From the article: Starting next August, drivers of the most polluting vehicles will have to pay $15 per day to enter an Ultra-Low Emissions Zone expanded to include all of metropolitan London, the British capital’s mayor announced Friday.

“Cleaner air is coming to Outer London,” Mayor Sadiq Khan tweeted. “Today I’m announcing that we’re expanding the #ULEZ London-wide in a move that will bring cleaner air to five million more Londoners.”

“Our city is being smothered by toxic air—and it’s hurting and killing Londoners, leading to asthma, dementia, and even cancer,” the mayor continued. “Air pollution particles have even been found in the livers and brains of unborn babies. We cannot stand idly by and allow this to continue.”

“Around 4,000 Londoners die prematurely each year because of long-term exposure to air pollution, with the greatest number of deaths in outer London boroughs,” Khan added. “That’s why this expansion is so important—we need to clean the air for everyone.”

London Public Health Director Kevin Fenton tweeted that “air pollution is the largest environmental risk to public health in the U.K… It affects everyone who lives and works in London, and its impacts are felt throughout the life-course from before birth to old age.”