California's plan to clear regional haze is not good enough, says US environmental regulators

The US environmental regulators have partially rejected California's plan to reduce regional haze, which is air pollution that makes distant objects look blurry. This means California must now strengthen its strategy to improve visibility in national parks and wilderness areas.

California has been trying to clean up its air for decades, but this decision means its current approach to regional haze is insufficient. The state will now have to find more aggressive ways to cut emissions from sources like power plants, industrial facilities, and vehicles. This could lead to new regulations or stricter enforcement for industries operating in California.