Sectoral Analysis for Civil Aviation
Emissions from civil aviation accounted for less than 7% of the total local emissions of air pollutants in 2015. From 1997 to 2015, the air traffic movements increased by 142%, while the emissions of NOx increased by 79%.
On the contrary, the emissions of RSP and FSP showed a decreasing trend from 2010 to 2015 due to the increased use of fixed ground power and pre-conditioned air systems for aircraft at parking stands of the Hong Kong International Airport (HKIA). Such measures reduce the operation time of onboard fuel combustion auxiliary power generation units (APU), and thereby reduce particulate emissions. Since December 2014, the use of APU at frontal stands was totally banned.
The Civil Aviation Department (CAD) has adopted the standards set out at Annex 16 to the Convention on International Civil Aviation, Volume 2, Part III, Chapter 2 to certify the engines installed on aircraft using the HKIA in order to reduce their emissions. This document specifies the standards for four types of emissions that an aircraft engine has to meet, including NOx and CO. Besides, since October 2009, CAD has introduced new air routes which have shorter travelling distances for aircraft arriving from the west and the north of Hong Kong. Each arrival flight has been able to save up to about 210 kilometres in flight distance or 14 minutes in flight time. Measures have also been taken to replace old aircraft with more fuel efficient models, hence reducing emissions from this sector.