The National Inventory Report 2011 (NIR 2011) gives a detailed and comprehensive description of the methodology applied in the Austrian air emissions inventory for the greenhouse gases of the “Kyoto basket” (carbon dioxide, methane, nitrous oxide, HFC, PFC and SF6). With this report, Austria complies with its reporting obligations under the UNFCCC and the Kyoto Protocol by providing transparent and verifiable documentation. It contains sector-specific emissions for the years 1990 to 2009, emission factors, activity data and basic data for emission calculations as well as additional information relevant for reporting under the Kyoto Protocol. Moreover, the NIR 2011 provides documentation of the national inventory system and quality assurance as performed by the accredited inspection body (ISO/IEC 17020) on emission inventories.