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Clean Air Zones: Enforcement

Asked by Liz JarvisLiberal DemocratDepartment for TransportTabled Answered 5 September 2025UIN 71562

The question

To ask the Secretary of State for Transport, what assessment she has made of the effectiveness of clean air zone enforcement policies.

Answered by Lilian Greenwood

Clean Air Zones work. Between 2019-2023, in the areas of cities that have a CAZ, NO2 concentrations have reduced by between 15% and 42%.

Local authorities are responsible for the implementation and enforcement of Clean Air Zones, for example issuing Penalty Charge Notices. Therefore, any assessment of the effectiveness of enforcement policy is a matter for them.

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