Beginning in January 2009, which US state was granted a waiver exempting it from US federal emission legislation causing it to enact its own mandatory limits?

Name: Beginning in January 2009, which US state was granted a waiver exempting it from US federal emission legislation causing it to enact its own mandatory limits?
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Question

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California was granted a waiver to set its own stricter vehicle emissions standards, separate from federal regulations.

Beginning in January 2009, Which US State Was Granted a Waiver