Commenting open: May 15, 2025 12:00AM PT - July 03, 2025 11:59PM PT.
Chapter 173-423 WAC, Clean Vehicles Program Rulemaking Formal Comment Period
Ecology is proposing amendments to our Clean Vehicles Program Rules (Chapter 173-423 WAC) to incorporate changes to the Advanced Clean Trucks and Heavy-Duty Low NOx Omnibus regulations adopted by the California Air Resources Board (CARB). These regulations are an essential policy tool for addressing climate change and improving air quality in Washington.
These proposed amendments respond to industry concerns by easing compliance requirements for the heaviest vehicles. They also streamline implementation and maintain consistency with state and federal laws. The Advanced Clean Trucks program applies to medium- and heavy-duty engine and vehicle manufacturers. It requires manufacturers to gradually sell more new zero-emission models in Washington through model year 2035, and provides flexibility by allowing manufacturers to purchase credits from other manufacturers to meet this requirement and choose which models to transition to zero-emissions technology. The Heavy-Duty Low NOx Omnibus regulation applies to heavy-duty internal combustion engine manufacturers and requires them to meet more protective air quality standards, particularly on oxides of nitrogen and particulate matter, starting in model year 2026.
Comments are accepted from May 15, 2025 at 12:00 AM to July 3, 2025 at 11:59 PM. Visit the Chapter 173-423 WAC webpage here.
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Ecology is proposing amendments to our Clean Vehicles Program Rules (Chapter 173-423 WAC) to incorporate changes to the Advanced Clean Trucks and Heavy-Duty Low NOx Omnibus regulations adopted by the California Air Resources Board (CARB). These regulations are an essential policy tool for addressing climate change and improving air quality in Washington.
These proposed amendments respond to industry concerns by easing compliance requirements for the heaviest vehicles. They also streamline implementation and maintain consistency with state and federal laws. The Advanced Clean Trucks program applies to medium- and heavy-duty engine and vehicle manufacturers. It requires manufacturers to gradually sell more new zero-emission models in Washington through model year 2035, and provides flexibility by allowing manufacturers to purchase credits from other manufacturers to meet this requirement and choose which models to transition to zero-emissions technology. The Heavy-Duty Low NOx Omnibus regulation applies to heavy-duty internal combustion engine manufacturers and requires them to meet more protective air quality standards, particularly on oxides of nitrogen and particulate matter, starting in model year 2026.
Comments are accepted from May 15, 2025 at 12:00 AM to July 3, 2025 at 11:59 PM. Visit the Chapter 173-423 WAC webpage here.
Contact Information
*Indicates Required Fields