London Mayor Sadiq Khan has done something daring to tackle air pollution in his city. First, he experimented with an Ultra-Low Emission Zone (ULEZ), with an area designated as a congestion charging area about 25 years ago. This experiment was launched in April 2019, and the rules were aimed at discouraging high-polluting motor vehicles from entering the area, with the imposition of penalties for violations. From October 25 this year, after two years of experimentation, the mayor extended the ULEZ to an 18 times larger area; the scheme is now known as Extended Low Emission Zone (ELEZ). There's little doubt that Londoners are now adopting one of the most radical anti-pollution policies in the world. The government estimates the number of people killed by long-term exposure to air pollution in the UK to be as high as 30,000 a year. Reports suggest that many other cities in the UK are now planning similar low emission zones. Under the new scheme, motor vehicles, except larger buses, l...