Sectoral Analysis for Road Transport
Road transport was a major emission source of NOx, VOC and CO, accounting for 18%, 18% and 51% of the total emissions in 2015, respectively. Overall, the emissions from road transport decreased by 58% to 99% from 1997 to 2015, despite an increase in vehicle-kilometer-travelled of 15% during the same period.
The substantial decreases in NOx, RSP, FSP, VOC and CO emissions from 2010 to 2015 could be attributed to an array of vehicle emission control programmes, which included the tightening of vehicle emission standards from Euro IV to Euro V in 2012, providing a one-off subsidy to vehicle owners for the replacement of the catalytic convertors and oxygen sensors of petrol / liquefied petroleum gas (LPG) taxis and light buses, strengthening the emissions control for LPG and petrol vehicles by deploying roadside remote sensing equipment to detect excessive emissions from petrol and LPG vehicles and launching an incentive-cum-regulatory scheme to progressively phase out some 82 000 pre-Euro IV diesel commercial vehicles by end 2019. By the end of 2015, 47% of the pre-Euro IV diesel commercial vehicles had already been phased out.
As for SO2, the vehicle emissions stayed at a very low level in the past few years because of the introduction of Euro V diesel in December 2007, which has the sulphur content capped at 0.001%.