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California environmental regulators have issued an accelerated plan to mandate that truck manufacturers transition a portion of their sales from heavy diesel trucks to electric zero-emission vehicles beginning in 2024.

The California Air Resources Board started an initiative to promote zero-emission freight equipment at transportation hubs, such as ports, distribution centers, airports and rail yards.

Just when will heavy-duty electric trucks be ready for prime time, and when will motor carriers purchase them?

Last week, President Donald Trump proposed gutting California’s unique ability to write greenhouse gas emission limits for cars and trucks.

California air-pollution regulators want to meet with Trump administration officials over plans to ease federal auto-efficiency standards, saying in a letter to the White House that efforts to undermine the state’s authority would run afoul of the law.

The California Air Resources Board has approved amendments to toughen state standards on heavy truck smoke opacity limits as well as require motor carriers with two or more trucks to report their annual smoke test results to the agency.

Over and over in their decadeslong war on smog, Southern California regulators have failed to use a powerful tool against ports, warehouses and other freight and logistics hubs that are magnets for air pollution.

The Trump administration announced that fuel-efficiency regulations for cars and light trucks are too stringent and must be revised, formally beginning a process sought by the U.S. auto industry to rollback anti-pollution targets.

The Trump administration will argue that the high cost of meeting Obama-era fuel economy standards discourages motorists from trading in less-efficient vehicles, as it sets about weakening the rules, said people familiar with the discussions.