Abbreviation for granular biopersistent particles, dust particles without a known intrinsic toxicity. This includes all dust particles (in the micro- as well as in the nanometer scale), which 1. can be inhaled, 2. exhibit no systemic toxic effects and 3. which are not or only poorly degradable by the human body.

Genotoxic effects are damages to the genetic material of organisms (DNA). They can lead to mutations or increase the error rate in the doubling of DNA at each cell division. Genotoxicity is therefore not necessarily associated with mutagenicity.