The California Air Resources Board (CARB) had sought waivers from the Clean Air Act to set heavy-duty vehicle and engine emission standards. California has been joined by Massachusetts, New Jersey, New York, Oregon, Washington and Vermont in adopting the rules. CARB has noted heavy-duty vehicles greater than 14,000 pounds comprised 3% of vehicles on California roads, but account for more than 50% of nitrogen oxides and fine particle diesel pollution.
The EPA said it is not yet approving California’s request to set new regulations on pollutant exhaust emission standards for nitrogen oxide (NOx) and particulate matter for 2024 and future medium- and heavy-duty engines and vehicles. Separately, California in August moved to require all new light-duty cars and trucks sold in the state by 2035 to be either electric or plug-in electric hybrids. California needs an EPA waiver for that regulation.
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