Friday should be Day 3 of what is becoming a familiar pattern for the PM2.5 pollution in Beijing. PM2.5 levels should increase through the morning, decrease in the late morning and afternoon, then increase again in the evening hours. We should spend most of the day in the Unhealthy range, but we could see levels at Very Unhealthy throughout the day or at Unhealthy for Sensitive Groups in the afternoon and evening hours.
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