Chemicals by Category

CDC/ATSDR scientists have grouped chemicals into categories based on similarities in how they affect health or the environment.


Chemicals causing severe blisters in the eyes, skin, and lining of the nose, sinuses, mouth, throat, and lungs (respiratory tract).
- Lewisite (L, L-1, L-2, L-3)
- Nitrogen mustard (HN-1, HN-2, HN-3)
- Phosgene oxime (CX)
- Sulfur mustard (H) (mustard gas)

Chemicals causing severe irritation or swelling the lining of the respiratory tract.

Chemicals that prevent the brain and nerves to the muscles and organs (nervous system) from working properly.
G agents
V agents