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Sep 14, 2020, 7:57 am153 pts
EcoWatch
The wildfires raging across the West Coast have made the air quality so bad in several U.S. cities that they rank among the worst in the world. In fact, the air quality in Portland, Oregon was so bad on Sunday that it went off the charts when it passed 500 on an air quality index. Anything in the 300 to 500…
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