GHS hazard class · Environmental hazards
Hazardous to the ozone layer
Substances hazardous to the ozone layer are those which, on the evidence available, may endanger the structure or function of the stratospheric ozone layer.
What it means
Releasing the substance to the air can contribute to depletion of the ozone layer.
What to do
Avoid release to the atmosphere, recover or recycle as required by local rules, and dispose of it through approved channels.
This is general guidance for the class. Your product's safety data sheet takes precedence.
Categories and hazard statements
| Code | Category | Statement | Pictogram | Signal word |
|---|---|---|---|---|
| H420 | Category 1 | Harms public health and the environment by destroying ozone in the upper atmosphere | GHS07 | Warning |
Chemicals with hazardous to the ozone layer hazard codes
Chemicals in our database whose primary classification includes any current Hazardous to the ozone layer code (H420).
1 chemical in our database. Classification comes from each chemical's primary GHS source, so a supplier's SDS may differ.
Hazardous to the ozone layer: frequently asked questions
What is the GHS hazard class "Hazardous to the ozone layer"?
Substances hazardous to the ozone layer are those which, on the evidence available, may endanger the structure or function of the stratospheric ozone layer.
Which hazard statements belong to Hazardous to the ozone layer?
The current hazard statements for this class are H420.
Which pictograms and signal words are used for Hazardous to the ozone layer?
Pictograms: GHS07 (Exclamation Mark). Signal word: Warning, depending on the category.
What should I do when working with a hazardous to the ozone layer hazard?
Avoid release to the atmosphere, recover or recycle as required by local rules, and dispose of it through approved channels.
https://pubchem.ncbi.nlm.nih.gov/ghs/ghscode_10.txt (UN GHS Revision 10, retrieved 2026-10-12)