The tower has been built in Xian in Shaanxi province and is undergoing ... The head of the research, Cao Junji, said improvements in air quality had been observed over an area of 10 square ...

Cao has submitted a proposal for another 300-metre tower in Xian. He is also negotiating proposals with cities in Guangzhou, Hebei and Henan. But the technology has its sceptics, who say that ...

his first comments to media since he was detained on May 25, Choi Jinseog elaborated on his defence plan and said the allegations against him regarding the Xian plant were not substantiated.