Matthias Ketzel PhD, Senior Scientist National Environmental Research Institute University of Aarhus Frederiksborgvej 399, P. O. Box 358 DK-4000 Roskilde, Denmark Phone: +45 4630 1171 Fax: +45 4630 1214 mke@dmu.dk

Content of this page: Research/Photos, Short CV, Publications, Links
An alternativ personal pages containing an inter acive publication list exists at AU.dk

• Main contact for (Win)OSPM after retirement of Ruwim Berkowicz
• Member of the International Scientific and Advisory Committee of the Conference on Air Quality - Science and Application (formerly Urban Air Quality Conference)
• Member of the Evaluation Panel for the European Green Capital Award 2010&2011
• Chair of local organisation committee for NOSA 2007 conference
• Research topics: Atmospheric aerosols, Modelling of aerosol dynamics: Model MAT, Dispersion modelling at local and urban scale: Models MISKAM, OSPM, OML-Multi and UBM, Vehicle emission factors
• PhD project: Size distribution and composition of particulate matter near roads.

Super visors: Erik Swietlicki (Lund University); Ruwim Berkowicz (NERI) and Ole John Nielsen (Copenhagen University)
PhD thesis: Dispersion and Transformation of Traffic Exhaust Particles in the Urban Atmosphere. Public defence: May 28, 2004, Lund University.
Licentiate thesis: Experimental and modelling studies of particle and gaseous pollutants in urban street environments. Public defence: January 17, 2003, Lund University.

With Ruwim and Elisabetta at Roskilde Fjord near NERI.	After Graduation in front of Lund University with family.
Vavihill, Southern Sweden with Adam Kristensson. Visiting the rural field station operated by Lund University.	Jagtvej, Copenhagen. Installation of an automatic video traffic sensor near our monitoring station (lower left corner):

• Kumar, P., Garmory, A., Ketzel, M., Berkowicz, R. and Britter, R. (2009): Comparative study of measured and modelled number concentrations of nanoparticles in an urban street canyon. Atmospheric Environment 43, 949-958.(doi-Link)
• Olesen, H. R., Berkowicz, R., Ketzel, M. and Lofstrom, P. (2009): Validation of Oml, Aermod/Prime and Miskam Using the Thompson Wind-Tunnel Dataset for Simple Stack-Building Configurations. Boundary-Layer Meteorology 131, 73-83.(doi-Link)
• Löndahl, J., Massling, A., Swietlicki, E., Brauner, E. V., Ketzel, M., Pagels, J. and Loft, S. (2009): Experimentally Determined Human Respiratory Tract Deposition of Airborne Particles at a Busy Street. Environmental Science & Technology 43, 4659-4664.(doi-Link)
• Jensen, S.S., M. Ketzel, R. Berkowicz, M. Hvidberg, J. Høj (2009): Cleaner transport technology most efficient to ensure compliance with 2010 NO2 limit values in Copenhagen, Denmark. International Journal of Environment and Waste Management. 4, 179-196.(doi-Link)
• Berkowicz, R., Ketzel, M., Jensen, S.S., Hvidberg, M. & Raaschou-Nielsen, O. (2008): Evaluation and application of OSPM for traffic pollution assessment for a large number of street locations. Journal of Environmental Modelling and Software 23: 296-303. (doi-Link)
• Andersen, Z.J., S. Loft, M. Ketzel, M. Stage, T. Scheike, M. N. Hermansen & H. Bisgaard (2008): Ambient air pollution triggers wheezing symptoms in infants. Thorax
63: 710-716. (doi-Link)
• Hertel, O., Hvidberg, M., Ketzel, M., Storm, L. & Stausgaard, L. (2008): A proper choice of route significantly reduces air pollution exposure — A study on bicycle and bus trips in urban streets. Science of The Total Environment 389: 58-70. (doi-Link)
• Glasius ,M., M. Ketzel, P. Wåhlin, R. Bossi, J. Stubkjær, O. Hertel & F. Palmgren (2008): Characterization of particles from residential wood combustion and modelling of spatial variation in a low-strength emission area. Atmospheric Environment 42: 8686-8697. (doi-Link)
