National-Scale Air Toxics Assessment Overview: The 33 Pollutants

Note: EPA no longer updates this information, but it may be useful as a reference or resource.

AIR POLLUTANTS INCLUDED IN THE ASSESSMENT
1. acetaldehyde	18. formaldehyde
2. acrolein	19. hexachlorobenzene
3. acrylonitrile	20. hydrazine
4. arsenic compounds	21. lead compounds
5. benzene	22. manganese compounds
6. beryllium compounds	23. mercury compounds
7. 1, 3-butadiene	24. methylene chloride
8. cadmium compounds	25. nickel compounds
9. carbon tetrachloride	26. perchloroethylene
10. chloroform	27. polychlorinated biphenyls (PCBs)
11. chromium compounds	28. polycyclic organic matter (POM)*
12. coke oven emissions	29. propylene dichloride
13. 1, 3-dichloropropene	30. quinoline
14. diesel particulate matter	31. 1, 1, 2, 2-tetrachloroethane
15. ethylene dibromide	32. trichloroethylene
16. ethylene dichloride	33. vinyl chloride
17. ethylene oxide
* also represented as 7-PAH