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

The overall aims of EUSAAR are:

- to integrate measurements of atmospheric aerosol properties performed in a distributed network of 20 high quality European ground-based stations (supersites),

- to contribute to a sustainable and reliable operational service in support of policy issues on air quality, long-range transport of pollutants and climate change,

- to consolidate current observation efforts across Europe to ensure their continuation beyond the frame of the present project through networking and joint research activities.