PHMSA is amending the Hazardous Materials Regulations (HMR) to maintain alignment with international regulations and standards by adopting various amendments, including changes to proper shipping names, hazard classes, packing groups, special provisions, packaging authorizations, air transport quantity limitations, and vessel stowage requirements. Additionally, PHMSA is amending the HMR to allow for better alignment with Transport Canada's Transportation of Dangerous Goods Regulations. PHMSA is also withdrawing the unpublished 1 October 2020, Notice of Enforcement Policy Regarding International Standards on use of select updated international standards in complying with the HMR during the pendency of this rulemaking. This rule is effective 25 August 2022. POC is Candace Casey, Standards and Rulemaking, Steven Andrews, Standards and Rulemaking, or Aaron Wiener, International Program, at (202) 366-8553, Pipeline and Hazardous Materials Safety Administration, U.S. Department of Transportation, 1200 New Jersey Avenue SE, East Building, 2nd Floor, Washington, DC 20590-0001. (Federal Register 26 July 2022 [Rule] Pages 44944-45001)