Another year, another Beijing winter. As winter arrives to Beijing, I got to wondering: how much worse is winter air?
To get to the bottom of it, I analyzed the last seven years of US Embassy PM2.5 data. I found that the capital’s air has averaged 111 micrograms in the winter versus 92 micrograms for the rest of the year.
Just how bad is that? The WHO 24-hour PM2.5 limit is 25 micrograms. That means Beijing’s summers average three times the limit, and winters average over four times limit.
Breathe safe this winter!
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