Those who typically walk or jog to work are advised to consider taking a bus or Skytrain instead until the air quality improves.
The Minnesota Department of Health said in a 2015 report that air pollution like that from wildfires - specifically, small particulates - contributed to more than 2,000 deaths and 600 emergency room visits in 2008 alone.
"The trend is clear. It's going to be somewhere".
The Federal Aviation Administration said planes bound for the Sea-Tac International Airport, Seattle's main airport, may be delayed because of low visibility.
Air quality monitoring stations in Yakima, Toppenish, Sunnyside and White Swan are all reporting air quality as "hazardous".
The Puget Sound Air Agency said no outdoor burning is allowed as of 5 p.m. Monday in order to reduce any additional harm from excess air pollution.
Those with chronic underlying medical conditions are recommended to avoid strenuous exercise and time outdoors until the advisory is lifted.
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