13 Sep 2020. West Coast. Portland’ air quality index (AQI) reaches 516 (vs. East Coast: 14) after 100-day chaotic restlessness
(quote)
The breathability of Portland’s air significantly worsened overnight and into Sunday, reaching 516 on the air quality index in the hardest hit parts of the city, according to the U.S. Environmental Protection Agency.
That measurement is off the charts, which top out at 300