Photo: Flickr.com / Simon Smiler PD
London’s ULEZ cuts NO2
Since the introduction of an Ultra-Low Emission Zone (ULEZ) in April 2019, nitrogen dioxide (NO2) concentrations in London have been cut by a third, according to a City Hall report. Quarterly averages reveal that levels of NO2 on roadside monitors have fallen by 36 per cent, from 89 μg/m3 in January to March 2017 to 57 μg/m3 in July to September 2019. Levels of fine particulate matter (PM2.5) have fallen only slightly, with the report saying that over half of London’s PM2.5 is blown into the capital from outside sources.
The London Mayor Sadiq Khan plans to expand the zone’s boundary in 2021 should he be re-elected next year.
Source: Car Lines, No 9, 2019