EPNB - Expert Panel on Nitrogen Budgets

The Expert Panel on Nitrogen Budgets (EPNB) provides expert guidance to the Task Force on Reactive Nitrogen in providing mass-consistent information of the fate of nitrogen in the environment. It was initiated at the first meeting of the Task Force in Wageningen, Netherlands, in June 2008 as an ad-hoc expert panel. Between 2008 and 2019, 17 meetings of the EPNB have been organized, many of which coinciding with regular task force meetings. EPNB-18 was held online in October 2021, but at least the co-chairs were able to meet in person in Dessau, Germany.

EPNB prepared the “Guidance Document on National Nitrogen Budgets”. The document was presented and approved at the 31st meeting of the Executive Body of the Convention on Long-Range Transboundary Air Pollution. The document can be downloaded from here. There is also a French and a Russian version available.

The detailed provisions of creating N budgets for seven out of eight pools defined in the GD (and a general overview on definitions and principles) have now been provided by EPNB. These Annexes to the GD are now available for public review. Please download and use the annexes provided as one file here (~7 MB file size). This file version includes all comments received by September 21, 2016, and now also includes the Energy Annex that has been made available in September 2019. A first draft concept has been prepared also for the remaining pool, the „Waste Annex“ that can be made available. Please contact one of the EPNB co-chairs in case you wish to seriously engage in working on this pool.

User feedback has been received, and any user is advised to consider when taking advantage of guidance. Please look into this document.  General information on challenges related to the use of this guidance has been provided here. Additional feedback especially on topics that appear during use of these documents will continue to be highly valued even after full adoption. Please download and fill in the review sheet for your feedback, and send it by e-mail to the EPNB co-chairs (Wilfried Winiwarter, winiwarter(at)iiasa.ac.at, and Markus Geupel, markus.geupel(at)uba.de). With the upcoming inclusion of the Waste Annex and a general harmonization, a complete version will be issued.

We will continue posting constructive suggestions along with the guiding material, before improvements are taken up by EPNB and integrated in updated Annexes.

Further developments of national nitrogen budgets were discussed in Vienna, May 31-June 1, 2022 (with optional online participation), in a meeting held jointly with the Urban-Europe / Chinese NSFC co-funded project UNCNET (focussing on urban N budgets). Minutes of EPNB-19 are available here. See also the agenda below, which allows direct access to most of the presentation slides.

EPNB-19, Vienna

Venue: The Vault Vienna, Schadekgasse 5/6, 1060 Vienna

In combination with the UNCNET stakeholder conference


Day 1, May 31, 2022

9.00 – 12.00 morning session

  • Arrival
  • Welcome
  • Recent advances in national and international nitrogen governance (Mark Sutton)
  • National N-Budget – an Austrian Case Study (Ika Djukic)
  • Urban Nitrogen Cycles – UNCNET results (see www.uncnet.org)
    • The UNCNET concept (Wilfried Winiwarter)
    • Atmospheric transport (LinZhang)
    • Leaching and N effects (Feng Zhou)
    • Urban Agriculture (Xiangwen Fan)
    • Waste and Wastewater (Monika Suchowska-Kisielewicz)
    • Comparing cities, indicators (Katrin Kaltenegger)

Lunch break

13.00 – 15.00 afternoon session

  • Knowledge café with working groups
  • Closing


Day 2, June 1, 2022

9.00 – 12.00 morning session (including break)

Lunch break

13.30 – 16.30 afternoon session (including break)


General Note:


EPNB sends updates on their activities in an e-mail newsletter, in addition to material posted here (see EPNB Newsletter April '21). If you wish to become involved, please contact the co-chairs via e-mail. Information on past and current activities, e.g. the minutes of all previous EPNB meetings are also available from this site.