The good air quality of the past few days will be gone on Wednesday as we're back to Unhealthy and Very Unhealthy Conditions in Beijing. Look for increasing PM2.5 levels overnight that, depending on which weather forecast proves correct, could bring us up to Very Unhealthy conditions before sunrise. In the worst-case scenario, we'll spend almost the entire day at Very Unhealthy conditions, but our best-case scenario would leave us entirely in the Unhealthy range. Regardless how poor our air quality is tomorrow, we're looking for another clearing to come through on Thursday, so this round of misery should be short.
UPDATE – Our prediction with overlay of actual readings:
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