Yellow smog alert issued, as smog blanket Beijing (4/10)

Tian'anmen Square, one of Beijing's landmarks, is blanketed in heavy smog in Beijing, capital of China, 16, 2014. The municipal government issued a yellow smog alert Thursday morning, as smog blanketed the city with air quality readings reaching the most polluted level. (Xinhua/Luo Xiaoguang)