Beijing　Capital　International　Airport　(ZBAA)　is　the　world＇s　second　busiest　airport.　In　this　study,　the　emissions　of　air　pollutants　from　aircraft　and　other　sources　at　ZBAA　in　2015　were　estimated　using　an　improved　method,　which　considered　the　mixing　layer　height　calculated　based　on　aircraft　meteorological　data　relay　(AMDAR),　instead　of　using　the　height　(915　m)　recommended　by　ICAO.　The　yearly　emissions　of　NOx,　CO,　VOCs,　SO2,　and　PM2.5　at　the　airport　were　8.76　x　10(3),　4.43　x　10(3),　5.43　x　10(2),　4.80　x　10(2),　and　1.49　x　10(2)　ton/year,　respectively.　The　spatial-temporal　distribution　of　aircraft　emissions　was　systematically　analyzed　to　understand　the　emission　characteristics　of　aircraft.　The　results　indicated　that　NO　x　was　mainly　emitted　during　the　take-off　and　climb　phases,　accounting　for　20.5%　and　55.5%　of　the　total　emissions.　CO　and　HC　were　mainly　emitted　during　the　taxi　phase,　accounting　for　91.6%　and　92.2%　of　the　total　emissions.　Because　the　mixing　layer　height　was　high　in　summer,　the　emissions　of　aircraft　were　at　the　highest　level　throughout　the　year.　Based　on　the　detailed　emissions　inventory,　four　seasons　simulation　using　WRF-CMAQmodel　was　performed　over　the　domain　surrounding　the　airport.　The　results　indicated　that　the　contribution　to　PM2.5　was　relatively　high　in　winter;　the　average　impact　was　about　1.15　mu　g/m(3)　within　a　radius　of　1　km　around　the　airport.　Meanwhile,　the　near　surroundings　and　southwest　areas　of　the　airport　are　the　most　sensitive　to　PM2.5.　(C)2018　The　Research　Center　for　Eco-Environmental　Sciences,　Chinese　Academy　of　Sciences.　Published　by　Elsevier　B.V.