The BBC road-tests the claims made by both supporters and opponents of the controversial policy.
that says the Ulez expansion will result in a "minor" reduction in NO2 pollution exposure, of 1.3%.
"There is nowhere in London still that does meet the WHO air quality guidelines, so that means everywhere you go the air you are breathing is having some impact on your health," he said. So how do they get to that figure? The WHO recommends a relative risk of a 1.08 increase for 10 micrograms per cubic metre of PM2.5.
And, as health experts keep saying, the main point is in all of this: there is no safe level of pollution. Data from DVLA, analysed by the Liberal Democrats, shows that out of the 5.8m cars registered in 10 counties near London, 1.6m are not Ulez compliant. The scheme for 2022-23 has awarded funding for 44 projects to a total of £10.7m, none of which has gone towards scrappage schemes in the home counties.
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