1. Bruce Rolstad Denby FAIRMODE 4th Plenary, Norrkjoping Sweden June 2011
Modelling of Nitrogen Dioxide (NO2) for air quality assessment and planning relevant to the European Air Quality Directive : WG1 Guidance document
FAIRMODE
Forum for air quality modelling in Europe
Bruce Rolstad Denby
FAIRMODE 4th Plenary, Norrkjoping Sweden
June 2011

2. Aim of the document
Provide more detailed guidance for NO2 modelling, beyond the ‘Reference guide for modelling’ (EEA TR)
Provide a focal point for an overview of modelling
To provide recommendations for good practise in NO2 modelling
Provide a link to models and the modelling community through the MDS

3. Content 1 Introduction 2 Dispersion modelling 3 Chemistry modelling
4 Emission data and inventories
5 Meteorological data
6 Modelling applications for the AQ Directive
References
Appendix
1: Short description of parameterised “NOX to NO2” chemistry schemes
2: Short description of manuals and tools for calculating emission inventories

4. Contributors Contributor email Institute Comments Emilia Georgieva
JRC ISPRA
Chapter 5, particularly 5.3
Bruce Rolstad Denby
NILU
All chapters
Nagl Christian
Gudrun Stranner
Friedrich Poetscher
Stephan Poupa
UBA
Chapter 4, Emissions, 4.4, 4.5, 4.6 and table. Appendix A2.1
Panagiota Dilara
Chapter 4, Emissions. Some corrections and inclusions.
Jongen Suzanne
VITO
Inclusion of VITO related models. Provided information on MIMOSA 4
Addo van Pul
Joost Wesseling
RIVM
Contributions on NO2 chemistry modelling. Chapter Variety of comments on NL perspectives.
John Stedman
AEA
Comments and additions mostly concerning NO2/NOx emission ratio.
Helge Rørdam Olesen
NERI
Comments in chapters 2 and 3. Detailed description of OML chemistry.
Dietmar Öttl
Ulf Janicke
STMK
Janicke Consulting
Section 2.3 Lagrangian particle modelling.
David Carruthers
Martin Seaton
CERC
Comments and additions to Sections 2.1, 2.2, 2.3, 2.4, 2.5, 3.1, 3.2, 4 and Appendix 1
Linton Corbet
CHMI
Contributions and corrections to Sectors 3.4
Lia Fragkou
John Douros
AUTH
Significant contributions to Chapters 2 and 4 and Source apportionment Chapter 6.3
Niemi Jarkko
HSY
Recommended inclusion of AERMOD and other EPA models
Rafael Borge
Julio Lumbreras
UPM
Comments on Chapter 2 and significant content in Chapter 4
Philip Thunis
Chapter 7.2 Validation of models

5. Some points
Tries to provide real recommendations on NO2 modelling, however, does not recommend individual models
Includes direct links to the Model Documentation System (MDS)
Contains a short overview of parameterised “NOX to NO2” chemistry schemes
Provides overview ’fitness for purpose tables’ for chemistry and dispersion modelling

6. Fitness for purpose - dispersion
Model types and applications
Gaussian models
Lagrangian particle models
Obstacle resolving Eulerian models (CFD/LES)
Terrain resolving Eulerian models (NWF)
Open roads
No obstacles, computationally expensive
Poor resolution
Street canyon
In combination with parameterised wind field model
Computationally expensive
Intensive computationally
Urban scale
Requires homogenous meteorology
Not computationally feasible
Regional scale

7. Fitness for purpose - chemistry
Chemical schemes and applications
Empirical schemes
Photo-stationary and ozone limitting schemes
Distance from source and mixing schemes
Reduced photochemical schemes
Full photochemical schemes
Assessment
Street level
Given sufficient observations
Overestimates NO2 in the presence of ozone
Difficult to apply at this scale. CFD only
Only reduced schemes necessary
Urban scale
Suitable for winter or low hydrocarbons
Regional scale
Missing significant chemistry
Planning
Only if scheme includes ozone and NO2 primary emissions
Sensitivity to ozone and NO2 emissions represented
Only if scheme includes ozone and NO2 primary emissions
Suitable with low light or hydrocarbons

8. Process further This meeting:
volunteers for review
additional comments and contributions welcome from all
Reviews and comments to be submitted to
August 31, 2011
Presentation Harmo14, Kos
October 6, 2011
Final draft to be published as ETC TR
October 31, 2011

9. Review and improvement
Person
Reviewers
Contributions
General: whole document
Ana Isabel Miranda
Helge Rørdam Olesen
Chapter 1: Introduction
Chapter 2: Dispersion
STEFANO GALMARINI
BERTRAND BESSAGNET
Chapter 3: Chemistry
Appendix 1
Chapter 4: Emissions
Appendix 2
Rafael Borge
Julio Lumbreras
Chapter 5: Meteorology
Chapter 6: Applications
Chapter 7: Quality assurance

10. For information and contributions contact
Bruce Rolstad Denby