Appropriately enough for Halloween, our forecast for Thursday is grisly. We're starting the day off with Very Unhealthy air quality, and we're expecting only deteriorating conditions for the rest of the day. We're expecting Hazardous PM2.5 levels by the afternoon and evening, not the conditions we wanted for trick-or-treating. But we hope you still have enough time to change your costumes to somehow include the fog/smog in your theme . . .
UPDATE – Our prediction with overlay of actual readings:
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