Since the Uxbridge and South Ruislip by-election at the end of July, low emission zones and 20mph speed restrictions, have been in the limelight. So much so that Rishi Sunak, the prime minister, declared that he is on the side of the motorist and called for a review of such schemes.
In any review, scientific evidence should play a prominent role in decisions about future policy, and although the politics of the issue are bound to stand out in strong relief, the scientific arguments also deserve
