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Meetings & Hearings

Low Emission Vehicles, Chapter 173-423 WAC

Public hearing — online

July 27, 2021, 1:30 p.m., online webinar

Ecology is holding a public hearing about the rulemaking for Low Emission Vehicles, Chapter 173-423 WAC.

Washington is expanding its program by adopting California’s more protective vehicle emission standards for new vehicles — starting with model year 2025 and later — sold in Washington. Motor vehicles are the largest source of air pollution in Washington. Transportation contributes about 22 percent of total air pollution and 45 percent of greenhouse gas emissions throughout the state.

Online public hearing (webinar)

  • Register for the webinar to get your access code and password.
  • To hear the webinar better, use your phone (instead of the computer) to call 1-855-929-3239.


  • Presentation
  • Question-and-answer session
  • Public hearing


We write rules to implement and enforce state and federal environmental laws and rules.  Ecology follows a three-phase process for rulemaking:

  1. Announcement and development
  2. Proposal
  3. Adoption

For each phase of the process, we update the rulemaking web page and notify interested parties. We also file notice in the Washington State Register. To learn more about Ecology’s rulemaking process, read the Frequently Asked Questions.

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July 27, 2021, 1:30 p.m.
Join online
Join by phone:
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Elena Guilfoil
Rulemaking Lead
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Comment period

Low Emission Vehicles, Chapter 173-423 WAC — Proposed rulemaking
Closes: Aug. 2, 2021, 11:59 p.m.
See details

To request ADA accommodation, contact Ecology's ADA Coordinator by email at ecyadacoordinator@ecy.wa.gov, or call 360-407-6831, 711 (relay service), or 877-833-6341 (TTY). More about our accessibility services.