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:



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



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