The tail gas exhaust from vehicles should be maintained at zero-level within a 3.8 km radius of the core Olympic area during the Games, said Wan Gang, Minister of Science and Technology, during a panel discussion at the CPPCC on Tuesday.

Wan is a deputy to the 11th National Committee of the Chinese People's Political Consultative Conference (CPPCC), China's political advisory body.

"The Olympic village and some of the venues are all the included core areas to implement zero gas exhaust," Wan said as he talked about the high-tech Olympics.

"Over 500 motor vehicles, such as cars and trucks, used in the core areas will be electric ones. Over 4,000 buses using natural gas will also be used during the Games," said Wan.

The venues have also adopted advanced technology to save energy and reduce waste in a bid to keep the Olympic venues clean and environmentally friendly.