Reuters: Around one-third of the air pollution in China's smog-hit capital comes from outside the city, official media reported on Wednesday, citing a pollution watchdog.
Chen Tian, chief of the Beijing Environmental Protection Bureau, said that 28-36% of hazardous airborne particles known as PM2.5 came from surrounding provinces like Hebei, home to seven of China's 10 most polluted cities in 2013, according to official data.
The central government has identified the heavily industrialised Beijing-Hebei-Tianjin...