The coastal areas and Southwest Washington should wake up to clean air tomorrow morning, and the rest of Western Washington will follow shortly behind. Keep in mind that there could still be smoke from Vancouver Island fires that affects Clallam county and smoke from the Maple Fire that affects parts of Kitsap and Mason counties. Though, that should be minor compared to what has been seen the past few days. The National Weather Service is set to have the Air Quality Alert expire for all of Western Washington tomorrow at noon.
Central and Eastern Washington will likely see smoke make its way back over the state tomorrow, with air quality expected to get worse for awhile. However, this should be short-lived as westerly flow will continue to bring in some fresh air over the state. The National Weather Service is set to have the Air Quality Alert expire for most of Central and Eastern Washington at noon on Friday. The exception is for Chelan, Okanogan, and Ferry counties which will continue to see smoke impacts from nearby fires. While most of us will enjoy the smoke clearing out, the windy conditions could cause more fire growth to occur.
Check out the Environment Canada smoke forecast for the next 2 days. Their "Firework" model does a good job of accounting for Canadian smoke.