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In a statement Friday, he said the new rule was "only the beginning" of the state's work to reduce air pollution.
Colorado OKs electric car requirement to fight air pollution →
The move was expected after Democratic Gov. Jared Polis said in March the state would no longer ask for an exemption from the standards by claiming some of the pollution was drifting from China and elsewhere, rather than being created in Colorado.
Denver, northern Colorado fall short on US clean air rules →
