Nanotechnologies have become a subject of consumer and environmental protection in the recent past. The small particles show a series of new properties — also in toxicological terms. The risks are known only to some extent. However, there is a lot of evidence that precaution is warranted. Environmental and consumer protection groups vehemently call for new or more demanding legal provisions. The Consumer Council chairs the nano project team of the european consumer associations and has also participated in a european standardisation project on labelling of nano materials.