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European leaders agreed on December 11, 2020 to reduce the EU’s greenhouse gas emissions by at least 55% below 1990 levels by 2030. This is important commitment all countries made to the 2015 Paris Agreement to strengthen their national climate plans (NDCs) every five years. Although aviation accounts for about three percent of the total emission of harmful gases from human activities, their concentration, especially of carbon monoxide in the limited airspace of an airport, may have an impact on the health of employees directly related to work on the airport apron. The airport authority should have knowledge of the amount of harmful emissions within it, which will allow the implementation of measures leading to their reduction. The article proposes a method to estimate the amount of these emissions from aircraft engines during the take-off and landing cycle (LTO) in the airspace of a medium-sized airport. For the specific airline operating at this airport a method for determining the amount of harmful emissions is also proposed. This knowledge can support the introduction of operational procedures reducing them. Key words: harmful emissions, exhaust gases, aircraft engines