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Figure: Partners and measurement sites in GUAN. Colour coding of measurement sites: Alpine (light blue), rural background (green), urban background (orange), traffic (red).


Welcome to the German Ultrafine Aerosol Network (GUAN)

GUAN is a joint observation network, which aims to improve our understanding of atmospheric aerosol particles with regard to

  • human particle exposure
  • aerosol climate effects

GUAN provides continuous ultrafine particle measurements:

  • particle number size distributions, measured by custom-built SMPS, TDMPS, or TSMPS.
  • particle number size distributions after heating to 300°C in a Thermodenuder (TD)
  • soot mass concentrations, measured by MAAP model 5012

Navigate to GUAN resources

Applications of GUAN data

Applications of the data cover research topics as well as public service:

  • Assessment of particle exposure
  • Characterisation of synoptic-scale air masses
  • Validation of aerosol transport models (global and regional scale)

We see GUAN as part of the European observation network ACTRIS where experimental methods are homogenised and data made available to public and research users. Parts of the GUAN data can be accessed on EBAS under the given data policy.


  • German Federal Environment Ministry (BMU) grant F&E 370343200 (German title: "Erfassung der Zahl feiner und ultrafeiner Partikel in der Außenluft"), 2008-2010.
  • German Federal Environment Ministry (BMU) grant F&E 371143232 (German title: "Trendanalysen gesundheitsgefährdender Fein- und Ultrafeinstaubfraktionen unter Nutzung der im German Ultrafine Aerosol Network (GUAN) ermittelten Immissionsdaten durch Fortführung und Interpretation der Messreihen"), 2012-2014.

Main references:

  • Birmili, W., Weinhold, K., Rasch, F., Sonntag, A., Sun, J., Merkel, M., Wiedensohler, A., Bastian, S., Schladitz, A., Löschau, G., Cyrys, J., Pitz, M., Gu, J., Kusch, T., Flentje, H., Quass, U., Kaminski, H., Kuhlbusch, T. A. J., Meinhardt, F., Schwerin, A., Bath, O., Ries, L., Gerwig, H., Wirtz, K., and Fiebig, M.: Long-term observations of tropospheric particle number size distributions and equivalent black carbon mass concentrations in the German Ultrafine Aerosol Network (GUAN), Earth Syst. Sci. Data, 8, 355-382, doi:10.5194/essd-8-355-2016, 2016. Download at ESSD
  • Birmili, W., Sun, J., Weinhold, K., Merkel, M., Rasch, F., Wiedensohler, A., Bastian, S., Löschau, G., Schladitz, A., Quass, U., Kuhlbusch, T.A.J., Kaminski, H., Cyrys, J., Pitz, M., Gu, J., Kusch, T., Flentje, H., Meinhardt, F., Schwerin, A., Bath, O., Ries, L., Gerwig, H., Wirtz, K., Weber, S.: Atmospheric aerosol measurements in the German Ultrafine Aerosol Network (GUAN) - Part III: Black Carbon mass and particle number concentrations 2009-2014, Gefahrst. Reinh. Luft, 75(11/12), 479-488, 2015. Download PDF courtesy of SPRINGER-VDI-VERLAG ©2015
  • Nordmann, S., W. Birmili, K. Weinhold, K. Müller, G. Spindler, and A. Wiedensohler:, Measurements of the mass absorption cross section of atmospheric soot particles using Raman spectroscopy. J. Geophys. Res. Atmos., 118, 12075–12085, doi:10.1002/2013JD020021, 2013.
  • Rückerl, R., A. Schneider, S. Breitner, J. Cyrys and A. Peters: Health effects of particulate air pollution: A review of epidemiological evidence. Inhalation Toxicology, 23(10): 555–592, 2011.

Click here to see the full list of GUAN References and research results.

Associated Projects

  • UFIREG: Ultrafine Particles – an evidence based contribution to the development of regional and European environmental and health policy
  • UltraSchwarz - Ultrafine particles and health in the German-Czech cross-border region


Click here to return to Aerosols and air quality.

Contact: Wolfram Birmili, wolfram.birmili(at)

Last changes: January 4, 2018.

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