Summary: Antonio Da Roza, Jessica Hefes

Originally reported: SCMP

Date: 6/2/10

Originally: 3/11/07

What are the benefits of banning idling engines? [1]/font></p> Scientists and engineers at HKUST and Polytechnic University have questioned the extent to which the Government’s proposal to ban idling vehicle engines will reduce air pollution, saying more data is needed to justify the initiative. It was estimated by the mechanical engineering department at Polytechnic University that pollutant emissions in busy districts could drop by 10% if such a ban was in force. Idling public light buses emit half the pollutants of one in motion, whilst cars emit almost as much idling as in motion. However, according to the Hong Kong Institute of Vocational Education, engines must be switched off for 3 minutes before there is an effective reduction. Switching engines on and off would wear starter motors out more quickly, said the Motor Transport Workers General Union, who oppose the proposal.


  1. Benefits Of Idling Ban Unclear, SCMP, 03/11/07