Manufacturer information

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ACT enforcement update

In response to manufacturer restrictions, we’ve temporarily updated our enforcement policy for certain vehicles covered by Advanced Clean Trucks and Heavy-Duty Low-NOx Omnibus to ensure state and local agencies can address public safety. For more information, see our statement.

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Clean Vehicles Program rulemaking

Ecology is considering amendments to the Clean Vehicles Program rule. Visit our rulemaking page for more information, including upcoming virtual information sessions and recordings.

Ecology is legally required to implement California’s low- and zero-emission vehicle standards. These manufacturer regulations don’t impose purchasing requirements on individuals or businesses; they don't apply to used or off-road vehicles; and they don't prohibit anyone from continuing to operate a gas- or diesel-powered vehicle in Washington.


Complying with vehicle emissions standards

While zero-emission standards require manufacturers to sell more new electric and plug-in hybrid vehicles in Washington, low-emission standards require that all new internal combustion engine vehicles sold in our state produce less pollution.

Compliance FAQs


Other FAQs