• Andersen, Z.J., P. Wahlin. O. Raaschou-Nielsen, M. Ketzel, T. Scheike & S. Loft (2008): Size Distribution and Total Number Concentration of Ultrafine and Accumulation Mode Particles and Hospital Admissions in Children and Elderly in Copenhagen. Occupational and Environmental Medicine. 65: 458–466. (doi-Link)
• Pohjola, M.A., L. Pirjola, A. Karppinen, J. Härkönen, H. Korhonen, T. Hussein, M. Ketzel & J. Kukkonen (2007): Evaluation and modelling of the size fractionated aerosol particle number concentration measurements nearby a major road in Helsinki – Part I: Modelling results within the LIPIKA project. Atmospheric Chemistry and Physics 7: 4065-4080.(ACP-Link)
• Hertel, O., Ellermann, T., Palmgren, F., Berkowicz, R., Løfstrøm, P., Frohn, L.F., Geels, C., Skjøth, C.A., Brandt, J., Christensen, J., Kemp, K. & Ketzel, M. (2007): Integrated Air Quality Monitoring - Combined use of measurements and models in monitoring programmes. Environmental Chemistry 4: 65-74. (doi-Link)
• Ketzel, M., G. Omstedt, C. Johansson, I. Düring, M. Pohjola, D. Oettl, L. Gidhagen, P. Wåhlin, A. Lohmeyer & R. Berkowicz (2007): Estimation and validation of PM_2.5/PM₁₀ exhaust and non-exhaust emission factors for practical street pollution modelling, Atmospheric Environment 41: 9370–9385. (doi-Link)
• Glasius, M., Ketzel, M., Wåhlin, P., Jensen, B., Mønster, J.G., Berkowicz, R. & Palmgren, F. (2006): Impact of wood combustion on particle levels in a residential area in Denmark. Atmospheric Environment 40: 7115-7124. (doi-Link)
• Boffi, R., A. Ruprecht, R. Mazza, M. Ketzel and G. Invernizzi (2006): A day at the European Respiratory Society Congress: passive smoking influences both outdoor and indoor air quality. European Respiratory J. 27, 862-863. (doi-Link)
• Berkowicz, R., Winter, M. and Ketzel, M. (2006): Traffic pollution modelling and emission data. Environmental Modelling & Software 21, 454-460. (doi-Link)
• Löndahl, Jakob, Joakim Pagels, Erik Swietlicki, Jingchuan Zhou, Matthias Ketzel, Andreas Massling and Mats Bohgard (2006): A set-up for field studies of respiratory tract deposition of fine and ultrafine particles in humans. Journal of Aerosol Science 37, 1152-1163. (doi-Link)
• Rose, D., B. Wehner, M. Ketzel, C. Engler, J. Voigtländer, T. Tuch and A. Wiedensohler (2006): Atmospheric number size distributions of soot particles and estimation of emission factors . Atmos. Chem. Phys. 6, 1021-1031. (ACP-Link)
• Ketzel, M. and Berkowicz, R. (2005): Multi-plume aerosol dynamics and transport model for urban scale particle pollution. Atmospheric Environment 39, 3407-3420. (doi-Link)
• Ketzel, M. and Berkowicz, R. (2004): Modelling the fate of ultrafine particles from exhaust pipe to rural background: an analysis of time scales for dilution, coagulation and deposition. Atmospheric Environment 38, 2639-2652. (doi-Link)
• Ketzel, M., Wåhlin, P., Kristensson, A., Swietlicki, E., Berkowicz, R., Nielsen, O. J., and Palmgren, F. (2004): Particle size distribution and particle mass measurements at urban, near-city and rural level in the Copenhagen area and Southern Sweden. Atmos. Chem. Phys. 4, 281-292. (ACP-Link)
• Wåhlin, P., Ketzel, M. & Palmgren, F. 2004: Dependence on meteorological conditions of traffic particle profíles measured in a street canyon in Copenhagen. In: Raunemaa, T., Yli-Pirilä, P. & Kajander, A. (eds): 1st International Symposium on Incomplete Combustion, November 9-11, 2003, Kuopio, Finland. Kuopio University. - Kuopio University Publications C. Natural and Environmental Sciences 172: 142-145.
