Beijing enveloped in hazardous sandstorm
Beijing's official air quality index reached a maximum level of 500 on Sunday morning, with floating particles known as PM10 surpassing 2,000 micrograms per cubic metre in some districts.
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Beijing's official air quality index reached a maximum level of 500 on Sunday morning, with floating particles known as PM10 surpassing 2,000 micrograms per cubic metre in some districts. 
