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Yes. The ‘four months on’ report showed that overall compliance rate for vehicles in the ULEZ was around 75 per cent, up from 61 per cent in March (congestion charging hours). This means that there were on average 12,524 fewer non-compliant vehicles entering the zone each day.
If you take into account Londoners who decided to comply early following the announcement of the ULEZ in February 2017 there has been a reduction of 63 per cent in the number of non-compliant vehicles, with 39,256 non-compliant vehicles in the zone in July 2019 compared to February 2017. Even before the scheme formally launched there was a measured decrease in roadside NO2 levels of around 20 per cent between February 2017 and April 2019.
I will be publishing further updates soon, including monitoring data that will show the impact of ULEZ on air pollution since the scheme came fully into effect.