"The Environmental Protection Agency’s draft proposal to relax federal auto emissions standards sets up a legal clash with California, which has pledged to stick with stricter Obama-era targets.

The state holds a waiver under the Clean Air Act that allows it to set its own standards for exhaust pollution from cars, trucks and S.U.V.s. California officials have said they will fight in court any attempt by the Trump administration to revoke or bypass the waiver. Here are the three big issues for the state.

California’s tailpipe regulations are a key component of its broader climate plan to cut emissions 40 percent below 1990 levels by 2030."

Nadja Popovich reports for the New York Times April 30, 2018. [2]