Inherent Toxicity Levels of Chemicals Hazardous to Health OSHA

Appendix 2.A.3 Inherent Toxicity Levels of Chemicals Hazardous to Health (OSHA) 

LDjo (oral/digestive system) Toxic if 50-500 mg/kg Highly Toxic if 50 mg/kg. 

LDjo (dermal exposure) Toxic if 200-1000 mg/kg Highly Toxic if 200 mg/kg. 

LCjo (inhalation) Toxic if 200-2000ppm (2-20 mg/1) Highly Toxic if 200 ppm. 

There are also several special systems that have been developed for grading chemical health hazards, e.g., by the National Fire Protection Association (NEPA), considering mainly chemicals evolved under fire conditions which are rated from 0 (non-toxic) to 4 (extremely toxic). 

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