According to the Chemical Data Guide, propylene oxide is assigned a health hazard rating of 3,2,2. What does the last digit "2" of the rating mean?

Correct Answer: Option A — the chemical poison presents some hazard if it enters the body and typically has threshold limits of 100 to 500 ppm

The CHRIS hazard rating system evaluates health, flammability, and reactivity. A health rating digit of 2 indicates a moderately toxic chemical poison that presents hazards upon systemic entry, typically featuring OSHA threshold limits between 100 and 500 ppm.