This picture was sent to me from Scott (don't know his last name), from Snoqualmie Summit Ski area in the pass. Notice the excellent visibility in the dry air. And you won't believe the latest Seattle profiler imagery...the inversion continues to descent (see image), with a base near 400 m (1300 ft). How low will it go?

Air quality is still fine, but how long can it keep up with such a low inversion. If air quality remains ok there is only one explanation, the people of the region are reducing their burning.