| | (Citaro with fuel cell drive) |
The economical diesel drive of this urban bus is becoming more and more "clean" due to strict emission limits. The emission standards for commercial vehicles published the EU Environment Council have already brought about a significant reduction in exhaust components.
The limits of the Euro 3 standard currently in effect are being continued in the stages Euro 4 (2005/2006) and Euro 5 (2008/2009). This ensures that diesel drive will be further developed to be extremely environmentally friendly. In Euro 5, the final stage, the particle limits will have been reduced by 98% and nitrogen oxides by 94% since 1990. |
| The commercial vehicle division of Daimler AG is focusing on the SCR (Strategic Catalytic Reduction) strategy to meet future environmental standards. The nitrogen oxide removal process relies on an aqueous solution which is sprayed into the catalytic converter. Chemical reactions turn the nitrogen oxides into nitrogen and steam. The strict limits for soot particles are observed without the use of a filter, simply by optimising combustion. This process has a positive impact on fuel consumption and does not require a maintenance-heavy filter. Saving on fuel consumption also helps reduce CO2 emissions. |
| Fuel cells, which are quiet and emission-free, may become the energy converter of the future. 30 Mercedes‑Benz CITARO buses with fuel cell drive (NEFLEET) are being operated from 2003 in ten European public transportation systems. |
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