Clean Air Zones: Enforcement
(asked on 29th August 2025) - View Source
Question to the Department for Transport:
To ask the Secretary of State for Transport, what assessment she has made of the effectiveness of clean air zone enforcement policies.
This question was answered on 5th September 2025
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.