Brendan Smialowski for The New York Times

“If I am confirmed, political appointees will not compromise the integrity of E.P.A.’s technical experts to advance particular regulatory outcomes.” LISA P. JACKSON

But she evaded questions on whether as administrator of the E.P.A. she would immediately grant authority to California and 16 other states to regulate vehicle tailpipe emissions, promising only a speedy review of the issue. Nor did she directly answer questions on whether and how the agency would address regulation of carbon dioxide under the Clean Air Act, an authority granted the E.P.A. by the Supreme Court in 2007.