Updated at 6.35pm: The government has proposed tightening emission standards for newly registered heavy vehicles and motorcycles, an Environmental Protection Department spokesman said on Friday.
He said the under the proposal newly registered heavy vehicles - those weighing more than 3.5 tonnes - would have to conform to Euro IV emission standards.
Euro emission standards are requirements defining acceptable limits for exhaust emissions of new vehicles sold in European Union countries. A heavy vehicle meeting the Euro IV standards emits about 30 per cent less nitrogen oxides and 80 per cent less particulates than an existing Euro III model.
The spokesman said light vehicles, weighing up to 3.5 tonnes, had had to comply with Euro IV emission standards from January.
The proposal is expected to come into effect on October 1.
'It also requires all newly registered motorcycles to comply with Euro III emission standards from January 1, 2007,' he said.
