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Emission reduction process
Links: Reducing the Traffic Noise Level Powered two wheelers in the End-of-Life Directive ACEM Unregulated Emissions Report
The emission reduction process started relatively recently for the powered two-wheel vehicles. The first stage, Euro 1, was introduced in 1999, followed in 2003 by Euro 2, and Euro 3 in January 2006.
The reduction process between Euro 0 and Euro 3 achieved a considerable 94% reduction of carbon monoxide and hydrocarbon emissions, and a 50 % reduction of nitrogen emissions. Moreover, this drastic reduction of the limit values has been coupled with more severe test cycles.
The reduction emissions process has been supported by a series of innovations such as 2-way oxidation catalyst, secondary air injection, 3-way catalyst with oxygen sensor control, electronic engine management, and fuel injection.
A comparison between PTW and car emissions performances indicates that Euro 3 motorcycle is comparable to Euro 3 passenger car. Carbon dioxide emissions (CO2), which contribute to the greenhouse effect, give another interesting comparison with passenger cars: the average CO2 emissions for petrol-engine cars are above the highest level of motorcycle CO2 emissions.
The future PTW emissions on major pollutants were researched by an independent expert chosen by the Commission: the Laboratory of Applied Thermodynamics (LAT) from the Aristotle University of Thessaloniki. LAT calculated an estimation of the PTW emissions from 1999 up to 2012 and concluded that PTW exhaust emissions show a good and very often better trend compared to the overall emissions of road transports in terms of absolute and relative figures.
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