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The state’s environmental tool skews which communities are designated as disadvantaged, researchers say. Some immigrant neighborhoods could be left out, while other groups are overrepresented.

They want the agency to update its emission standards and tighten its oversight.

The move is one piece of California’s mission to cut emissions and targets the largest source of air pollution in the state, which comes from vehicles.

Truck manufacturers won’t file legal challenges over California’s controversial mandate, and in return, the state air board will relax some smog-fighting requirements.

In a worldwide first, California’s air board unanimously moves to end diesel’s decades-long stranglehold on the economy. Truckers predict chaos, while communities near ports, freeways celebrate cleaner air.

California leads the charge nationally when it comes to pushing vehicle electrification forward. It makes sense given the fact that vehicles are the primary source of pollution in the state, especially as it’s also home to the largest auto market in the country.

Two of Oregon’s most economically disadvantaged and racially diverse communities — one in Portland and the other near Coos Bay — are getting a boost in their fight against air pollution.

Opponents clashed over a state proposal to ban gas-fueled truck sales and make large trucking firms convert to electric within two decades.

In another worldwide first, California would require new trucks to be zero-emissions in 2040. Large companies would gradually convert fleets. Truckers worry about the costs and practicality of electric trucks.

California’s environmental justice law is supposed to clean the air for 15 hot spot communities, home to almost 4 million people. But after more than 4 years and $1 billion, it’s still impossible to say whether it’s worked.

Environmental advocacy group Food and Water Watch says clean air violations by Oregon’s largest dairy should disqualify it from participating in California’s low-carbon fuels program.

California’s air board enacted two first-of-their-kind smog rules for trucks and lawn equipment. They’ll cost billions but cut tons of emissions.