NFPA 704 Fire Diamond 2
NFPA 704 Fire Diamond 2 : Health Hazard Severity (Left section of the diamond): "4" Very short exposure could cause death or serious residual injury even though prompt medical attention was given. "3" Short exposure could cause serious temporary or residual injury even though prompt medical attention was given. "2" Intense or continued exposure could cause temporary incapacitation or possible residual injury unless prompt medical attention is given. "1" Exposure could cause irritation but only minor residual injury even if no treatment is given. "0" Exposure under fire conditions would offer no hazard beyond that of ordinary combustible materials
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