Harmonization With the United Nations Recommendations, International Maritime Dangerous Goods Code and International Civil Aviation Organization’s Technical Instructions:
Final Rule; Last Revised 07/31/03; Effective Date 10/01/03
Final Rule; Last Revised 12/20/04; Effective Date 01/01/05
Notice of Proposed Rulemaking; Last Revised 08/24/10; Effective Date 08/24/10

Hazardous Materials: Misc. Changes to the Hazard Communication Requirements:
Final Rule; Last Revised 11/04/04; Effective Date 10/01/05

Applicability of the Hazardous Materials Regulations to Loading, Unloading and Storage:
Final Rule; Delay of Effective Date: Last Revised 12/08/04; Effective Date 06/01/05

Hazardous Materials: Incorporation of Exemptions Into Regulations:
Final Rule; Last Revised 01/24/05; Effective Date 03/25/05

Hazardous Materials: Incorporation of Statutorily Mandated Revisions to the Hazardous Materials Regulations:
Final Rule; Last Revised 12/09/05; Effective Date 01/09/06

Hazardous Materials: Requirements for Lighters and Lighter Refills:
Final Rule; Last Revised 01/23/06; Effective Date 01/01/07
Final Rule; Response to Appeals; Correction; Last Revised 04/25/06; Effective Date 01/01/07

Hazardous Materials: Revisions to Civil and Criminal Penalties; Penalty Guidelines:
Final Rule; Last Revised 02/17/06; Effective Date 02/17/06

Hazardous Materials Regulations: Minor Editorial Corrections and Clarifications:
Final Rule; Last Revised 09/14/06; Effective Date 10/01/06
Final Rule; Correction; Last Revised 09/20/06; Effective Date 10/01/06
Final Rule; Last Revised 10/01/07; Effective Date 10/01/07
Final Rule; Last Revised 10/01/08; Effective Date 10/01/08
Final Rule: Last Revised 10/16/09; Effective Date 10/16/09
Final Rule; Last Revised 09/01/10; Effective Date 10/01/10
Final Rule; Last Revised 10/05/12; Effective Date 10/05/12

Hazardous Material; Miscellaneous Packaging Amendments:
Notice of Proposed Rulemaking; Last Revised 09/01/06; Effective Date 09/01/06
Notice of Proposed Rulemaking; Correction; Last Revised 12/01/06; Effective Date 12/01/06
Final Rule; Last Revised 09/30/10; Effective Date 10/01/10

Hazardous Materials; Miscellaneous Amendments:
Notice of Proposed Rulemaking; Last Revised 09/25/06; Effective Date 09/25/06
Final Rule; Last Revised 01/28/08; Effective Date 10/01/08
Notice of Proposed Rulemaking; Last Revised 09/29/10; Effective Date 09/29/10
Final Rule; Last Revised 03/11/13; Effective Date 05/10/13

Hazardous Materials: Revision and Reformatting of Requirements for the Authorization to Use International Transport Standards and Regulations; Corrections:
Final Rule; Correction; Last Revised 09/28/07; Effective Date 09/28/07

Hazardous Materials: Improving the Safety of Railroad Tank Car Transportation of Hazardous Materials:
Final Rule; Last Revised 01/13/09; Effective Date 03/16/09

Hazardous Materials; Reverse Logistics (RRR):
Advance NPRM; Last Revised 07/05/12; Effective Date 07/05/12

Hazardous Materials: Harmonization wtih International Standards (RRR):
Notice of Proposed Rulemaking; Last Revised 07/15/12; Effective Date 07/15/12
Final Rule; Last Revised 01/07/13; Effective Date 01/01/14

Hazardous Materials: Miscellaneous Petitions for Rulemaking (RRR):
Notice of Proposed Rulemaking; Last Revised 05/24/12; Effective Date 05/24/12
Final Rule; Last Revised 03/07/13; Effective Date 05/06/13

Hazardous Materials: Harmonization With the United Nations Recommendations on the Transport of Dangerous Goods: Model Regulations, International Maritime Dangerous Goods Code, and the International Civil Aviation Organization Technical Instructions for the Safe Transport of Dangerous Goods by Air:
Notice of Proposed Rulemaking; Last Revised 05/25/12; Effective Date 05/25/12