Flemming R. Cassee is RIVM's chief science officer (CSO) and senior inhalation toxicologist and is involved in research into the harmful health effects of airborne particles (particulate matter, nanomaterials, microplastics), gaseous components (ozone, nitrogen dioxide) and mixtures (wood smoke, aircraft cabin air, indoor environment, air pollution). Flemming Cassee is also Professor of Inhalation Toxicology at Utrecht University- Institute for Risk Assessment Science.

RIVM’s strong point is translating scientific knowledge in such a way that policy makers can use it to substantiate their choices. RIVM is independent and non-profit; it is all strictly about the relevance to society. In this institute I can fulfil my ambitions in science and as someone who is at the centre of the knowledge community, through participation in international research projects and advisory committees.

Flemming Cassee likes to work in a multidisciplinary team to connect science, policy and regulation. “I simply achieve more with cooperation and that is what the RIVM benefits the most from.” He regularly publishes scientific articles in international journals and presents research results at national and international conferences and RIVM reports. He is also a member of a number of renowned national and international advisory committees. In addition to air pollution, attention is also paid to the safety of nanomaterials and the risks of micro and nanoplastics in the air. In his role as CSO, he is the delegated client on behalf of the director-general Prof.dr.ir. J. (Hans) Brug for the Strategic Programme RIVM. This programme is RIVM-wide and focuses on research, innovation and knowledge development in preparation for the questions of 'tomorrow'.

Flemming Cassee is an advisor to, among others, the Ministry of Infrastructure and Water Management, the Health Council, the World Health Organization (WHO (World Health Organization)), the European Commission, US EPA (United States Environmental Protection Agency) United States Environmental Protection Agency and the American Health Effects Institute. He is also editor of Particle and Fiber Toxicology and reviewer for a large number of international scientific journals, as well as member of the editorial board of various journals. From his position as a professor, he contributes to education and supervises master students (MSc (master of science)) and PhD students.

Areas of expertise

  • Inhalation toxicology
  • Airborne particulate matter
  • Nanomaterials
  • Nanotechnology
  • Particle toxicology
  • Air pollution


E-mail: DMG-Secr@rivm.nl