Evaporative Emission Controls for On-Road Motor Vehicles

This page last reviewed September 4, 2018


Background

The California Air Resources Board (ARB) administers a program for reducing evaporative and refueling emissions from on-road motor vehicles. These reductions are accomplished using specific emission standards and test procedures.

Current Regulations and Test Procedures

  • “California Evaporative Emission Standards and Test Procedures for 2001 and Subsequent Model Motor Vehicles,” adopted August 5, 1999, last amended September 2, 2015. (PDF – 887K)
  • “California Refueling Emission Standards and Test Procedures for 2001 and Subsequent Model Motor Vehicles,” adopted August 5, 1999, last amended September 8, 2015. (PDF – 200K)
  • Authority for controlling on-road motor vehicle evaporative and refueling emissions is established in Sections 1976 and 1978, title 13, California Code of Regulations. The regulations can be found by referring to “The California Low-Emission Vehicle Regulations"
  • California's fuel fill pipe and openings requirements can be found by referring to "On-Road Light-Duty Emissions Certification Requirements".

What's New...

Public Hearing

October 2018: Public hearing to consider approving for adoption the proposed amendments to California Specifications for Fill Pipes and Openings of Motor Vehicle Fuel Tanks.

Rulemaking Webpage.

Previous Workshops

May 2018: Public workshop to discuss proposed 2018 improvements to vapor recovery nozzle and vehicle fill pipe specifications:

December 2017 public workshop to discuss potential improvements to gasoline dispensing facility vapor recovery equipment and vehicle fill pipes.


Previous Rulemakings

  • Follow-up to Tier 3

    In 2015, the evaporative and refueling emission regulations were amended to adopt key elements of the federal Tier 3 regulations.  For more information, refer to the Formal Rulemaking Document.
  • Minor Revision to LEV III Evaporative Emission Regulation

    This minor amendment, adopted by ARB on December 6, 2012, is a clarification of a LEV III carry-over provision applicable to vehicles certified to the optional zero-evaporative emission standards under LEV II.  For more information, refer to the Formal Rulemaking Documents of the December 2012 rulemaking.
  • LEV III Amendments

    On March 22, 2012, the evaporative emission regulation was amended to introduce zero-evaporative emission standards for all vehicle classes, with full phase-in by model year 2022. Also, refueling test procedures were updated. For more information, refer to the Formal Rulemaking Documents of the March 2012 rulemaking.
  • Emission Warranty Amendments

    In 2010, the evaporative and refueling emission regulations were amended as part of the emission warranty information reporting and recall rulemaking, which repealed the originally approved reporting and recall requirements of 2007. For more information, refer to the Formal Rulemaking Documents of the 2010 rulemaking and of the 2007 rulemaking.
  • Plug-in Hybrid Electric Vehicle Amendments

    In 2009, the evaporative and refueling emission regulations were amended to incorporate test procedures for plug-in hybrid electric vehicles.
  • Evaporative Test Procedure Streamlining Amendments

    In 2006, ARB adopted technical amendments for streamlining the evaporative and refueling emission test procedures, without affecting the stringency of the existing emission standards.
  • LEV II Amendments

    In 1999, the evaporative emission standards were significantly reduced as part of the LEV II rulemaking.

Archive


Where Can I Get More Information?

For more information, please contact Jason Gordon at (626) 575-7068.

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