States Adopting California's Clean Cars Standards

In 2007 Maryland became the 12th state to adopt Clean Cars legislation, implementing California’s stricter vehicles emission standards. A number of states other are currently considering adopting the standards.

The following 13 states and Washington D.C. (and their supporting legislation) have adopted California’s vehicle emission standards including the greenhouse gas standards for motor vehicles:

State	Authority	Year Adopted	Model Year Effective
California	AB 1493	2002	2005
New Jersey	P.L. 2003, Chapter 266	2004	2009
Connecticut	Public Act 04-84	2004	2008
Washington	House Bill 1397	2005	2009
Vermont	Amendments to Subchapter XI	2005	2009
New York	Chapter III, Subpart 218-8	2005	2009
Maine	Amendments to Chapter 127	2005	2009
Rhode Island	Air Pollution Control Regulation No. 37	2005	2009
Massachusetts	Amendments to the state’s LEV regulations	2005	2009
Oregon	Regulations (Division 257; OAR 340-256-0220)	2006	2009
Pennsylvania	Amendments to Title 25, Chapters 121 and 126	2006	2008
Maryland	Senate Bill 103	2007	2011
Washington D.C	Act 17-323	2008	2012
Delaware	Regulation 1140	2010	2014
Colorado	Colorado CAL LEV EO B2018-006 .pdf	2018	2022