The goal of this research was to quantify emissions of carbon dioxide (CO2), nitrogen oxides (NO_x), particle number, and black carbon (BC) from in-use aircraft and related activity at a regional airport. Pollutant concentrations were measured adjacent to the airfield and passenger terminal at the Roanoke Regional Airport in Virginia. Observed NO_x emission indices (Els) for jet-powered, commuter aircraft were generally lower than those contained in the International Civil Aviation Organization databank for both taxi (same as idle) and takeoff engine settings. NO_x Els ranged from 1.9 to 3.7 g (kg fuel)~(-1) across five types of aircraft during taxiing, whereas Els were consistently higher, 8.8—20.6 . g (kg fuel)~(-1), during takeoff. Particle number Els ranged from 1.4 × 10~(16)to 7.1 × 10~(16) (kg fuel)~(-1) and were slightly higher in taxi mode than in takeoff mode for four of the five types of aircraft. Diurnal patterns in CO2 and NO_x. concentrations were influenced mainly by atmospheric conditions, while patterns in particle number concentrations were attributable mainly to patterns in aircraft activity. CO2 and NO_x fluxes measured by eddy covariance were higher at the terminal than at the airfield and were lower than found in urban areas.
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