Annual report of the ICP M&M - 2024 | Umweltbundesamt

The work achieved by CCE and CDM and the national contributions to ongoing activities held since the last
annual TF meeting (March 2023) were presented during the 2024 Annual Meeting of the ICP M&M, in Oslo
(Norway) from Tuesday 23 to Thursday 25 April 2024. This was the 40th TF and 31st CCE meeting.
The presentations and discussions were mainly related to the previously defined main scientific challenges,
grouped under the following items:
- Empirical Critical Loads,
- Steady state modelling, critical limits for simple mass balance models, critical levels for ammonia,
- Update of the harmonized Convention receptor map,
- Dynamic modelling.
The next section of this report summarises the main tasks achieved by CCE and CDM since last ICP M&M
report (published July 2023). Chapter 1 states the publication of the report on “Creation of a harmonized land
cover map as an example for the entire region of the Geneva Air Pollution Convention” achieved by CCE.
Chapters 2 and 3 report on the state of play of the mapping on this new receptor map of the Empirical Critical
Loads for Nitrogen (CLempN) and of the updated Critical Levels for ammonia, respectively. Chapter 4 informs
on the several contributions of the CCE under the umbrella of the ICP M&M to the revision
of the Gothenburg Protocol regarding several parameters which reflect risks for biodiversity through air
pollution: Critical Loads for eutrophication, Critical Loads for acidification, as well as Critical Levels
for ammonia. Chapter 5 is a special focus on the thematic session on surface waters led during the 2024 ICP
M&M Task Force meeting where methods calculating Critical Loads for acidification of freshwater ecosystems
on national and international levels were discussed in the perspective of further work to be led by CCE.
Chapter 6 reports the status of the work on development of dynamic modelling carried out by CDM.
Finally, the last section of this report lists the “Mapping Manual” updates subsequent to the above cited
achievements.