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Latest update : Mapping Manual

The version of chapter 5 of the Mapping manual, which was adopted by the Working Group on Effect at the 2nd joint session of the EMEP Steering Body and the Working Group on Effects (Geneva, 13-16 September 2016) is now available

Manual on Methodologies and Criteria for Modelling and Mapping Critical Loads and Levels and Air Pollution Effects, Risks and Trends.

This manual describes methods for calculating critical loads and levels, as well as for dynamic modelling to be used by National Focal Centres (NFCs) of the LRTAP Convention. It provides harmonised indicators to assess the impacts of acidification, eutrophication, ozone and particulate matter on terrestrial and aquatic ecosystems, crops or building materials. These indicators result from 35 years of scientific research, in close collaboration with policy makers to answer the needs of policy development and implementations.

The Chapters of the Mapping Manual can be downloaded from this page right column.

Updates of the Mapping Manual

The First Mapping Manual was published in 1993. In order to keep up with new scientific findings, the Mapping Manual has been updated in 1996 and 2004 and again in 2016, following an invitation to ICP M&M by the WGE in September 2013 (document ECE/EB.AIR/WG.1/2013/2). This last update was lead by the ICP M&M chair with the contributions of the CCE and NIVA for Chapters 1, 2 and 5 to 8. Chapter 3 was updated and reviewed by ICP Vegetation and its Task Force, while Chapter 4 was updated and reviewed by ICP Materials and its Task Forces. Chapter 5 is still currently under review. This update has been funded by Germany and France.

In the future, each chapter will be updated independently to reflect new scientific knowledge.

Each chapter is to be quoted as: “ CLRTAP, 2014. Guidance on mapping concentrations levels and deposition levels, Chapter [chapter number] of Manual on methodologies and criteria for modelling and mapping critical loads and levels and air pollution effects, risks and trends. UNECE Convention on Long-range Transboundary Air Pollution; accessed on [date of consultation] at www.icpmapping.org”. 

2004 Mapping Manual


CLRTAP, 2004. Manual on Methodologies and Criteria for Modelling and Mapping Critical Loads and Levels and Air Pollution Effects, Risks and Trends. Umwelbundesamt, Berlin.

Mapping Manual  

Mapping Manual in English (25 MB,pdf)

Mapping Manual in Russian (25 MB,pdf)

Individually downloadable Chapters:

Some updates of the Manual were carried out between 2004 and 2016 and are available from the links below.

Chapter 1 - Introduction
Chapter 2 - Guidance on Mapping Concentration Levels and Deposition Loads
Chapter 3 - Mapping Critical Levels for Vegetation (June.2011)
Chapter 4 - Mapping of Effects on Materials (03.01.05)
Chapter 5.1 - Introduction
Chapter 5.2 - Empirical Critical Loads (12.11.07) NOTE:
for the latest info see the report on revision of empirical critical loads
Chapter 5.3 - Modelling Critical Loads for Terrestrial Ecosystems (12.11.07)
Chapter 5.4 - Critical Loads for Aquatic Ecosystems (03.01.05)
Chapter 5.5 - Critical Loads of Heavy Metals Annex I - III (12.01.09)
Chapter 6 - Dynamic modelling
Chapter 7 - Exceedance calculation
Chapter 8 - General mapping issue


Historical development of the Mapping Manual:

The Mapping Manual is the product of several refinements of critical loads and levels approaches that can be followed by consulting the background material listed below:

a) 1989 Report of the Initial ECE Mapping Workshop, Bad Harzburg, Gerrmany.

b) UBA, 1990, Draft Manual on Methodologies and Criteria for Mapping Critical Loads/Levels with scientific Annexes I to IV,Federal Environmental Agency, Berlin, Germany.

c) Mapping Vademecum 1992, available at the Coordination Centre for Effects, Bilthoven, The Netherlands, RIVM Report No. 259101002.

d) UBA, 1993,Manual on Methodologies and Criteria for Mapping Critical Loads/Levels (First Edition); Texte Umweltbundesamt 25/93, Federal Environmental Agency (ed), Berlin, Germany.

e) UBA, 1996. Manual on Methodologies and Criteria for Mapping Critical Levels / Loads and geographical areas where they are exceeded. Texte Umwelbundesamt 71/96 Federal Environmental Agency (ed), Berlin, Germany, 204 pp.

last update 1 February 2017