Sweden has signed the protocols on long-range transboundary air pollutants (LRTAP), and as a consequence of this, emission estimates are to be reported annually to the Economic Commission for Europe (UN ECE), according to EB.AIR/GE.1/2002/7, Draft Guidelines for Estimating and Reporting Emissions Data (UNECE, 2002). Emissions of NMVOC are also reported to UNFCCC according to the Revised 1996 Guidelines for National Greenhouse Gas Inventories (IPCC, 1997) and under the NEC-directive (2001/81/EG). National emissions of NMVOC have been reported extensively in the past, but the data have not always been of an even, known or good enough quality. 

In 2002 SMED, Swedish Methodology for Environmental Data, was given the task by the Swedish EPA to review and recalculate time series of emissions of NMVOC in Sweden, 1988-2001, to be included in the submission of national emissions to EU/NEC, UNECE/LRTAP, EU/MM and UNFCCC in 2003. Emission figures in the submission were, however, reported at a rather aggregated level, and details of the sources included and how the estimates were made were not provided in detail. The purpose of this report is to provide background information on the emissions estimation methodology, emission factors and the origin of the emission factors and activity data used in the estimates. 

The base year for reporting NMVOC, according to the 1991 Geneva Protocol on the Control of Emissions of Volatile Organic Compounds, is 1988 for Sweden, which is the reason for choosing 1988 as the first year in the investigated time series presented in the report.