Mary D. Nichols, thechairwoman of the Air Resources Board, the state agency charged with putting California’s 2002 law on vehicular emissions into practice, said the suit was filed quickly because “the states didn’t want to sleep on their rights.”  California regulators, Ms. Nichols added, have just calculated that in 2016, the state’s standard would reduce carbon dioxide output by 17.2 million metric tons, more than double the 7.7 million metric tons that would be eliminated under the new federal fuel-economy standard.  California’s cumulative reductions from 2009 through 2016 would be 58 million tons, she said — triple the reductions the federal standards would provide.  The environmental agency had no immediate reaction to the new calculations, but it did put out a statement in response to the lawsuit, saying in part, “As the administrator indicated” in the Dec. 19 decision, “we now have a more beneficial national approach to a national problem which establishes an aggressive standard for all 50 states, as opposed to a lower standard in California and a patchwork of other states.”  Ms. Nichols pointed out, in a telephone news conference, that the Clean Air Act did not permit a patchwork of individual state regulations; it permits California to have independent rules on air pollutants, and permits other states to choose between the federal standards or more stringent standards set by California.  California’s attorney general, Jerry Brown, added that the word “patchwork” was “completely untrue.”  “California’s got the only” greenhouse-gas emission standard “in the country,” Mr. Brown said.  The lawsuit was joined by New York, New Jersey, Connecticut, Pennsylvania and 11 other states as well as five environmental organizations, including the Natural Resources Defense Council.  “We think because it was a California rule, the precedents indicate the Ninth Circuit is the appropriate jurisdiction,” Mr. Brown said, referring to the United States Court of Appeals for the Ninth Circuit.  Gloria Bergquist, vice president of the Alliance of Automobile Manufacturers in Washington, disputed Mr. Brown’s assertion that there was no other nationwide standard set to curb emissions of heat-trapping gases.  “Congress approved an energy bill that will result in 30 percent reduction in carbon dioxide over the next 12 years, so there is a national program now,” Ms. Bergquist said. “So it isn’t a question of California not having a reduction.”  A version of this article appears in print on , on Page A14 of the New York edition with the headline: California Sues E.P.A. Over Denial Of Waiver. Order Reprints| Today's Paper|Subscribe
California sued the E.P.A. on Wednesday, challenging its recent decision to block California rules curbing greenhouse-gas emissions from new cars and trucks.