We've seen PM2.5 levels rising since early this evening, but that trend should stop and then reverse in the early morning hours. Beijing's levels should drop through Unhealthy for Sensitive Groups before getting to Moderate and Good , but the weather conditions tomorrow are variable enough that we could bounce around anywhere in that range. We are most likely to see this volatility in the late afternoon, so the morning and early afternoon should be the best time to be outside.
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