This is what “world class” cities do:
The Paris Breathes campaign, responsible for implementing the program, blocks off 13 sections of the city at various times throughout the day. Sections are closed for various time periods ranging from four to 10 hours, according to the campaign’s website. There are an additional four locations that go car-free for the summer months only. The first car-free day—Sept. 27, 2015—led to a 40 percent drop in nitrogen dioxide in Paris, The Guardian reported.