| http://www.w3.org/ns/prov#value | - EPA proposed emission standards for several groups of nonroad engines that cause or contribute to air pollution but that have yet to be regulated by EPA, including large spark-ignition engines such as those used in forklifts and airport tugs; recreational vehicles using spark-ignition engines such as off-highway motorcycles, all-terrain vehicles, and snowmobiles; and recreational marine diesel eng
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