National Fire Protection Association (NFPA) Health Risk Rating:
- Level 4
Materials that can affect health or cause serious injury, during periods of very short exposure, even though prompt medical treatment is given.
- Level 3
Materials that can affect health or cause serious injury, during periods of short exposure, even though prompt medical treatment is given.
- Level 2
Materials that can cause incapacitation or residual injury, during intense or continued exposure, unless prompt medical treatment is provided.
- Level 1
Materials that cause irritation upon exposure, but only minor injury is sustained even if no medical treatment is provided
- Level 0
Materials that offer no unusual hazards upon exposure to fire conditions. Hydrogen Sulfide has a NFPA Health Risk Rating of 4! [21]
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