Abstract:

The Dutch research institute TNO published a report at the end of 2003 on emissions from four fuels: diesel/gasoline/LPG/CNG. The measurements involve all relevant emissions: regulated and non regulated.
This report is the new reference all over Europe since it replaces the research done in 1993 on this subject.

The measuring concerns 8 OEM Light Duty vehicle, up to date models, all on the three fuels diesel/gasoline and LPG. When we from NGV-Holland were attended on this running program, by the ministry of environment, we still were able with limited funds to join in with three models on CNG.

Of great interest is the comparison of exhaust in all three different test modes ( related to real use with cold start a.t.l.) as well as developments since 1993. The paper will highlight the results on the following questions:
Is it true that diesel and gasoline technology will improve so fast that CNG could be overtaken in a few years?
Is CNG able to compete with other alternative fuels and measures like speed reduction and particulate filters, due to climate, health and ecological aspects?
Is CNG an automotive fuel with potential for now and in the future to contribute to the Kyoto agreement and smooth the path into the hydrogen era and effect positively the reduction of life expectation? (Recent research established that people living not too far from highways will find a shortage of life expectation by two years in the Netherlands.)

The presentation will also highlight the meaning of the methane component in the CNG exhaust as well as misconceptions on importing exhaust by wind of NO2 and PM.

Presentation: http://www.cleanairnet.org/baq2006/1757/docs/SW5_2.ppt

Full paper:

Vehicle Exhaust Emission Comparison on Four Fuels [.doc, 1494.5Kb]