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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 network of sensors around the world, also showed that California had worse air than traditional smog hotspots in India and China.CNN meteorologist Brandon Miller confirmed that "no region on Earth had as many air quality stations in the highest ranges" of particulate matter, or PM, the toxic mixture of particles and droplets that worsens after wildfires.Those values, he said, "stretched for hundreds of miles over Northern and Central California, from the mountains to the valleys and the coast."Schools, colleges and public transit have closed as smoke from the Camp Fire descends on the region."It appears to be the worst air quality ever experienced in San Francisco," said Dan Jaffe, a professor of environmental chemistry at the University of Washington. He called the situation "an air quality emergency," and experts said the smoke could undo decades of progress on pollution."We have made tremendous efforts and investment to clean up our air with considerable benefits for public health," said Dr. Daniel Jacob, a professor of atmospheric chemistry and environmental engineering at Harvard University. "But now it's like we're getting stabbed in the back with those wildfires." 1472

During her remarks at the DNC on Tuesday, Rep. Alexandria Ocasio-Cortez officially endorsed Sen. Bernie Sanders as the Democratic Party's presidential nominee — a move that some on social media claimed was an attempt to divide the party and the country.However, Ocasio-Cortez's endorsement was simply a procedural motion and something that DNC organizers had built into the convention schedule.When Sanders dropped out of the presidential race in April, former Vice President Joe Biden and his campaign allowed Sanders to hold on to his delegates as a sign of party unity. As a result, Sanders' delegates could officially cast their votes for the Vermont Democratic Socialist at the convention.Convention rules stipulate that any candidate receiving delegate votes at the convention be formally endorsed for the party's nomination prior to ballots being cast. On Tuesday, both Ocasio-Cortez and former United Auto Workers Union President Bob King formally endorsed Sanders ahead of the roll call vote.In fact, both King's and Ocasio-Cortez's speeches were listed on the DNC's Tuesday night schedule under the heading, "Nominating Speeches for Sen. Bernie Sanders."Ocasio-Cortez herself later clarified her statement in a tweet."I extend my deepest congratulations to @JoeBiden - let's go win in November," she said. 1323

Donald Glover had quite the weekend.The actor, who has been riding high these days with both his series "Atlanta" and his role as young Lando Calrissian in the forthcoming "Solo: A Star Wars Story," both hosted "Saturday Night Live" and was the musical guest as his rap/R&B alter ego, Childish Gambino. 314

Dunkin' Donuts is chowing down on the gluten-free craze.The company introduced its first-ever gluten-free bakery product: a fudge brownie. It's available in all of Dunkin's 8,500 US stores beginning Monday.Dunkin' said in a statement it recognizes "the importance of providing alternative choices for people with dietary restrictions or who choose a gluten-free diet."Gluten-free food has soared in popularity, projected to rake in billion in sales by 2020, a 20% increase from 2015, according to food industry research company Packaged Facts. (Besides those suffering from Celiac disease, there are few health benefits to a gluten-free diet.) 654

Does a picture show a polar bear getting off a bus in Russia?No.The photo going around online is real. But it actually shows a realistic puppet operated by two people and used by Greenpeace. 198

来源：资阳报