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In page Clean Air Act (United States):
"The Motor Vehicle Air Pollution Control Act (Pub. L. 89–272) amended the 1963 Clean Air Act and set the first federal vehicle emissions standards, beginning with the 1968 models. These standards were reductions from 1963 emissions levels: 72% reduction for hydrocarbons, 56% reduction for carbon monoxide, and 100% reduction for crankcase hydrocarbons.[citation needed]. The law also added a new section to authorize abatement of international air pollution.[2]
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