What is Clean Diesel?


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June 05, 2017   |   Automotive Testing Technology International

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Allen Schaeffer: Out with the old, in with the new


In the USA, new technology diesel trucks and buses have reduced NOx emissions by more than 95% compared to older models. Today, it would take 60 new diesel trucks to equal the same emissions from one pre-1988 truck.


NOx emissions are just one of several contributors to air pollution, including ground level ozone. There are many sources of NOx emissions, including power plants, industrial activity and mobile sources such as cars, trucks and off-road equipment. According to US EPA, emissions of oxides of nitrogen have fallen by 61% since 1980. In 2016 US EPA reviewed the current NO2 national ambient air quality standards and in its policy assessment, recommended that no changes to the health-protective standard are needed as existing control measures continue to contribute to declining NO2 emissions.


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