Democratic Gov. John Hickenlooper told state regulators begin writing rules that incorporate California's low-emission vehicle standards, with a goal of putting them in place by the end of the year.
Hickenlooper said strict emissions standards are important to Colorado, citing climate change and noting the state's elevation makes pollution worse.
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The states that currently apply California's rules are Connecticut, Delaware, Maine, Maryland, Massachusetts, New Jersey, New York, Oregon, Pennsylvania, Rhode Island, Vermont and Washington.
"Colorado is recognizing along with other states that the federal rollback is both unjustified and harmful, so the governor is joining others in protecting his state's citizens," Tonachel said.