CNNのインスタグラム(cnn) - 5月5日 00時57分

Beijing's air quality reached hazardous levels Thursday, as a large sandstorm swept through the Chinese capital, turning the sky a murky yellow and forcing many residents to keep indoors.

The speed with which the storm set in astounded locals -- between 3 a.m. and 6 a.m. Thursday, the city's air quality index (AQI) jumped from under 100 to over 500 -- from "moderate" to a rating of "beyond index." (Kevin Frayer/Getty Images) #beijing #China

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