This is a great piece of software to show the variations.
Go
here to view.
Above, the map shows regional estimates of airborne particles less than 10 micrometers wide (known as PM10) since August 1.
The scale shows the official Air Quality Index in Beijing each day.
Different countries use different words to describe ratings from the index. China considers an average measurement of 100 or below to be a "blue sky day" and describes measurements in the 101 to 200 range as "slightly polluted". The United States Environmental Protection Agency describes that same range as "unhealthy."
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