Smog is China’s top defence against US laser weapons, says PLA Navy admiral
South China Morning Post, February 24, 2014
http://www.scmp.com/news/china/article/1434040/smog-chinas-top-defence-against-us-laser-weapons-says-pla-navy-admiral
雾霾连续五天笼罩北京 (Beijing enveloped in heavy smog for 5th straight day)
Voice of America, February 24 2014
http://www.voachinese.com/content/beijing-air-20140224/1857852.html