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Tsinghua study concludes existing regulations for diesel trucks and buses insufficient to reach NOx reduction target by 2015

According to report from a team at Tsinghua University, recently published by the the International Council on Clean Transportation (ICCT), real-world emission factors of CO, HC, and PM from diesel trucks and buses in China have been reduced significantly as emission standards have become more stringent from Euro 0 to Euro III.

However, Euro II and Euro III trucks and buses have failed to show a reduction in NOx as regulated by the standards compared to Euro 0 trucks and buses. Therefore, the researchers suggested, the existing regulations are not sufficient to fulfill China’s target of reducing NOx emissions by 10% by 2015 as compared with 2010.

This trend is [exacerbated] when considering the future growth in the truck population and annual driving distance of individual trucks, which are projected to grow by 20% and 10%, respectively, from 2010 to 2015 (Huo et al, 2012). More stringent NOx requirements (e.g. Euro IV and Euro V) need to be considered to mitigate this problem. Euro IV control technologies can achieve a reduction in NOx emissions of 12-40% compared to Euro III technologies. The Euro IV requirements were delayed by two and a half years in China due to fuel quality problems, and only finally became effective in July 2013.

—“Investigation of Diesel Emissions in China”

Background. In 2012, ICCT supported Tsinghua University in the investigation of emission factors of diesel vehicles in China. The project included a careful review and summary of all available existing on-road emissions data for China (more than 300 vehicles), new PEMS (Portable Emissions Measurement System) measurements of twenty older diesel vehicles, and comparison of real-world emissions data against existing inventory studies.




The best fuel for trucks is turning out to be compressed gas and definitely not diesel or gasoline.

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