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<p>Tackling air quality is a priority for this Government and we are committed to
meeting air quality limits for nitrogen dioxide in the shortest possible time. Defra
and the Department for Transport work closely together at all levels to embed air
quality considerations in the development of transport policy and delivery, including
in relation to vehicle emissions. The inter-Ministerial group on Clean Growth meets
as and when required and its members include Ministers and officials from the relevant
departments, including Defra and the Department for Transport.</p><p> </p><p>The Government’s
comprehensive National Air Quality Plan (www.gov.uk/government/publications/air-quality-in-the-uk-plan-to-reduce-nitrogen-dioxide-emissions),
published in December last year, is based on the best available evidence and uses
the latest COPERT (Computer Programme to Calculate Emissions from Road Transport)
(4v11) factors to calculate emissions from diesel cars.</p><p> </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 more accurately reflect the difference
between real world driving and laboratory test conditions.</p><p> </p><p> </p>
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