According to a new study by Imperial College, the Ultra Low Emission Zone (ULEZ) had minimal impact on air pollution in London.
The researchers used publicly available air quality data to measure changes in pollution in the twelve-week period from 25 February 2019, before the ULEZ was introduced, to 20 May 2019, after it had been implemented. They controlled for the effects of weather variations, and then used statistical analysis to look for and quantify changes in pollution.
They found that, compared to the overall decrease in London’s air pollution levels, the ULEZ caused only small improvements in air quality in the weeks following its start date: an average reduction of less than 3 per cent for nitrogen dioxide concentrations, and insignificant effects on ozone and particulate matter (PM2.5) concentrations. They also found that the biggest improvements in air quality in London in fact took place before the ULEZ was introduced in 2019.
Although London’s air quality has been substantially improving in recent years, that improvement is down to other factors such as newer vehicles in use, and central Government measures such as tax incentives. The ULEZ scheme, and particularly its expansion to cover a lot of outer London, was never justified on a cost/benefit analysis. See our analysis of the ULEZ here: https://www.freedomfordrivers.org/environment . Its introduction was clearly motivated by financial revenues to the Mayor and TfL, not by health benefits.
You can read more details of the study from the link below but the comment that air pollution in London causes 4,000 deaths per year is simply wrong.
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