Has ULEZ made any difference to air quality in London?

London’s air may not be as clean as official Defra figures suggest, with local council monitoring showing parts of the capital are still breaching legal nitrogen dioxide limits despite years of ULEZ.According to the Daily Mail, the discrepancy comes from the way national and local air pollution data is collected.Defra assesses air quality using modelling and measurements from around 200 Automatic Urban and Rural Network stations across the UK, with London treated as one large region and c