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<p>Under the NO2 Programme, local authorities with persistent exceedances of nitrogen
dioxide concentrations are required to assess and implement measures to reduce and
maintain nitrogen dioxide levels to within legal limits in the shortest possible time.
Local authorities make their assessment using rigorous transport and air quality modelling.
This is informed by impact assessments, which include the consideration of traffic
displacement, and extensive public consultation. Measures may include implementation
of a Clean Air Zone by a local authority using powers under the Transport Act 2000.
Clean Air Zones reduce the frequency of journeys taken by the most-polluting vehicles
within the zone and can increase vehicle turnover to cleaner vehicles.</p><p> </p><p>Local
authorities monitor NO2 reduction measures throughout their lifetime in collaboration
with the DfT/ Defra Joint Air Quality Unit.</p><p> </p>
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