FILE - In this Sept. 18, 2019, file photo, California Air Resources Board Chair Mary Nichols, with California Gov. Gavin Newsom at left, discusses the Trump administration's pledge to revoke California's authority to set vehicle emissions standards that are different than the federal standards, during a news conference in Sacramento, Calif. Nichols' term leading the state ARB ends in December 2020. She's held the role since 2007 after an earlier stint as chair in the early 1980s. (AP Photo/Rich Pedroncelli, File)
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