Hazard ratings in U.S. transportation regulations are defined by which regulation?

• A. OSHA 1910.
• B. EPA 40 CFR.
• C. DOT 49 CFR.
• D. 49 CFR.

Answer: (D)

Hazard ratings for transporting hazardous materials are defined by the Hazardous Materials Regulations issued by the Department of Transportation and codified as 49 CFR. These regulations lay out the system of hazard classes and divisions, packaging groups, and the labeling, packaging, and shipping requirements that apply to movement of HazMat by air, road, rail, and sea.

OSHA 1910 governs workplace safety and is not about how materials are classified for transport. EPA 40 CFR covers environmental regulations and hazardous waste management, not the transport classification system. The transportation rules themselves are tied to 49 CFR, which is the standard reference for HazMat classifications and related requirements.