Friday brings us another typical summer day for PM2.5 pollution in Beijing. We should spend the morning at Unhealthy or Very Unhealthy, then we should see PM2.5 levels drop in the late morning and early afternoon. We could drop into Unhealthy for Sensitive Groups or even Moderate if the weather conditions are just right, but we could also see a repeat of Thursday when PM2.5 levels hovered in the Unhealthy range all day.
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