The overall goal of Tung Chee-hwa's pollution policy is to reduce emissions of respirable particulates by 60 per cent by the end of 2003 and 80 per cent by the end of 2005, by which time nitrogen dioxide levels should be reduced by 30 per cent. Here are the specific goals: Grant $1.4 billion to owners of taxis, light buses and other diesel vehicles to encourage them to switch to LPG and install devices aimed at cutting pollution by 25 per cent. Progress: Legco has yet to approve the funding because of disputes with the taxi association. Remove diesel vehicles from the roads. Progress: Six hundred taxis have switched to LPG, but there remains a problem with LPG supply. No new diesel taxis have been allowed since January 1. The elimination of taxis older than seven years is due to start in 2003. Step up enforcement against vehicles breaking pollution rules. Progress: Improved checks with dynometers for taxis and minibuses have been instituted. Since the devices were introduced, the failure rate has risen from 15 per cent to 85 per cent. However, heavy diesel trucks are not yet checked by dynometers. Introduce electrical trolley buses. Progress: Under research. Improve rail system. Progress: Between now and 2004, $100 billion will be invested in railway network expansion. Tighten emission rules, in line with Europe. Progress: The stringent Euro Three standard for vehicles goes into effect next year.