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<p>The modelling used for the air quality plan was based on the best available data
and uses the latest COPERT (Computer Programme to Calculate Emissions from Road Transport)
(4v11) factors to calculate emissions from diesel cars.</p><p>These COPERT factors
reflect that there is a difference between laboratory testing of vehicle emissions
and real world emissions. They assume Euro 6 diesel cars are, on average, emitting
2.8 times the level of emissions allowed for the Euro 6 standard.</p><p>In May, the
Government will present the results of its vehicle testing programme (www.gov.uk/government/publications/vehicle-emissions-testing-programme-conclusions)
to European Research for Mobile Emission Sources (ERMES), the body responsible for
collating vehicle emission data, to inform its updated emissions factors later this
year. This will ensure that EU-wide emission factors continue to focus on the latest
data updated on the basis of real world testing.</p>
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