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<p>Our Zero Emission Vehicle Transition is expected to have a transformative effect
on air quality right across our country. Over time, this transition to electric vehicles,
plus the increasing proportion of newer petrol and diesel vehicles which emit less
pollution than older petrol and diesel vehicles, will mean that levels of nitrogen
dioxide will continue to fall. Once nitrogen dioxide concentrations meet legal limit
values and Government is confident these levels will be maintained without the measure,
National Highways will be able to remove the 60mph speed limit introduced to manage
poor air quality on the westbound carriageway.</p><p> </p><p> </p>
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