Trucks and buses record "dramatic" reduction in U.S. nitrous oxide (NOx) emissions

Lucy Terry - 23 February 2012

The California Air Resources Board (CARB) reports that NOx emissions from diesel trucks and buses have reduced by 98% over the past 10 years. Emissions control methods such as Selective Catalytic Reduction (SCR) technology, and increasingly efficient engines, have contributed to this "dramatic" achievement, reports Business Week. As well as NOx reductions, sulfur emissions have reduced by 97%.

NOx emissions are regulated by the Environmental Protection Agency (EPA), and trucks are limited to an average NOx emission of 0.07g/mile. SCR is the technology chosen by most manufacturers in order to meet emissions standards; the technology works with the use of Diesel Exhaust Fluid (DEF).

The reduction in emissions is hugely significant. Allen Schaeffer, Executive Director of the Diesel Technology Forum, points out that over 80% of all freight in the U.S. is moved by diesel-powered vehicles. The Forum, a non-profit organisation that aims to raise awareness of clean diesel technology, also says that it would take 60 of today's clean diesel trucks to generate the emissions of just one pre-1988 truck.

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