A. Under the US Clean Air Act, the state of California is allowed to petition the federal government for a waiver to set its own stricter standards for tailpipe emission and fuel economy.
B. Thirteen states have joined California in applying to the EPA, while three others have said that they will impose the standards if the waiver is granted.
C. The move has not been popular with American car makers, who successfully argued to the Bush administration that rising standards would cripple the industry.
D. Other states can choose to adopt California's standards or stick with federal rules.
E. That accounts for nearly half the country's auto market, thus forcing car manufactures worldwide to conform to stricter standards.
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