• Ketzel M., P. Wåhlin, R. Berkowicz and F. Palmgren (2003): Particle and trace gas emission factors under urban driving conditions in Copenhagen based on street and roof level observations. Atmospheric Environment 37, 2735-2749. (doi-Link)
• Kastner-Klein, P., Fedorovich, E., Ketzel, M., Berkowicz, R., and Britter, R. (2002): The modelling of turbulence from traffic in urban dispersion models - Part II: Evaluation against laboratory and full-scale concentration measurements in street canyons. Environmental Fluid Dynamics 3, 145-172. (doi-Link)
• Ketzel M., P. Louka, P. Sahm, J.-F. Sini, E. Guilloteau and N. Moussiopoulos (2002): Intercomparison of numerical urban dispersion models - Part II: Street canyon in Hannover, Germany. Water, Air and Soil Pollution: Focus 2, 603-613. (doi-Link)
• Sahm P., P. Louka, M. Ketzel, E. Guilloteau and J-F. Sini (2002): Intercomparison of numerical urban dispersion models - Part I: Street canyon and single building configurations. Water, Air and Soil Pollution: Focus 2 (5-6), 587-601. (doi-Link)
• Berkowicz R., M. Ketzel, G. Vachon, P. Louka, J-M. Rosant, P.G. Mestayer and J-F. Sini (2002): Examination of Traffic Pollution Distribution in a Street Canyon Using the Nantes'99 Experimental Data and Comparison with Model Results. Water, Air and Soil Pollution: Focus 2 (5-6), 311-324. (doi-Link)
• Le Bihan O., P. Wåhlin, M. Ketzel, F. Palmgren and R. Berkowicz (2002): Application of Dispersion Modelling for Analysis of Particle Pollution Sources in a Street Canyon. Water, Air and Soil Pollution: Focus 2 (5-6), 395-404. (doi-Link)
• Ketzel, M., Berkowicz, R., Müller, W.J. and Lohmeyer, A. (2002): Dependence of street canyon concentrations on above roof wind speed - implications for numerical modelling. International Journal of Environment and Pollution 17, 356-366. (Journal-Link)
• Clai, G., Berkowicz, R., Düring, I, Ketzel, M., Lohmeyer, A., Moussiopoulos, N. and Papalexiou, S. (2001): Proposal for the calculation of the high percentiles of NO₂ concentrations, necessary for the execution of EU Directive 1999/30/EC. International Journal of Environment and Pollution 16, 451-459. (Journal-Link)
• Ketzel, M., Berkowicz, R. and Lohmeyer, A. (2000): Comparison of Numerical Street Dispersion Models with Results from Wind Tunnel and Field Measurements. Environmental Monitoring and Assessment, Volume 65, Issue 1/2, pp. 363-370.(doi-Link)
• Lohmeyer, A., Bächlin, W. and Ketzel, M. (2000): The Draft of the New German Guideline VDI 3782/8 to Model Automobile Exhaust Dispersion. Environmental Monitoring and Assessment, Volume 65, Issue 1/2, pp. 381-387. (doi-Link)
• Ketzel, M., Haase, M. and Lohmeyer, A. (1999): Numerische Modellierung der Radonausbreitung im topographisch gegliederten Sanierungsgebiet Aue/Schlema (Erzgebirge) und Vergleich mit Messungen. (in German) Immissionsschutz 2/99, ISSN 1430-9262. (Journal-Link)
• Haase, M., Exner, M. and Ketzel, M. (1998): Statistische Auswertung von Langzeitmessungen der bodennahen Radonkonzentration in ehemaligen Uranbergbaugebieten Ostdeutschlands. (in German) Immissionsschutz 1/98, ISSN 1430-9262. (Journal-Link)

• Ketzel, M., Palmgren, F. (2008): Opdatering af vurdering af anvendelse af SCR-katalysatorer på tunge køretøjer som virkemiddel til nedbringelse af NO² forureningen i de største danske byer, Danmarks Miljøundersøgelser, Aarhus Universitet.- Fagligt rapport fra DMU 660: 38 s.(PDF, 1000 KB)
• Kemp, K., Ellermann, T., Brandt, J., Christensen, J.H., Ketzel, M., Jensen, S.S. 2008, The Danish Air Quality Monitoring Programme, National Environmental Research Institute, University of Aarhus. NERI Technical Report No. 681. (PDF, 1544 KB)
• Hertel, O., Jensen, S.S., Hvidberg, M., Ketzel, M., Berkowicz, R., Palmgren, F., Wåhlin, P., Glasius, M., Loft, S., Vinzents, P., Raaschou-Nielsen, O., Sørensen, M., Bak, H. (2008): Assessing the Impact of Traffic Air Pollution on Human Exposures and Linking Exposures to Health. in Road Pricing the Economy and the Environment, Springer-Verlag, Berlin Heidelberg, pp. 277.
