The agency adds that air quality is expected to be poor throughout the week as well.
The agency is advising people to avoid outdoor activity - especially young children, the elderly and people with respiratory problems.
When air quality reaches unhealthy levels you might think just because you are inside you will not be affected by the smoke, but there are steps you can take to make sure you are not affected.
Nineteen wildfires are burning across more than 300,000 acres in Washington and OR, filling the skies with thick smoke.
Last week, Alberta Health Services issued a precautionary air quality advisory for the entire province.
Much of the smoke that has blanketed the region is from wildfires in British Columbia, said National Weather Service meteorologist Art Gaebel.
Still, experts say that relief is on its way.
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An air quality statement remains in effect for Wednesday's weather forecast across Metro Vancouver. High temperatures will drop into the upper 70s and low 80s.
The free OregonAir app uses smiling or frowning face emojis to quickly show air quality across the state.
Smoky conditions have become so prevalent during wildfire season in the Northwest, there is even a blog dedicated to it.
Close windows in your home, if possible, and keep the indoor air clean. Try running your air conditioner and set it to re-circulate the air - the idea is to keep the air moving and keep it cool.
All outdoor burning is banned countywide.
Kenworthy says people should be prepared for smoky conditions for a couple months.
It's the latest outcome of yet another year of devastating wildfires.