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The mandate of the Task Force Hemispheric Transport of Air Pollution (TF HTAP)under the Convention on Long-Range Transboundary Air Pollution (CLRTAP) isto improve the scientific understanding of the intercontinental airpollution transport, to quantify impacts on human health, vegetation andclimate, to identify emission mitigation options across the regions of theNorthern Hemisphere, and to guide future policies on these aspects. The harmonization and improvement of regional emission inventories isimperative to obtain consolidated estimates on the formation of global-scaleair pollution. An emissions data set has been constructed using regionalemission grid maps (annual and monthly) for SO2, NOx, CO, NMVOC, NH3, PM10,PM2.5, BC and OC for the years 2008 and 2010, with the purpose of providingconsistent information to global and regional scale modelling efforts. This compilation of different regional gridded inventories – including that of theEnvironmental Protection Agency (EPA) for USA, the EPA and EnvironmentCanada (for Canada), the European Monitoring and Evaluation Programme (EMEP)and Netherlands Organisation for Applied Scientific Research (TNO) forEurope, and the Model Inter-comparison Study for Asia (MICS-Asia III) forChina, India and other Asian countries – was gap-filled with the emissiongrid maps of the Emissions Database for Global Atmospheric Research(EDGARv4.3) for the rest of the world (mainly South America, Africa, Russiaand Oceania). Emissions from seven main categories of human activities(power, industry, residential, agriculture, ground transport, aviation andshipping) were estimated and spatially distributed on a common grid of0.1° × 0.1° longitude-latitude, toyield monthly, global, sector-specific grid maps for each substance and year. The HTAP_v2.2 air pollutant grid maps are considered tocombine latest available regional information within a complete globaldata set. The disaggregation by sectors, high spatial and temporal resolutionand detailed information on the data sources and references used willprovide the user the required transparency. Because HTAP_v2.2contains primarily official and/or widely used regional emission grid maps,it can be recommended as a global baseline emission inventory, which isregionally accepted as a reference and from which different scenariosassessing emission reduction policies at a global scale could start. An analysis of country-specific implied emission factors shows a largedifference between industrialised countries and developing countries foracidifying gaseous air pollutant emissions (SO2 and NOx) from theenergy and industry sectors. This is not observed for the particulate matteremissions (PM10, PM2.5), which show large differences betweencountries in the residential sector instead. The per capita emissions of allworld countries, classified from low to high income, reveal an increase inlevel and in variation for gaseous acidifying pollutants, but not foraerosols. For aerosols, an opposite trend is apparent with higher per capitaemissions of particulate matter for low income countries

HTAP_v2.2: a mosaic of regional and global emission grid maps for 2008 and 2010 to study hemispheric transport of air pollution