Nanoaerosols are composed of nanoparticles which may originate from different sources. Already about 10 000 natural nanoparticles per cubic centimetre of air are present even in the "pure" atmosphere of our mountains. This very high level may be enhanced by anthropogenic activities: unwanted production of nanoparticles in combustion processes called Incidental particles and Engineered particles produced intentionally in laboratories and in the industry. The detection sensitivity for engineered nanoparticles is limited by the high background noise due to Natural and Incidental nanoparticles.
CEA is a French government-funded technological research organisation in four main areas: low-carbon energies, defense and security, information technologies and health technologies. A prominent player in the European Research Area, it is involved in setting up collaborative projects with many partners around the world.