Air quality is expected to worsen throughout the day.
Seattle's Space Needle was swathed in haze, and it was impossible to see nearby mountains.
The air quality was so bad that everyone, regardless of physical condition or age, will likely be affected, according to the Spokane Regional Clean Air Agency.
The Minnesota Pollution Control Agency has issued an air quality alert for parts of Minnesota including a portion of south-central Minnesota from 11 a.m. Monday until 9 a.m. Tuesday.
Organizers said that the Tuxedo Junction concert, scheduled to take place at the Arbor Crest Wine Cellars Sunday, had been canceled due to the air quality.
All athletic practices for Tacoma Public Schools have been moved indoors, a district spokesman said.
"Infants have very sensitive lungs when they're born so the smoke is going to be even worse for them and depending on the level of exposure, there might be damage done to infant lungs, which might have lifelong implications".
It's the second time in a week smoke from wildfires has pushed the state's air quality into unsafe level. "We now have an air quality reading of "Very Unhealthy/Purple".
With a 10+ rating, the province advises the general population to reduce or reschedule strenuous activities outdoors, particularly if you have symptoms such as coughing and throat irritation.
Children, the elderly, and individuals with respiratory illnesses are most at risk of serious health effects.
For more info on the smoke and how it affects your health, visit the Washington state Smoke Blog. "We try to stay inside as much as we can", said Diadio, "it's just too terrible out there". "We're from tornado alley, and we don't have wildfires".