The NAEI Solvent Use categories that map onto the UNECE category Solvent and Other Product Use are given in Appendix A4. The estimates are based on data on solvent use in the sectors supplied by trade associations and manufacturers. The time series is then estimated on the basis of production statistics of the various products. The methodology is described in Passant et al (1998). The breakdown into speciated categories is based on speciation data collected by Rudd (1995), Passant et al (1998), Jenkin et al (2000).