Central London Ultra Low Emission Zone – Four Month Report

This report evaluates the impact of the central London Ultra Low Emission Zone (ULEZ) in its first four months of operation. The data behind the report is also available for download.



In July 2019 the average compliance rate with the ULEZ standards was around 73 per cent in congestion charging hours and 75 per cent in a 24 hour period. This is much higher than 39 per cent in February 2017 and the 61 per cent in March 2019 (congestion charging hours).