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California needs the waivers to meet pollution standards for ozone and fine particulate matter. The South Coast basin has never met the federal ozone standard and can’t meet one that was set in 1997, let along two tougher standards enacted since then. The Central Valley also violated the ozone standard. Heavy duty trucks.
emissions, and just under 15 percent of climate-warming greenhouse gas emissions from the states on-road vehicles. EPA 2024 Additionally, emissions of climate-warming greenhouse gases from trucks are on the rise, up nearly 80 percent in the past 3 decades compared to a less than 10 percent increase among light-duty passenger vehicles.
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