Welcome to ICP Forests

A programme aiming at a comprehensive compilation of information on the condition of forests in Europe and beyond

The International Co-operative Programme on Assessment and Monitoring of Air Pollution Effects on Forests (ICP Forests) was launched in 1985 under the Convention on Long-range Transboundary Air Pollution (Air Convention, formerly CLRTAP) of the United Nations Economic Commission for Europe (UNECE).

ICP Forests monitors forest condition at two monitoring intensity levels:

The Level I monitoring is based on 5706 observation plots (as at 2023) on a systematic transnational grid of 16 x 16 km throughout Europe and beyond to gain insight into the geographic and temporal variations in forest condition.

The Level II intensive monitoring comprises 640 plots (as at 2022) in selected forest ecosystems with the aim to clarify cause-effect relationships.

At present 42 countries in Europe and beyond participate in ICP Forests. All data are available upon request.

Blog Posts

ICP Forests members shared their knowledge at the 26th IUFRO World Congress

At the IUFRO in Stockholm, some ICP Forests members presented their research and thus contributed to the international discourse on forests and society towards 2050.

Among others, ICP Forests chaired a thematic session with eight oral and nine poster presentations on trends and implications of nitrogen deposition on forest ecosystem services in a changing climate. The session included presentations focusing on the overall spatial and temporal trends (mainly across Europe) as well as presentations in which researchers focused on specific case studies.

In the oral session, Dr. Arne Verstraeten showed, with the exception of a limited number of plots, a steady but slow decline of the nitrogen deposition across the ICP Forests Level II network in Europe. Dr. Peter Waldner compared the critical limits for nitrate leaching and soil…


Posted by Michelle Dörner on July 9, 2024 at 13:07

ICP Forests events at IUFRO World Congress 2024, Stockholm

If you attend the IUFRO World Congress in Stockholm next week, we would like to invite you to:

(1) Tuesday, 25 June, 18:15 (CEST): ICP Forests group photo: Please meet on Tuesday, 25 June, at 18:15 in front of Victoria Hall.

(2) Thursday, June 27, 16:00 - 18:00 (CEST: ICP Forests session on "Nitrogen Depositions in a changing climate: Trends and Implications on Forest Ecosystem Services" T1.23 

(3) Friday, June 28, 12:30 - 13:15 (CEST), Poster Stand 8: ICP Forests poster session on "Nitrogen Depositions in a changing climate: Trends and Implications on Forest Ecosystem Services" [Poster session 1] - T1.23

(4) Friday, June 28, 13:30 - 14:20 (CEST): Short presentation by Marco Ferretti on "The new age of forest monitoring: A common European forest monitoring…


Posted by Alexa Michel on June 21, 2024 at 15:00

40 years of ICP Forests will be celebrated in Dresden, Germany

Next year, ICP Forests celebrates its 40th anniversary. The PCC is pleased to announce that the Anniversary FORECOMON Conference as well as the Task Force Meeting will be held in Dresden, Germany, 19-23 May, 2025.

The motto of the FORECOMON will be “On the pulse of European Forests: 40 years of forest monitoring – from air pollution to climate change”. As part of the conference, there will be an excursion to the Ore Mountains.

We are happy to welcome researchers, experts and politicians to Dresden next year!

More information will follow.

Photo: Michelle Dörner

Posted by Michelle Dörner on June 19, 2024 at 13:30

11th International Forest Ecosystem Monitoring Conference FORECOMON in Prague was a huge success

Last week, the FORECOMON Conference was successfully held in Prague, Czechia. The conference motto was “Monitoring for future forests”.  

On Tuesday, June 11, the participants discussed research results on the influence of air pollution and extreme weather events on long-term processes in forest ecosystems. The knowledge exchange about new monitoring approaches to support resilient forests was also on the agenda.

On Wednesday, 12 June, the focus of the FORECOMON was on an issue that has affected many forest areas in Europe suffering from drough under climate change: bark beetles. Among other things, the participants visited recent extensive clearings caused by bark beetle infestations in the area of the Bohemian-Moravian Highlands and learnt about the methods applied by local foresters in cooperation with the Forestry and Game Management Research Institute for timely reforestation.…


Posted by Michelle Dörner on June 17, 2024 at 13:31


June 23, 2024 to June 29, 2024 – Stockholm, Sweden

The IUFRO WORLD CONGRESS, one of the largest global forest events, will take place in Stockholm in June under the theme Forests and Society Towards 2050. The congress is organized by The Swedish University of Agricultural Sciences and the City of Stockholm in close collaboration with the Nordic and Baltic partners.

We are pleased that some of the ICP Forests members will participate with presentations and posters and also chair a session on “Nitrogen deposition in a changing climate: Trends and Implications on Forest Ecosystem Services”.

  • When? – June 27, 2024 // 4-6pm
  • Where? – Room 3

The session will be chaired by our colleagues Nathalie Cools (INBO), Arne…


Posted by Michelle Dörner on April 11, 2024 at 11:33

Joint comment on current proposal from EU Commission for new forest monitoring framework

Several researchers associated with ICP Forests were examining the extent to which the current draft of the EU forest monitoring proposal is in line with its intended objectives to support forest resilience under climate change in European forests. They stated that the EC proposal lacks the integration of some crucial and already existing resources and infrastructures and they then provide suggestions to help reconciling the proposal with its objectives and a more comprehensive monitoring vision.


For details, please refer to: Ferretti et al. (2024) Resilient forests need joint forces for better inventorying and monitoring. Forest Ecology and Management (https://doi.org/10.1016/j.foreco.2024.121875)


Posted by Michelle Dörner on April 10, 2024 at 11:48


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