On the local front , on january 1 , we introduced euro iv petrol standards for our vehicles , and in august , we introduced a new policy of imposing emissions caps in the specified process licences for power plants . we also completed a programme of retrofitting about 36 600 heavy diesel vehicles with emission reduction devices as well as another programme which provided incentives to owners to replace 2 521 diesel light buses with lpg light buses 在本港方面，我们于2005年1月1日实施欧盟四期车用汽油规格，其后并于8月推行新政策，在发电厂的指明工序牌照订明排放上限，另亦完成重型柴油车辆改装计划，促使本港约36 600辆重型车辆安装废气消减装置以及推行另一套计划，向2 521辆柴油公共小巴的车主提供经济诱因，鼓励他们改用石油气小巴。