• Berkowicz, R., Løfstrøm, P., Ketzel, M., Jensen, S.S. & Hvidberg, M. 2007: OML Highway. Phase 1: Specifikations for a Danish Highway Air Pollution Model. National Environmental Research Institute, University of Aarhus. - NERI Technical Report 633: 67 pp. (electronic). Available at: http://www.dmu.dk/Pub/FR633.pdf
• Glasius, M., Nielsen, P.K., Stubkjær, J., Bossi, R., Hertel, O., Ketzel, M., Wåhlin, P., Schleicher, O. & Palmgren, F. 2007: Partikler og organiske forbindelser fra træfyring -nye undersøgelser af udslip og koncentrationer. Danmarks Miljøundersøgelser, Aarhus Universitet. - Arbejdsrapport fra DMU 235: 41 s. (elektronisk). Findes på: http://www.dmu.dk/Pub/AR235.pdf
• Kemp, K., Ellermann, T., Brandt, J., Christensen, J. & Ketzel, M. 2007: The Danish Air Quality Monitoring Programme, 2007. Annual Summary for 2006. National Environmental Research Institute, University of Aarhus. - NERI Technical Report 623: 41 pp. (electronic). Available at: http://www.dmu.dk/Pub/FR623.pdf
• Palmgren, F., Berkowicz, R., Ketzel, M. & Winther, M. 2007: Vurdering af anvendelse af SCR-katalysatorer på tunge køretøjer som virkemiddel til nedbringelse af NO2-forureningen i de større danske byer. Danmarks Miljøundersøgelser, Aarhus Universitet. - Faglig rapport fra DMU 620: 41 s. (elektronisk). Findes på: http://www.dmu.dk/Pub/FR620.pdf
• Jensen, S.S. & Ketzel, M. (2006): Miljøvurdering af fremskyndelse af partikelfiltre på person- og varebiler. Luftkvalitet og befolkningseksponering for PM_2.5. Danmarks Miljøundersøgelser. - Arbejdsrapport fra DMU 232: 43 s.(PDF, 846 KB)
• Ketzel M. & Düring I. (2005): Climatic Assessment for Construction Plan No. 195 in Leipzig. Report 70228-05-02. Lohmeyer Consulting Engineers, Dresden, Germany. (In German)
• Düring I. & Ketzel M. (2005): Air Quality Assessment for Construction Plan No. 195 in Leipzig. Report 70228-05-01. Lohmeyer Consulting Engineers, Dresden, Germany. (In German)
• Palmgren, F. et al. (2005): Luftforurening med partikler i Danmark. Miljøprojekt nr. 1021, Miljøstyrelsen. Available under: http://www.mst.dk/
• Jensen, S.S., Ketzel, M., Berkowicz, R., Palmgren, F., Høj, J. & Krawack, S. 2005: Virkemidler til overholdelse af NO2 grænseværdier for luftkvalitet i København. Miljøkontrollen, Københavns Kommune. Udført af Danmarks Miljøundersøgelser og TetraPlan. 111 s. Available at: http://www.miljoe.kk.dk/luft/rapporter
• Olesen, H.R., Løfstrøm, P., Berkowicz, R. & Ketzel, M. 2005: Regulatory odour model development: Survey of modelling tools and datasets with focus on building effects. National Environmental Research Institute. - NERI Technical Reports 541: 62 pp. (electronic). Available at: http://www2.dmu.dk/1_viden/2_Publikationer/3_fagrapporter/rapporter/FR541.PDF
• Ketzel, M. (2004): Dispersion and Transformation of Traffic Exhaust Particles in the Urban Atmosphere. Doctoral dissertation. Department of Physics, Lund University. ISBN 91-628-5992-7. (Abstract and Introduction)
• Ketzel, M. (2003): Experimental and modelling studies of particle and gaseous pollutants in urban street environments. Licentiate thesis. Department of Physics, Lund University. Report: LUTFD2/(TFKF-3093)/1-69/2003.
• Palmgren, F., Wåhlin, P., Berkowicz, R., Ketzel, M., Illerup, J. B., Nielsen, M., Winther, M., Glasius, M., and Jensen, B. (2003): Aerosols in Danish Air (AIDA), Mid-term report 2001-2002. National Environmental Research Institute, Roskilde, Denmark. NERI Technical Report No. 460. (PDF, 1002 KB)

• Ketzel, M.: Modelling Traffic Particles in Urban Environments. NOSA Aerosol Symposium, Helsingør, Denmark, 8-9 November 2007. Available at: http://www2.dmu.dk/atmosphericenvironment/NOSA2007/Downloads/NOSA2007_proceedings.pdf
• Stubkjær, J., Wåhlin, P., Olesen, H.R., Ketzel, M., Bossi, R., Palmgren, F., Hertel, O. & Glasius, M.: Air Pollution from Domestic Wood Combustion. NOSA Aerosol Symposium 2007, Airborne Nano-particles: New Technologies and Impacts, Helsingør, Denmark, November 8-9, 2007.
