Heavy-Duty Engine Emission Standards for Highway Trucks and Buses
From the document, "The United States Environmental Protection Agency (EPA) is proposing a new combined emission standard for oxides of nitrogen (NOx) and hydrocarbons (HC) from heavy-duty engines designed for highway trucks and buses. EPA estimates that the proposed standard would reduce NOx emissions by 50 percent which would significantly assist states in meeting and maintaining the ozone standard. The consultation and consensus building activities which EPA undertook in this initiative culminated in widespread support from the engine and trucking industries, states, and the environmental community." This is a US federal gov't document.
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