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EPA grants California waivers for two clean vehicle regulations

The US Environmental Protection Agency (EPA) has approved waivers for two California clean vehicle regulations that will allow the state to implement and enforce its Advanced Clean Cars II (ACC II) regulations for light-duty vehicles, and its “Omnibus” low-NOx regulation for heavy-duty highway and off-road vehicles and engines.

Under the Clean Air Act, California is afforded the ability to adopt emissions requirements independent from EPA’s regulations to meet its significant air quality challenges. The state must seek a waiver from EPA for new motor vehicle emission standards.

The ACC II program is a single coordinated package of requirements for model year 2026 through 2035 and beyond for on-road light- and medium-duty engines and vehicles. The ACC II regulations include revisions to both California’s Low Emission Vehicle (LEV) and Zero Emission Vehicle (ZEV) regulations.

CARB projects that the ACC II program will reduce smog and soot-causing pollutants—including fine particulate matter (PM2.5) as well as oxides of nitrogen (NOx) and hydrocarbons (HC), which are precursors of ground-level ozone—as well as reduce greenhouse gases and toxic air pollutants.

CARB projects that its Low-NOx standards will protect communities from NOx pollution that mixes in the atmosphere to form ground-level ozone, commonly called “smog,” which can lead to costly and harmful health impacts such as increased illnesses, asthma attacks, lost days of work or school, and hospitalizations.

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