  Available at: http://www2.dmu.dk/Pub/PO_jest_2007_NOSA.pdf
• Ketzel, M.: Modelling ultrafine particles in urban environments. Ultrafine Particles in Urban Air, UFIPOLNET Final Conference, Dresden, Germany, 23-24 October 2007. Available at: http://www.umwelt.sachsen.de/lfug/documents/UFIPOLNET_conf_proc_071012.pdf
• Klose, S., Birmili, W., Tuch, T., Wehner, B., Wiedensohler, A., Franck, U. & Ketzel, M.: An analysis of traffic-induced particle number emissions based on long lasting roadside and urban background measurements. Poster presented at the Ultrafine Particles in Urban Air, Dresden, Germany, 23-24 October 2007.
• Palmgren, F., Berkowicz, R., Ketzel, M. & Winther, M.: Elevated NO2 pollution in Copenhagen due to direct emission of NO2 from road traffic. Poster presented at the 2nd ACCENT Symposium, Atmospheric Composition Change, Urbino, Italy, July 23-27, 2007.
• Berger, J., Berkowicz, R., Walker, S-E., Denby, B., Løfstrøm, P., Ketzel, M. & Kukkonen, J.: Evaluation And Inter-Comparison Of Open Road Line Source Models Currently Being Used In The Nordic Countries: A NORPAC Project. 11th Conference on Harmonisation within Atmospheric Dispersion Modelling for Regulatory Purposes, Cambridge, UK, July 2-5, 2007. Available at: http://www.harmo.org/Conferences/Proceedings/_Cambridge/publishedSections/PPT/H11-093_Berger.pdf
• Di Sabatino, S., Franke, J., Olesen, H.R., Ketzel, M., Berkowicz, R., Buccolieri, R., Baklanov, A., Balczò, M., Barmpas, F., Bartzis, J., Borrego, C., Brzozowski, K., Costa, A.M., Efthimiou, G., Goricsan, I., Hellsten, A., Hirtl, M., Martilli, A., Moussiopulos, N., Nuterman, R., Piringer, M., Reisin, T., Saloranta, J., Santiago, J.L., Schlünzen, H., Starchenko, A. & Trini Castelli, S.: COST 732 in practice: the MUST model validation exercise. 11th International Conference on Harmonisation within Atmospheric dispersion Modelling for Regulatory Purposes, Cambridge, UK, 2-5 July 2007.
• Glasius, M., Bilde, M., Ketzel, M., Pryor, S., Kristensen, T., Ström, J. & Sørensen, L.G.: Global marine aerosol studies on the Galathea 3 expedition. Poster presented at the Eighth Informal Conference on Atmospheric and Molecular Science, Helsingør, Denmark, June 8-10, 2007.
• Ketzel, M., Berkowicz, R., Hvidberg, M., Jensen, S.S. & Raaschou-Nielsen, O.: Validation of AirGIS - a GIS-based Air Pollution and Human Exposure Modelling System . AIRPOLIFE annual meeting, Copenhagen, Denmark, June 6, 2007.
• Olesen, H.R., Berkowicz, R., Ketzel, M. & Løfstrøm, P.: Using a ‘Wiki’ to pool experiences on atmospheric dispersion. Poster presented at the 6th International Conference on Urban Air Quality, Cyprus, Greece, 27-29 March 2007.
• Olesen, H.R., Berkowicz, R., Ketzel, M. & Løfstrøm, P.: Validation of OML, AERMOD/PRIME and MISKAM using the Thompson wind tunnel data set for simple stack-building configurations. 6th International Conference on Urban Air Quality, Cyprus, Greece, 27-29 March 2007. Available at: http://www2.dmu.dk/atmosphericenvironment/Docs/Using_Thompsons_data.pdf
• Pohjola, M., Pirjola, L., Kukkonen, J., Karppinen, A., Härkönen, J., Ketzel, M. & Kulmala, M.: The Modelling Of The Vehicular Exhaust Plumes in a roadside environment, by coupling a dispersion model and an aerosol process model. 6th International Conference on Urban Air Quality, Limasol, Cyprus, 27-29 March 2007.
• Ketzel, M., Omstedt, G., Johansson, C., Düring, I., Berkowicz, R., Pohjola, M., Oettl, D., Wåhlin, P., Glasius, M. & Palmgren, F. 2006: Vehicle emission factors for PM2.5/PM10 exhaust and non-exhaust and soot emissions. In: Vehkamäki, H., Bergman, T., Julin, J., Salonen, M. & Kulmala, M. (eds.): NOSA 2006 Aerosol symposium, combined with the X Finnish National Aerosol Symposium, Finnish-Czech Aerosol Symposium, and BACCI workshop, Helsinki 8.-10.11. 2006. Finnish Association for Aerosol Research. - Report Series in Aerosol Science A 83: 143-145.
