China’s capital famously has some of the worst air quality on the planet. Earlier this year, NASA reported that the air quality index at the US Embassy in Beijing had hit 886 micrograms per cubic meter of air for particles of 2.5 microns or less in size. The World Health Organization considers particles of 2.5micrograms to be safe under 25 per cubic meter. An AQI above 300 is considered hazardous to all humans, not just those with heart or lung ailments. Nor is that level unusual. It has gone over 900 micrograms per cubic meter.
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