Definition
The Globally Harmonised System is a United Nations framework for classifying and communicating chemical hazards in a consistent way across borders. Before it existed, a chemical could carry a different hazard classification and label in each country. GHS provides a shared vocabulary of hazard classes, standard pictograms and standard hazard and precautionary statements so that the same substance is described the same way wherever it is sold.
How it is applied
GHS is a model, not a law on its own. Each jurisdiction adopts it through its own legislation, and adoptions can differ in detail and version. The EU implements GHS through the CLP Regulation, which makes the system binding for substances and mixtures placed on the EU market.
What it covers
The system shapes the everyday hazard label you see on a chemical product, from the red-bordered pictograms to the wording of the warnings. It also underpins how serious categories such as CMR hazards are defined and communicated.
Note: general educational information, not legal advice. Check the official source before relying on it.