The calculation method of aviation emissions based on time spent in various modes in LTO cycles was improved. The effective emission height was calculated based on AMDAR data, instead of using the height (915m) proposed by ICAO. Then, the total amount of atmospheric pollutant emissions from aviation was estimated accurately. The total emissions of NOx, CO, HC, SO2 and PM2.5 from aviation in Beijing Capital International Airport (BCIA) were about 7042.1, 3189.9, 295.3, 429.4 and 150.4t, respectively. As compared with the traditional method based on LTO cycles, the result estimated with the improved method revealed that emissions of NOx, CO, HC and SO2 had increased by 23.5%, 2.3%, 2.1% and 18.1%, severally. Monthly emissions of CO, HC, SO2 and PM2.5 from aircraft in BCIA presented a relatively steady trend, but NOx was fluctuated on a large scale. Emissions from aviation were lower in January to February; and monthly emission was peaked in August. Moreover, as for different operation modes, the climbing and taxiing course were found with the largest emission. Approximately 37.7% and 36.8% of the total aircraft emissions were produced in climbing and taxiing, respectively.
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