• Ketzel, M., Omstedt, G., Johansson, C., Düring, I., Lohmeyer, A., Berkowicz, R., Pohjola, M. & Wåhlin, P.: Intercomparison of PM2.5/PM10 exhaust and non-exhaust emission factors in nordic and central european countries. Nätverkssymposium 2006, Lund, Sweden, 16-17 October 2006.
  Available at: Presentation ppt
• Swietlicki, E., Massling, A., Löndahl, J., Dahlberg, I., Kristensson, A., Nilsson, H., Gustafsson, S. & Ketzel, M.: Particle number size distributions at an urban site in southern Sweden: Estimates of the Contribution of Urban Particle Sources. 7th International Aerosol Conference, St. Paul, Minnesota, USA, September 10-15, 2006. Available at: FinalProgram
• Wehner, B., Rose, D., von Löwis, S., Uhrner, U., Ketzel, M. & Wiedensohler, A.: Emission factors in a street canyon and on highways. Exhaust gas particles in the atmosphere, Karlsruhe, Germany, 29-30 June 2006.
• Jensen, S.S., Løfstrøm, P., Berkowicz, R., Olesen, H.R., Frydendall, J., Madsen, I-L., Ketzel, M., Fuglsang, K. & Hummelshøj, P. 2006: Mapping of air quality and human exposure along motorways. In: Joumard, R. (ed): Proceedings of the 2nd Conference Environment & Transport including the 15th conference Transport and Air Pollution, Reims, 12-14 June 2006. Institut National de Recherche sur les Transports et leur Sécurité. - Actes 107: 287-294.
• Jensen, S.S., Skov, H., Brandt, J., Frohn, L.M., Palmgren, F., Ketzel, M., Illerup, J.B., Winther, M., Jensen, M.T., Petersen, L.K., Nielsen, J.S., Jørgensen, K. & Karlsson, K.: Environmental and Health Impact Assessment of Scenarios for Renewable Energy Systems with Hydrogen (HYSCENE). Poster presented at the Public Meeting about Strategic Energy Research organised by the Programme Commission on Energy and Environment under the Danish Strategic Research Council, Ingeniørhuset, Copenhagen, Denmark, June 12, 2006.
• Ketzel, M., Wåhlin, P., Glasius, M., Mønster, J.G., Berkowicz, R. & Palmgren, F. 2006: Particle emissions from traffic and biomass burning – Results of several studies in Denmark. - Geophysical Research Abstracts 8: 10165. European Geosciences Union General Assembly 2006, Vienna, Austria, 02 – 07 April 2006. Available at: http://www.cosis.net/abstracts/EGU06/10165/EGU06-J-10165-1.pdf
• Palmgren, F., Wåhlin, P., Glasius, M., Berkowicz, R., Ketzel, M., Mønster, J.G. & Jensen, B.: Characterisation of aerosols in Danish air. Similarities and Differences in Airborne Particulate Matter, exposure and Health Effects over Europe, Vienna, Austria, April 3-5, 2006. Available at: Conference_Proceedings
• Glasius, M., Wåhlin, P., Ketzel, M., Mønster, J.G., Bossi, R. & Berkowicz, R.: Emission and characterisation of particles from wood stoves. 3rd Nordic Air Pollution Workshop, Copenhagen, Denmark, March 22-23, 2006. Available at: Workshopabstracts
• Brandt, J., Christensen, J., Frohn, L.M., Berkowicz, R., Ambelas Skjøth, C., Geels, C., Hansen, K.M., Frydendall, J., Heedegaard, G.B., Hertel, O., Jensen, S.S., Hvidberg, M., Ketzel, M., Olesen, H.R., Løfstrøm, P., Zlatev, Z. & Andersen, M.S. 2006: THOR - An operational and integrated model system for air pollution forecasting, management and assessment from global to local scale. In: Fuzzi, S. & Maione, M. (eds.): The Changing Chemical Climate of the Atmosphere. First Accent Symposium, Urbino, September 12-16, 2005. The European Network of Excellence. Pp. 113-118.
