Air quality in Beijing and other areas of northern China is reaching dangerous levels due to smog conditions and sandstorms. NBCNews.com's Dara Brown reports.
Adrian Bradshaw / EPA
People in Beijing endure a noxious and potentially dangerous mix of sand and fine particulate pollution on Thursday, after a sandstorm blew in from the Gobi Desert.
Feng Li / Getty Images
A composite photograph shows Beijing's skyline during Thursday's sandstorm, top, and during good weather on Feb. 19.