A new documentary, "Under the Dome", goes viral in an anxious China

As a famed news anchor, Chai Jing regularly reported on China's environmental woes. But it was when she found her daughter had grown a tumour while in her womb that things became personal.She quit her job at state broadcaster CCTV, which had made her an instantly-recognisable celebrity, and launched into a one-year investigation into the human cost of China's notorious air pollution. Read