Wednesday was a pleasant surprise with the Moderate AQI in the afternoon, but Thursday should be very different. We should see increasing PM2.5 levels overnight that take us up to Very Unhealthy AQIs. There should be some reduction in pollution in the afternoon, but we expect that will take us no lower than Unhealthy. Overall, it's reasonable to expect that we will spend more than half of Thursday at Very Unhealthy.
EXTENDED FORECAST
FRIDAY, February 21: More poor air quality is coming on Friday, again likely bringing us to Very Unhealthy conditions at points throughout the day.
SATURDAY, February 22: Right now, it looks as if the pollution should subside somewhat on Saturday. Although the pollution level may be lower than it was on Friday, we are expecting it to be no better than Unhealthy.
SUNDAY, February 23: The trend of poor air quality continues on Sunday, when we can expect Unhealthy or higher AQIs.
UPDATE – Our prediction with overlay of actual readings:
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