Manufacturer information

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Regulatory guidance and rulemaking

Ecology is temporarily pausing portions of Advanced Clean Cars II, Advanced Clean Trucks, and Heavy-Duty Low NOx Omnibus implementation in response to recent federal actions. Read more here.  

During this pause Ecology will continue our current rulemaking for amendments to Advanced Clean Trucks and Heavy-Duty Low NOx Omnibus. 

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