The OECD Air Transport CO₂ Emissions database includes annual, quarterly, and monthly information on CO₂ emissions related to commercial passenger, freight, and general aviation flights, on both a territory and a residence basis, for 186 countries. These CO₂ emissions are estimated by the OECD, based on a consistent methodology across countries.

OECD database is updated by the end of the first month of each quarter with new data from the previous quarter.