• Ketzel, M., Glasius, M., Wåhlin, P., Jensen, B., Andersen, P., Ström, J., Hansson, H.C. & Palmgren, F.: A simple optical soot sensor - laboratory tests and first field data on wood stove emissions. Nordic Society for Aerosol Research (NOSA), Göteborg, Sweden, 3-4 November 2005.
• Ketzel, M., Pagels, J., Wåhlin, P., Glasius, M., Jensen, B., Swietlicki, E. & Palmgren, F.: Volatility measurements of submicrometer particles in a street canyon in Copenhagen. Nordic Society for Aerosol Research (NOSA), Göteborg, Sweden, 3-4 November 2005.
• Glasius, M., Mønster, J.G., Bossi, R., Berkowicz, R., Ketzel, M., Wåhlin, P. & Palmgren, F.: Measurements of particles and PAH from residential wood combustion in Denmark. European Aerosol Conference 2005, Ghent , Belgium, 28 August - 2 September 2005.
• Jensen, S.S., Ketzel, M., Berkowicz, R., Palmgren, F., Krawack, S. & Høj, J. : Virkemidler til overholdelse af NO2 grænseværdier for luftkvalitet i København. Trafikdage på Aalborg Universitet, Aalborg, Danmark, 22-23 August 2005. Findes på: Proceedings
• Massling, A., Löndahl, J., Ketzel, M., Jensen, B., Wåhlin, P., Bilde, M., Rosenbohm, E., Hansson, H.-C., Hallquist, M., Lunder, C. & Swietlicki, E.: Intercomparison of Particle number size spectrometers. 2nd Joint BACCI Meeting, Kuopio, Finland, 13-15 June 2005.
• Glasius, M., Mønster, J.G., Bossi, R., Berkowicz, R., Ketzel, M., Wåhlin, P. & Palmgren, F.: Particles and PAH from residential wood combustion in Denmark. Sixth Informal Conference on Atmospheric and Molecular Science, Helsingør, Denmark, June 3-5, 2005.
• Jensen, S.S., Ketzel, M., Berkowicz, R., Hvidberg, M., Høj, J. & Krawack, S.: Impact Assessment of Abatement Measures for Compliance with Air Quality Limit Values for 2010 in Copenhagen . 14th International Symposium Transport and Air Pollution, Graz, Austria, June 1-3, 2005. Available at: http://vkm-thd.tugraz.at/Veranstaltung/PresentationsTAP2005/Jensen.pdf
• Ketzel, Matthias, Gunnar Omstedt, Christer Johansson, Ingo Düring, Lars Gidhagen, Achim Lohmeyer, Ruwim Berkowicz, Peter Wåhlin: Estimation and validation of PM2.5/PM10 exhaust and non-exhaust emission factors for street pollution modelling.  5th Interntl. Conf. on Urban Air Quality (UAQ 2005), Valencia, Spain, 29-31 March 2005.
• Berkowicz, R., Ketzel, M., Jensen, S.S., Hvidberg, M. & Raaschou-Nielsen, O.: Evaluation and application of OSPM for traffic pollution assessment for large number of street locations. 5th International Conference on Urban Air Quality (UAQ), Valencia, Spain, 29-31 March 2005.
• Kukkonen, J., Sokhi, R.S. & Ketzel, M.: Modelling of urban air particulate matter - future perspectives and implications for policy. 5th International Conference on Urban Air Quality, Valencia, Spain, 29-31 March 2005.
• Pohjola, M.A., Pirjola, L., Kukkonen, J., Karppinen, A., Härkönen, J. & Ketzel, M.: Modelling of dispersion and aerosol processes in a roadside environment, and evaluation with measured data. 5th International Conference on Urban Air Quality, Valencia, Spain, 29-31 March 2005.
• Ketzel, M., L. Gidhagen, M. Haakana, M. Hallquist, H.-C. Hansson, M. Kulmala, O.J. Nielsen, D. Simpson, L. H. Slørdal and E. Swietlicki: NORPAC - A Nordic Project on PM Measurements and Modelling: Overview and First Results. NOSA Symposium in Stockholm, 11-12 November 2004.
• Ketzel M., R. Berkowicz, P. Wåhlin and F. Palmgren: Modelling the Dispersion and Transformation of Traffic Particle Emissions in Street and Urban Environment. European Aerosol Conference (EAC) in Budapest, Hungary, 6-10 September 2004.
• Ketzel, M.: Time scales of aerosol dynamics in urban environments. Symposium of Nätverket, Lund, Sweden, April 15-16, 2004.
• Ketzel, M. and Berkowicz, R.: Modelling of ultrafine particles at street level and urban background. Presentation at the NOSA Symposium in Copenhagen, 13-14 November 2003.
