Normally overrun by cars, rather than people and bikes. Reuters/Philippe Wojazer

The radical experiment to cut smog appears to have worked.

So successful was Paris’s first “day without cars” on September 27 that the city’s mayor wants to expand the effort to help clean up the city’s terrible air quality. The single-day initiative made 30 percent of the city’s roads off-limits to automobiles, but even that minor reduction in traffic was enough to cut pollution levels—and noise—significantly.

The Guardian reports that according to Airparif, which measures city pollution levels, some parts of Paris registered 40 percent less nitrogen dioxide (which produces smog) in the air on September 27. On the bustling Avenue des Champs-Élysées, nitrogen dioxide levels were 30 percent lower than on other Sundays. And Bruitparif, which measures urban noise, recorded half as much volume in the city center as normal.

Paris has struggled with embarrassingly smoggy air at times this year, and ahead of an international climate meeting in the French capital in November, Mayor Anne Hidalgo is on a mission to clean things up.

Hidalgo wants to eliminate diesel use in Paris.

“My goal is to eradicate this harmful fuel in our city.”

Hidalgo is also shooting to get cigarette butts off the street.

Her goal for the next car-free day is to encompass a larger section of the city.

And eventually, the hope would be for Paris to have monthly car-free days, Hidalgo has said.

This post originally appeared on Quartz, an Atlantic partner site.

More from Quartz:

If You Want Your Kid to Learn, Testing Is a Good Thing

This Massive Air Purifier Vacuums Up Smog—Which Ends Up in Jewelry

Can Deforestation Be Stopped?

About the Author

Most Popular

  1. Equity

    How Poor Americans Get Exploited by Their Landlords

    American landlords derive more profit from renters in low-income neighborhoods, researchers Matthew Desmond and Nathan Wilmers find.

  2. Homes in Amsterdam are pictured.
    Equity

    Amsterdam's Plan: If You Buy a Newly Built House, You Can't Rent It Out

    In an effort to make housing more affordable, the Dutch capital is crafting a law that says anyone who buys a newly built home must live in it themselves.

  3. Transportation

    China's 50-Lane Traffic Jam Is Every Commuter's Worst Nightmare

    What happens when a checkpoint merges 50 lanes down to 20.

  4. Design

    Cities Deserve Better Than These Thomas Heatherwick Gimmicks

    The “Vessel” at New York’s Hudson Yards—like so many of his designs—look as if the dystopian world of 1984 has been given a precious makeover.

  5. Equity

    Why Can’t We Close the Racial Wealth Gap?

    A new study says that income inequality, not historic factors, feeds the present-day gulf in wealth between white and black households.