Tag Archives: NOx Emission

EPA and NHTSA Finalize Stringent Emission and Fuel Efficiency Standards

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Yesterday, the U.S. Environmental Protection Agency (EPA) and the National Highway Traffic Safety Administration (NHTSA) finalized more stringent greenhouse gas (GHG) emission standards and fuel efficiency standards for medium- and heavy-duty engines and vehicles.  This “Phase 2” rule, applies to: 1) combination tractors; 2) trailers pulled by combination tractors; 3) heavy-duty pickup trucks and vans; and 4) vocational vehicles, such as buses, garbage trucks and concrete mixers, as well as engines that power combination tractors and vocational vehicles, and covers model years 2021 through [...]Read more

NOx Emission Reductions for Medium- and Heavy-Duty Trucks Forthcoming

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The timeline for federal NOx emission reductions for medium and heavy-duty trucks is uncertain, but expected in California in 2017.  The California Air Resources Board (CARB) is expected to issue a NOx standard in 2017 that should reduce NOx emissions by up to 90 percent:  the expected lower standard is 0.02 grams per brake horsepower hour (g/bhp-hr), a significant decrease for the current 0.2 g/bhp-hr.  Under the Clean Air Act (CAA), California may issue emission standards that are more stringent than federal standards.  While California is the only state with such authority, other states [...]Read more