• Wåhlin, P., Mønster, J., Glasius, M., Ketzel, M., Berkowicz, R. and Palmgren, F.: Measurements of wood burning emissions in Denmark - First results. NOSA Aerosol Symposium, Aerosols and Water, Copenhagen, 13-14 November 2003.
• Swietlicki, E., Ketzel, M., Kristensson, A., Wåhlin, P., Gudmundsson, A., Dahl, A., Gharibi, A., Nilsson, T., Berkowicz, R., Palmgren, F., Johansson, C., Gustafsson, M. and Blomqvist, G.: Aerosol Particle Emissions from Traffic Sources: Tail-Pipe and Others - Results from Several Studies in Sweden and Denmark. BACCI Workshop on Surface flux, Micrometerology and Chemistry. WP1, Fluxes of biogenic precursor compounds. WP2. Aerosol source emission and deposition fluxes. WP7. Emissions of particles in Europe, Risø, Roskilde, 11-12 November 2003.
• Wåhlin, P., Ketzel, M. and Palmgren F.: Dependence of traffic particle profiles on meteorological conditions - Measurements in a street canyon in Copenhagen. Presentation at the 1st International Symposium on Incomplete Combustion in Kuopio, Finland, 9-11 November, 2003.
• M. Ketzel, P. Wåhlin, R. Berkowicz and F. Palmgren: Experimental and modelling studies of ultrafine particle concentrations in urban street and background. Presentation at the 7th ETH-Conference on Combustion generated Nanoparticles in Zurich, 18-20 August 2003.
• Ketzel, M.: Particles in the street environment - Jagtvej, Copenhagen. Presentation at Nätverket/SNAPs symposium in Göteborg, 7-8 April 2003. (www-Link)
• R. Berkowicz, M. Winther and M. Ketzel: TRAFFIC POLLUTION MODELLING AND EMISSION DATA. Presentation at the 4th Interntl. Conf. on Urban Air Quality - Measurement, Modelling and Management, Prague, Czech Republic, 25-28 March 2003.
• M. Ketzel, P. Wåhlin and R. Berkowicz: Street level versus urban background concentrations of submicron particles in Copenhagen - Measurements and first modelling studies. Presentation at the 6th ETH Conference on Nanoparticle-Measurements in Zurich, 19-21 August 2002.
• P. Kastner-Klein, M. Ketzel, S. Di Sababtino, R. Berkowicz, R. Britter, E. Fedorovich: Significance of traffic produced turbulence for urban dispersion modeling. Proceedings of the 4th AMS Symposium on the Urban Environment, Norfolk, Virginia, USA, 20-24 May 2002.
• M. Ketzel, P. Wåhlin, O. Le Bihan and G. Thymen: Measurements of Ultrafine Particles in Copenhagen. Presentation at the NOSA Symposium in Lund, 7-8 November 2001.
• M. Ketzel, R. Berkowicz, A. Lohmeyer, P. Kastner-Klein and T. Flassak: Adaptation of results from CFD-models and wind-tunnels for practical traffic pollution modelling. Presentation at 7th Int. Conf. on Harmonisation within Atmos. Dispersion Modelling, Belgirate, Italy, 28-31 May 2001.
• P. Louka, M. Ketzel, P. Sahm, E. Guilloteau, N. Moussiopoulos and J-F. Sini: CFD intercomparison on a full-scale street-canyon. Presentation at 7th Int. Conf. on Harmonisation within Atmos. Dispersion Modelling, Belgirate, Italy, 28-31 May 2001.
• A. Gamez, R. Berkowicz, M. Ketzel and A. Lohmeyer: Determination of the "non exhaust pipe" PM10 emissions of roads for practical traffic air pollution modelling. Presentation at 7th Int. Conf. on Harmonisation within Atmos. Dispersion Modelling, Belgirate, Italy, 28-31 May 2001.
• M. Schatzmann, C. Chauvet, B. Leitl, T. Glanert, R. Berkowicz, M. Ketzel and F. Palmgren: Comparison of the Jagtvej field data set with corresponding wind tunnel results. Presentation at 7th Int. Conf. on Harmonisation within Atmos. Dispersion Modelling, Belgirate, Italy, 28-31 May 2001.
• P. Louka, P. Sahm, M. Ketzel, G. Theodoridis, J-F. Sini and N. Moussiopoulos: An intercomparison of microscale models for the flow and dispersion characteristics in urban areas. EUROTRAC-2 Symposium, Garmisch-Partenkirchen, Germany, March 2000.