Wednesday brings us a few more hours of poor air quality, but then we should see clearing skies. PM2.5 levels could start dropping as early as about 3AM, but it's likely to be closer to about 7AM and could be as late as about 9AM. In any case, we should have clear skies by noon (assuming the incoming system doesn't create a sandstorm) and for the rest of the day.
UPDATE – Our prediction with overlay of actual readings:
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