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EUSAAR (European Supersites for Atmospheric Aerosol Research) is an EU-funded I3 (Integrated Infrastructures Initiatives) project carried out in the FP6 framework of the specific research and technological development gramme "Structuring the European Research Area - Support for Research Infrastructures".

The objective of EUSAAR is the integration of measurements of atmospheric aerosol properties performed in a distributed network of 20 high quality European ground-based stations. This integration contributes to a sustainable reliable operational service in support of policy issues on air quality, long-range transport of pollutants and climate change.

EUSAAR is a 5-year project which started on April 1, 2006 and ended on March 31, 2011.

EUSAAR continues its activities jointly with other existing European observation networks under the new research insfrastructure ACTRIS (Aerosols, Clouds, and Trace gases Research InfraStructure Network), which is funded by the FP7 Capacities specific programme for integrating activities by the European Commission.