The basis of this system is the so-called UN-GHS which is a recommendation of the United Nations and which must be implemented by the individual states. The European Commission introduced GHS pursuant to the CLP regulation (Classification, Labelling and Packaging) in January 2009.
According to this CLP regulation the requirements for classifying and labelling have had to be implemented since December 2010 for substances and since June 2015 for mixtures. All substances and mixtures are assigned hazard classes and hazard categories and labelled with corresponding hazard symbols.