The Mayor of London, Sadiq Khan, is taking tough measures to tackle London’s air quality crisis, and believes it’s important that Londoners are made aware of episodes of high pollution levels. Since his election in 2016, Khan has implemented an alert system that makes use of roadside message signs alongside London’s busiest roads, electronic updates at underground stations as well as social media and text alerts.
During such episodes drivers will be instructed to turn their engines off when stationary in order to reduce emissions.
The most recent high pollution alert was on the 26th of February 2019. This episode was deemed to be due to local emissions being poorly dispersed, combined with an influx of particulates from France and Germany.