BEIJING, Aug. 2 -- High-emission vehicles would be banned from entering the area encircled by middle ring road in Shanghai since Saturday, according to Shanghai Municipal Government.

    The high-emission vehicles refer to those produced before China's issuance of phase one emission standard for motor vehicles, which is equal to Euro I Emission Standard.

    Some 200,000 vehicles in Shanghai, with high exhaust emission, heavy emission concentration and low emission stability, will be affected.

    Shanghai Municipal Environmental Protection Bureau and Public Security Department have laid out implementation measures, specifying restriction areas, vehicles and application procedure for green pass.

    As is monitored, the vehicle exhaust emission has accounted for 60 percent of the pollution in central areas of Shanghai.

    Xinhua News Agency correspondents reporting from Shanghai.