Euro 5 Impact Assessment - Automotive Industries Association of ...

• In addition, the 5 mg/km limit is in line with the standards proposed for lean-burnpetrol vehicles.- 200 mg/km emission limit value for NO XThe reasons for selecting this emission limit value are as follows:• It is the lowest limit that can be achieved without requiring the installation of a NO Xafter-treatment device on most of the vehicles.• The pace of replacement of older, more polluting vehicles is crucial for improving theair quality. The proposal already specifies a PM limit value that would necessitate theinstallation of a particulate filter.• Any lower NOx limit would require the additional installation of a NO X aftertreatmentdevice and would imply a considerable increase in costs that could slowdown the turnover of the existing fleet.• A relatively higher increase in the price of a diesel vehicle might result in a shift of thedemand from diesel vehicles towards petrol cars.• The lower share of diesel vehicles would have a negative effect on the reduction ofgreenhouse gases, as petrol vehicles emit considerably more CO 2 than diesel vehicles.• The improvement in CO 2 emissions that Europe has seen in recent years and whichwas to a large degree due to an increasing market share of diesel vehicles. Substantialchanges in the current balance between petrol and diesel vehicles would then risk thereductions in CO 2 emissions that have occurred so far..6.5.2. Petrol Emission LimitsThe impact assessment has shown that further tightening of the emission limits for petrolvehicles is justified. Reducing emissions further can be simply achieved through betteroptimising the after-treatment system – which is a longstanding and well proventechnology. The impact assessment shows that a HC emission limit value of 75 mg/kmand a NO X value of 60 mg/km is the most cost-effective scenario for petrol vehicles.- 75 mg/km emission limit value for HC• The information provided by stakeholders suggested that there was no cost differencebetween keeping the limit value at 100 mg/km and reducing it to 75 mg/km.• However, further reduction of the limit would impose higher costs.- 60 mg/km emission limit value for NO XA NO X limit value of 60 mg/km was selected for the following reasons:• It provides for a high level of environmental protection.• It ensures the affordability of vehicles for the consumers. This way, the turnover rate ofthe existing fleet can be maintained and therefore, the improvement of air quality isensured.30