This inventory report accompanies the annual emission inventory submission of the European Community to the UNECE Convention on Long - Range Transboundary Air Pollution. It presents an overview of air pollutant emission data reported by the EU-27 Member States between the years 1990 to 2006. In particular, the report highlights the significant contribution to air pollution made by the transport sector - this sector is the most significant source of NOx, CO and NMVOCs and the second most important source of particulate emissions (PM10 and PM2.5). Across the EU-27, significant emission reductions have occurred for various air pollutants since 1990 - the reported emissions of nitrogen oxides in 2006 have decreased by more than 35 %, and sulphur dioxide by almost 70 %. The emission reductions have taken place across many of the economic sectors reported by countries.