In addition to CO2, methane (CH4), nitrous oxide (N2O), fluorocarbons (CFCs, HFCs, SF6, etc.), black carbon, aerosols and tropospheric ozone (O3) contribute significantly to climate forcing. Reducing these emissions is often more cost-effective than reducing CO2  emissions. This leads to an enhanced interest in, and need for significant NCGG-emission reductions. Roadmaps addressing NCGG-reduction measures from policy towards implementation are still missing or incomplete in many countries. Integrated studies at the science-policy interface, that take into account international trends will support the development of efficient NCGG policies and measures. From November 2 to November 4, 2011, the Air Quality and Climate Change Section of the Netherlands Association of Environmental Professionals (VVM) organizes the Sixth International Symposium on science, implementation and policy aspects of non-CO2 greenhouse gases (NCGG-6). NCGG-6 will be held in Amsterdam in The Netherlands and will address both the role of non-CO2 greenhouse gases and aerosol in human-induced climate forcing and options for reduction in industry and society. The symposium aims to remove barriers between policy, industry and science and fosters the dialogue between scientists, engineers and officials in industry and government working in this field from different perspectives. This multidisciplinary approach is expected to yield realistic and achievable mitigation solutions that significantly lower NCGG emissions.  The conference welcomes papers on the following themes: Theme 1. Sources, Sinks and InventoriesTheme 2. Atmospheric ProcessesTheme 3. Policy Implementation: Mitigation and Adaptation