Joint OSHA-PHMSA Memo (PDF)
The U.S. Department of Transportation’s (DOT) Pipeline and Hazardous Materials Safety Administration (PHMSA) and the U.S. Department of Labor’s Occupational Safety and Health Administration (OSHA) are responsible for enforcing distinct and separate safety standards that address appropriate labeling of chemical hazards in transportation (PHMSA) and in the workplace 1 (OSHA).