benzo(a)pyrene) ߾Ϲ 1330, 30 2.53.5 ̰ ִ.Ӹ ƴ϶ η ַ Ǻο ٸ , η Ǻξ 2~6 ״. ַ η ϰ Ǿ طӴ.
ȯ ֿ 1986 ̱ Ǻ(United States Department of Health and Human Services, HHS) ɰ νϰ ȸ ɿ ĺ , ü ǰ ġ طο ۵Ǿ. , ܼ 谨 Ѿ 庴 ɰ ǰ ʷ ִٴ . Ư ȯ ȯ ֿ ۿѴ. 1994 ̱ ȸ(American College of Cardiology) ǥ ں ȯ ڰ ٰ Ѵ. 2002 ɶ Ű б(University of Helsinki) ϸ ȯ 25~25% Ų. (WIPM Wolfson Institute of Preventive Medicine) ڰ ڿ Ȱϴ ̳ ɱٰ ɸ 30% . ̴ Ϸ翡 ǿ ڰ ̳ ɱٰ ɸ شϴ ġ.