GHS hazard class · Health hazards
Sensitization, respiratory
A respiratory sensitizer is a substance that causes hypersensitivity of the airways after inhalation. Later exposure can trigger asthma-like symptoms or breathing difficulties.
What it means
Breathing the dust, vapor or mist can lead to an allergy of the airways. Once sensitized, a person may react to very small amounts.
What to do
Avoid breathing dust, fumes, vapor or mist. Use ventilation or local exhaust and wear respiratory protection where the SDS says to. If breathing problems occur, move to fresh air and get medical attention.
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 |
|---|---|---|---|---|
| H334 | Category 1, 1A, 1B | May cause allergy or asthma symptoms or breathing difficulties if inhaled | GHS08 | Danger |
Chemicals with sensitization, respiratory hazard codes
Chemicals in our database whose primary classification includes any current Sensitization, respiratory code (H334).
4 chemicals in our database. Classification comes from each chemical's primary GHS source, so a supplier's SDS may differ.
Sensitization, respiratory: frequently asked questions
What is the GHS hazard class "Sensitization, respiratory"?
A respiratory sensitizer is a substance that causes hypersensitivity of the airways after inhalation. Later exposure can trigger asthma-like symptoms or breathing difficulties.
Which hazard statements belong to Sensitization, respiratory?
The current hazard statements for this class are H334.
Which pictograms and signal words are used for Sensitization, respiratory?
Pictograms: GHS08 (Health Hazard). Signal word: Danger, depending on the category.
What should I do when working with a sensitization, respiratory hazard?
Avoid breathing dust, fumes, vapor or mist. Use ventilation or local exhaust and wear respiratory protection where the SDS says to. If breathing problems occur, move to fresh air and get medical attention.
https://pubchem.ncbi.nlm.nih.gov/ghs/ghscode_10.txt (UN GHS Revision 10, retrieved 2026-10-12)