Sectoral Analysis for Road Transport
Road transport was a major emission source of NOx, VOC and CO, accounting for 18%, 18% and 54% of the total emissions in 2016, respectively. Overall, the emissions from road transport decreased by 54% to 99% from 1997 to 2016, despite an increase in vehicle-kilometer-travelled of 18% during the same period.
The substantial decreases in NOx, RSP, FSP, VOC and CO emissions from 2010 to 2016 could be attributed to a series 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 petrol and LPG vehicles by deploying roadside remote sensing equipment to detect excessive emissions from petrol and LPG vehicles; retrofitting Euro II and Euro III franchised buses with selective catalytic reduction devices to upgrade their emission performance; and launching an incentive-cum-regulatory scheme to progressively phase out some 82 000 pre-Euro IV diesel commercial vehicles by end 2019.
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%.