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 5624 observation plots (as at 2021) 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 561 plots (as at 2020) 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

FORECOMON 2023 - The 10th Forest Ecosystem Monitoring Conference is coming up

This year's Scientific Conference of ICP Forests is coming up: 6th June 2023, 13:00 - 16:30.

The programme includes 11 presentations devided in two sessions:

  • Session 1 - Forest monitoring in the Anthropocene - the results
  • Session 2 - Forest monitoring in the Anthropocene – new approaches and perspectives

For further details and participation link visit the conference website:

Posted by Anne-Katrin Prescher on May 11, 2023 at 13:30

Happy holidays & all the best in the new year

The Chairman of ICP Forests and the team at the Programme Co-ordinating Centre of ICP Forests wish all members and friends of ICP Forests

a happy holiday season and all the best in the new year.

We would like to specifically express again our sincere gratitude to everyone involved in the ICP Forests and especially to the participating countries for their ongoing commitment and co-operation in forest ecosystem monitoring across the UNECE region. Thank you!

Posted by Alexa Michel on December 19, 2022 at 13:30

New Report on Empirical Critical Loads of Nitrogen published

The new report on "Review and revision of empirical critical loads of nitrogen for Europe" by the Coordination Centre for Effects of ICP Modelling and Mapping was published in late autumn. Several scientists and experts of the different ICPs were involved, including colleagues from ICP Forests. It features a 86 pages long chapter on "Effects of nitrogen deposition on forests and other wooded land" and provides updated numbers for empirical critical loads for different forests. Considering the new insights and literature of the last 10 years, several empirical critical loads were downsized, thus, indicating a higher sensitivity to N loads than supposed in the former report of 2011.


Press release from the Coordination Centre for Effects…


Posted by Anne-Katrin Prescher on December 16, 2022 at 13:45

Reminder: Plants Special Issue on "Stress response and ecophysiological indicators of tree vitality" - Deadline 31 Oct 2022

Deadline for submitting manuscripts for the Plants Special Issue on "Advances in Forest Ecophysiology: Stress Response and Ecophysiological Indicators of Tree Vitality" is 31 October 2022.

Guest editor: Nenad Potočić, Chair of the ICP Forests Expert Panel on Crown Condition and Damage Causes

More information:

Posted by Alexa Michel on September 20, 2022 at 12:04

New Biodiversa+ Call on Biodiversity Monitoring - Pre-proposal Deadline 9 Nov 2022

Biodiversa+ is a wide co-funded biodiversity partnership for research on biodiversity, policy and society.

The 2022-2023 Call has a clear acronym: "BiodivMon" open to research proposals on "Improved transnational monitoring of biodiversity and ecosystem change for science and society" covering terrestrial, freshwater and marine environments.

Transnational research projects (3-yrs) will address:

(1) Innovation and harmonisation of methods and tools for the collection and management of biodiversity monitoring data

(2) Addressing knowledge gaps on biodiversity status, dynamics, and trends to reverse biodiversity loss

(3) Making use of available biodiversity monitoring data

General target is: helping to better characterize, understand, report on the state and trends of biodiversity.



Posted by Alexa Michel on September 20, 2022 at 12:00

Widespread visible effects of 2022 drought on forest vegetation

Leaf browning on deciduous broadleaved forest vegetation became visible already in August over several slopes in Ticino (Switzerland) and northern Italy (left), and even on the Mediterranean vegetation along the coast of Tuscany (central Italy) (right). It will be interesting to see the results of the 2022 Level I survey.

Posted by Marco Ferretti on September 19, 2022 at 11:00


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