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1993, Frank T. Princiotta, Douglas G. McKinney, “Air Toxics: The Research Challenge of the 1990 Clean Air Act Amendments”, in Winston Chow, Katherine K. Connor, editors, Managing Hazardous Air Pollutants: State of the Art, CRC Press, published 2019, →ISBN, →LCCN, →OCLC, page 59:
The purpose of this program is to reduce 75% of the cancer incidence resulting from area sources (defined as stationary sources which emit less than 10 tons of a single HAP or 25 tons of a combination of HAPs) of hazardous air pollutants in urban areas.
2011, Nathalie Chèvre, Suren Erkman, Alerte aux micropolluants, Lausanne: Presses polytechniques et universitaires romandes, →ISBN, page 32:
Par ailleurs, le trafic routier et ferroviaire constitue une source importante d’émissions de métaux et de substances dangereuses, tels que les hydrocarbures aromatiques polycycliques (HAP) qui résultent d’une combustion imparfaite de l’essence.