Berkeley Earth

California now has the most polluted cities in the world.
Josh Edelson/AFP/Getty Images via CNN
November 16, 2018 - 6:14 pm
By Arman Azad (CNN) — Due to the wildfires raging in Northern California, San Francisco, Stockton and Sacramento were the world's three "most polluted cities" on Friday morning, according to Berkeley Earth , a nonprofit that aggregates data from air-quality monitoring sites. PurpleAir , which has a...
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