Sectoral Analysis for Civil Aviation
Emissions from civil aviation accounted for less than 8% of the total local emissions of air pollutants in 2016. From 1997 to 2016, the air traffic movements increased by 145%, while the emissions of NOx increased by 112%.
On the contrary, the emissions of RSP and FSP from civil aviation showed a decreasing trend from 2010 to 2016 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 reduced 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 and hence its emissions were reduced to zero.
The Civil Aviation Department (CAD) has adopted the standards set out at Annex 16 to the Convention on International Civil Aviation, Volume II, 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. Taking advantage of the latest development in satellite navigation technologies, CAD has conducted enhancements of the air route system which enabled shortened travelling distances and more aircraft to fly at optimum and fuel efficient altitudes, thereby achieving fuel savings and a reduction of carbon dioxide emissions.