Concentration Values of PM _2.5 and PM ₁₀ Measured in Selected Locations at an Airport and Propagation Models for NO _x and CO Emitted during Take-Off and Landing of Airplanes

European leaders agreed on 11 December 2020 to reduce the EU’s greenhouse gas emissions by at least 55% below 1990’s levels by 2030. Although the aviation industry accounts for about 3% of the total emissions of harmful gases produced by mankind, their concentration in the limited airspace of an airport may have an impact on the surroundings. This means that in addition to knowledge about the level of greenhouse gas (GHG) emissions, it is important to have data about the emitted amounts, propagation, and concentrations of harmful gases like CO and NO_x as well as of particulate matter PM_2.5 and PM₁₀. This is particularly true over an airport, where it may afect the health of employees working directly on the apron. The airport authority should be aware of the actual amounts and concentrations of harmful emissions within the airport space, making it possible take measures leading to their reduction. Moreover, knowledge of the directions of propagation and concentration of harmful components of aircraft engine exhaust gases may be helpful during the process of designing new airports. This article presents the results of PM_2.5 and PM₁₀ measurements taken at selected points of the airport in Warsaw, Poland. Also presented is a model of the propagation of emissions from the engines of aircraft operated at the airport, developed using special software.