Government emissions study a blow to automakers
California implemented pollution regulation before the federal government, and has been granted the authority to continue setting its own standards. Other states can choose between federal standards and California's tougher rules.
The NRC found California's approach to be both scientifically valid, and necessary because of persistent pollution problems in some parts of the state. California in 2004 approved the world's most stringent rules to reduce greenhouse gas emissions, and automakers have been lobbying hard to restrict their adoption by other states.
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