The story for Thursday will be increasing PM2.5 levels, but there is a chance that we can hold on to Wednesday's good air quality for part of the day. Pollution levels should remain low overnight, but we could see the air quality begin to deteriorate as early as sunrise. We expect it will take a bit longer than that, but by noon we should be on our way back up. We should see Unhealthy air quality by sometime in the evening, and we could even make it up to Very Unhealthy before midnight.
UPDATE – Our prediction with overlay of actual readings:
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