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The Guardian7 March 2025
Dramatic fall in London’s levels of deadly pollutants after Ulez expansion
86
Usefulness score
Highly UK‑focused and widely recognisable (London ULEZ) with concrete official data and clear links to externalities and government intervention, making it very strong for A‑level application.
Summary
A Greater London Authority report finds London’s air pollution has fallen markedly since the Ultra Low Emission Zone (ULEZ) was expanded to all boroughs in August 2023. Roadside NO2 is down 27% across London since 2019, PM2.5 in outer London is 31% lower than without the 2023 expansion, 99% of monitoring sites show improvement, and 97% of vehicles are now compliant, with notable benefits in deprived areas and reductions in CO2.
Application
How to use this in an exam answer.
Use this as a UK case study of a Pigouvian charge correcting a negative externality from motoring: a £12.50 daily charge on high‑emission vehicles raises private costs, reduces use of polluting cars, and improves health outcomes. Quote figures (e.g. NO2 down 27%, PM2.5 31% lower in outer London) to show effectiveness, and note distributional impacts with larger gains for deprived areas and high compliance (97%).
Evaluation
How to critically assess it.
Causality may be confounded by other policies (cleaner buses/taxis, national emissions standards) and broader trends; improvements might not be solely due to ULEZ. Charges can be regressive for low‑income drivers who own older cars, though scrappage schemes and health gains in deprived areas counter this; there may also be displacement of older vehicles outside the zone. Revenues may fall as compliance rises, and enforcement costs and political opposition highlight implementation trade‑offs.