The World Data Centre for Aerosols (WDCA) is the data repository and archive for microphysical, optical, and chemical properties of atmospheric aerosol of the World Meteorological Organisation's (WMO) Global Atmosphere Watch (GAW) programme. The goal of the Global Atmosphere Watch (GAW) programme is to ensure long-term measurements in order to detect trends in global distributions of chemical constituents in air and the reasons for them. With respect to aerosols, the objective of GAW is to determine the spatio-temporal distribution of aerosol properties related to climate forcing and air quality on multi-decadal time scales and on regional, hemispheric and global spatial scales.
Since the WDCA has moved from the EC Joint Research Centre Institute for Environment and Sustainability (JRC-IES) to the Norwegian Institute for Air Research (NILU) as of 1 January 2010, not all legacy data are moved yet. In the transition period, please access legacy data at the JRC-IES FTP-site at: