The Unite Nations’ Task Force on Hemispheric Transport of Air Pollution (TF HTAP) is an international scientific cooperative effort to improve the understanding of the intercontinental transport of air pollution across the Northern Hemisphere. TF HTAP was organized in 2005 under the auspices of the UNECE Convention on Long-range Transboundary Air Pollution (LRTAP Convention). The model experiments for HTAP phase 2 have the following objectives: (1) Examine the transport of aerosols, including anthropogenic, dust, and biomass burning, from source regions to downwind regions, (2) assess the emission and transport impacts on regional and global air quality, ecosystems, public health, and climate, and (3) provide information on potential emission mitigation options A detailed description can be found here: File