The database provides measures of CO2 emissions on a residence basis, which is used to estimate the emissions of air transport (H51 in the International Standard Industrial Classification of All Economic Activities, or ISIC) in the Air Emission Accounts (AEAs). The emissions are estimated for 186 countries by the OECD, based on a consistent methodology across countries.
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COâ‚‚ emissions from air transportation in select countries 2024, by flight type
The United States was the world's biggest contributor to air transportation emissions in 2024. That year, passenger and freight flights in the North American country were responsible for an estimated around *** million metric tons of carbon dioxide (MtCO₂), ** percent of which came from domestic flights. China and the United Kingdom followed with emissions totaling *** and ** MtCO₂, respectively. While domestic emissions were also the largest source of China's aviation emissions that year, international flights made up roughly ** percent of the UK's emissions. Globally, international flights account for around ** percent of total air transportation CO₂ emissions.
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OECD. (July 14, 2025). Carbon dioxide emissions of passenger and freight flights in selected countries worldwide in 2024, by flight type (in million metric tons) [Graph]. In ÌÇÐÄÆƽâ°æ. Retrieved August 01, 2026, from /statistics/1534874/co2-emissions-domestic-international-flights-by-country/
OECD. "Carbon dioxide emissions of passenger and freight flights in selected countries worldwide in 2024, by flight type (in million metric tons)." Chart. July 14, 2025. ÌÇÐÄÆƽâ°æ. Accessed August 01, 2026. /statistics/1534874/co2-emissions-domestic-international-flights-by-country/
OECD. (2025). Carbon dioxide emissions of passenger and freight flights in selected countries worldwide in 2024, by flight type (in million metric tons). ÌÇÐÄÆƽâ°æ. ÌÇÐÄÆƽâ°æ Inc.. Accessed: August 01, 2026. /statistics/1534874/co2-emissions-domestic-international-flights-by-country/
OECD. "Carbon Dioxide Emissions of Passenger and Freight Flights in Selected Countries Worldwide in 2024, by Flight Type (in Million Metric Tons)." ÌÇÐÄÆƽâ°æ, ÌÇÐÄÆƽâ°æ Inc., 14 Jul 2025, /statistics/1534874/co2-emissions-domestic-international-flights-by-country/
OECD, Carbon dioxide emissions of passenger and freight flights in selected countries worldwide in 2024, by flight type (in million metric tons) ÌÇÐÄÆƽâ°æ, /statistics/1534874/co2-emissions-domestic-international-flights-by-country/ (last visited August 01, 2026)
Carbon dioxide emissions of passenger and freight flights in selected countries worldwide in 2024, by flight type (in million metric tons) [Graph], OECD, July 14, 2025. [Online]. Available: /statistics/1534874/co2-emissions-domestic-international-flights-by-country/
