Sandstorm pushes Beijing smog off pollution charts - CNN.com
▻http://edition.cnn.com/2017/05/04/asia/beijing-sand-storm-pollution-beyond-index/index.html
Central Beijing sits under a thick layer of smog Thursday, as a sandstorm swept north east China.
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.
Sandstorms are common across north east Asia during the spring, with prevailing winds carrying sand and dust particles from the Gobi Desert across the region.
But 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.”
By midday, the AQI level had hit a peak of 621, with PM2.5 levels of 684 micrograms per cubic meter.
[…]
Research by Nanjing University’s School of the Environment has linked smog with nearly one-third of all deaths in China, positioning it on a par with smoking as a threat to public health.
Published in November last year, the study analyzed over 3 million deaths across 74 cities throughout China in 2013.
The findings revealed that as many as 31.8% of all recorded deaths could be linked to pollution, with major cities in Hebei, the province that encircles Beijing, ranked among the worst.
