Regional estimates are presented by industry and household for four gases - carbon dioxide, methane, nitrous oxide, and F-gases. The F-gases constitute of hydrofluorocarbons, perfluorocarbons, sulfur hexafluoride and nitrogen trifluoride.Emissions are presented in Million metric tons of CO₂ equivalent (MTCO2e).Sources:  Organisation for Economic Co-operation and Development (2022), Air Emission Accounts, OECD.Stat https://stats.oecd.org/Index.aspx?DataSetCode=AEA; Organisation for Economic Co-operation and Development (2022), Air Emission Accounts – OECD Estimates, OECD.Stat https://stats.oecd.org/Index.aspx?DataSetCode=OECD-AEA; Organisation for Economic Co-operation and Development (2022), Quarterly National Accounts, OECD.Stat https://stats.oecd.org/Index.aspx?DataSetCode=QNA%20; United Nations Framework Convention on Climate Change (UNFCCC). 2022. Greenhouse Gas Inventory Data - Detailed data by Party - Annex I. https://di.unfccc.int/detailed_data_by_party. Copyright 2022 United Nations Framework Convention on Climate Change; Crippa, M., Guizzardi, D., Solazzo, E., Muntean, M., Schaaf, E., Monforti-Ferrario, F., Banja, M., Olivier, J., Grassi, G., Rossi, S. and Vignati, E., GHG emissions of all world countries, EUR 30831 EN, Publications Office of the European Union, Luxembourg, 2021, ISBN 978-92-76-41547-3, doi:10.2760/074804, JRC126363; IEA (2022) Monthly electricity data, www.iea.org/statistics, All rights reserved; as modified by IMF;  IEA (2022) Monthly oil statistics, www.iea.org/statistics, All rights reserved; as modified by IMF;  IEA (2022) Monthly gas statistics, www.iea.org/statistics, All rights reserved; as modified by IMF;  Country Authorities; IMF staff calculations.Category: Greenhouse Gas (GHG) EmissionsData series: Quarterly greenhouse gas (GHG) air emissions accountsMetadata:Quarterly greenhouse gas air emissions from production and household consumption are adjusted for seasonality. SEEA Air Emissions Accounts from official country sources have been accessed via the OECD Air Emissions Accounts database.Methodology:The OECD Air Emission Accounts database presents estimates that align with the classifications, concepts and methods consistent with the System of Environmental-Economic Accounting Central Framework (SEEA-CF). In addition to the OECD database, the estimation procedure uses the emission inventories sourced from UNFCCC, EDGAR and CAIT. Correspondence tables and industry output shares are used to concord the UNFCCC, EDGAR and CAIT estimates to their corresponding industrial and household activities. Annual estimates of greenhouse gas emissions by industry and for households are trended forward using the latest emission data available. They are temporally disaggregated using the best temporal aggregation method in conjunction with seasonally adjusted sub-annual indicators of economic activity highly correlated with the annual estimates, under a prior assumption on linkages with the annual estimates.Quarterly estimates for the most recent period (for which annual estimates do not exist) are extrapolated using the timelier sub-annual indicators.Disclaimer:The estimates are considered experimental. The sources and methods used to compile these estimates are still in development. Users are encouraged to examine the documentation, metadata, and sources associated with the data. User feedback on the fit-for-use of this product and whether the various dimensions of the product are appropriate is welcome.