HM/DG

HM/DG (plural HM/DGs)

2. Initialism of hazardous materials/dangerous goods.

   Synonym: hazmat

   • 2025 September 10, Noël Fletcher, “CVSA Hazmat Safety Blitz Snags Nearly 1,200 Violations. Improper Placarding Top Violation Among U.S. Trucks”, in Transport Topics‎^[1]:

     A five-day blitz of surprise inspections for 4,629 commercial vehicles transporting hazardous materials and dangerous goods revealed improper placarding as the top cause for violations issued, the Commercial Vehicle Safety Alliance [CVSA] announced. Inspectors during a roadside initiative that ran June 9-13 across the United States and Canada discovered 1,169 HM/DG violations, of which 598, or 51%, were out-of-service violations. Forty-five jurisdictions — 35 states and all 10 Canadian provinces — participated in the inspection campaign, but the vast majority of vehicles inspected were in the U.S. In total, CVSA inspectors examined nearly 7,300 HM/DG packages across nine hazardous categories. […] “The transportation of HM/DG demands rigorous training and heightened compliance requirements. For motor carriers and drivers, safely transporting HM/DG is imperative to the safety of the driver, the public and the environment,” CVSA said. […] Inspections that uncovered any out-of-service [OOS] violations — including any not related to HM/DG cargo — resulted in trucks being restricted from further travel until those violations were addressed. Inspectors issued 20 OOS orders for HM/DG package integrity (leaking) violations. There are nine HM/DG categories that group a material’s specific chemical and physical properties, which also have different risks. For instance, Class 1 materials include ammunition, fireworks and flares. Class 2 is for gases, flammable/nonflammable oxygen and inhalation hazards. Class 4 contains flammable solids, while Class 7 encompasses radioactive materials.