Editing Carcinogen (section)

=== Globally Harmonized System ===
The [[Globally Harmonized System of Classification and Labelling of Chemicals]] (GHS) is a [[United Nations]] initiative to attempt to harmonize the different systems of assessing chemical risk which currently exist (as of March 2009) around the world. It classifies carcinogens into two categories, of which the first may be divided again into subcategories if so desired by the competent regulatory authority:
* Category 1: known or presumed to have carcinogenic potential for humans
** Category 1A: the assessment is based primarily on human evidence
** Category 1B: the assessment is based primarily on animal evidence
* Category 2: suspected human carcinogens