Written Question·Department for Transport·UIN 71562
Clean Air Zones: Enforcement
Tabled: 29 August 2025
Answered: 5 September 2025
Question
Liz Jarvis
Liberal Democrat — Eastleigh
To ask the Secretary of State for Transport, what assessment she has made of the effectiveness of clean air zone enforcement policies.
Answer
Lilian GreenwoodClean 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 Penal...
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