In Finland the VTT institute performs environmental test of new and old buses. They have built a valuable database and can nowadays draw very detailed conclusions concerning emissions of nitrogen oxides, particulates, greenhouse gases and fuel consumption. Lots of myths can be terminated by the VTT environmental studies.
Today VTT, with presentations by Kimmo Erkkilä and Nils-Olof Nylund, hosted a seminar where both projects from the present and the past were summarized. It can for example be seen that the fuel consumption from Euro I to today has not improved dramatically. Only for Euro IV, the introduction of AdBlue enabled some reduction. It is also seen that gas buses have historically had much lower emissions than diesel buses. However, as the absolute emissions decrease the difference in absolute terms also decrease.
It was said that VTT is about to publish one of the most detailed reports on environmental performance of buses for public transports ever and I expect it to become a reference book for environmental impact of buses. It is expected to bring important information to public transport authorities as well as operators and bus manufacturers. I will look out for this publication when released in the beginning of the summer.
I got the task to review future trends with focus on electro mobility. The Volvo hybrid has now been on sale for more than a year and the sales have escalated gradually. Volvo Buses is very proud and honored by the warm reception all over the world. We have now sold about 450 Volvo hybrid buses with the in-house ISAM technology. Apart from the radical fuel saving, the electric start function that allows silent and emission free take-off from bus stops has brought most appreciation lately. The reliability, better than diesel, is now taken for granted.