Beijing, like many Chinese cities, has not what we would ever dare call excellent air. So for the past several months, the US embassy in Beijing has been posting hourly updates on their measurements of air quality in the 'Jing via Twitter feed. Set up out of concern for the health of the embassy staff, the reports range from "good" to "very unhealthy" based on the levels of airborne pollutants (particles) that can enter a person's body.
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Beijing air is only "slightly polluted"...right.
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