Health hazard · Respiratory sensitisation
H334 — May cause allergy or asthma symptoms or breathing difficulties if inhaled
Health hazard statements describe what the substance does to a person exposed to it. 118 substances with a harmonised EU classification carry this code.
01 · Wording
What H334 says
May cause allergy or asthma symptoms or breathing difficulties if inhaled.
CLP Annex III · Health hazards
Respiratory sensitisation GHS chapter 3.4
Categories 1, 1A, 1B · pictogram GHS08 (health hazard) · signal word Danger
Unchanged since 2009.
Present in every UN GHS edition from Rev.3 (2009) to Rev.11 (2025), with the same wording throughout.
Nine editions of the UN model text, 86 hazard statements, 19 of which ever moved. Read the full story in what changed in UN GHS Rev.11.
02 · Languages
H334 in the 24 official EU languages
A label put on the market in an EU country must carry the wording of that country's own language version of CLP — not a translation of the English one. These 24 lines are quoted from the consolidated regulation, Annex III, and are the text to print.
| Language | Official wording of H334 |
|---|---|
| BG български Bulgarian | Може да причини алергични или астматични симптоми или затруднения в дишането при вдишване. |
| ES español Spanish | Puede provocar síntomas de alergia o asma o dificultades respiratorias en caso de inhalación. |
| CS čeština Czech | Při vdechování může vyvolat příznaky alergie nebo astmatu nebo dýchací potíže. |
| DA dansk Danish | Kan forårsage allergi- eller astmasymptomer eller åndedrætsbesvær ved indånding. |
| DE Deutsch German | Kann bei Einatmen Allergie, asthmaartige Symptome oder Atembeschwerden verursachen. |
| ET eesti Estonian | Sissehingamisel võib põhjustada allergia- või astma sümptomeid või hingamisraskusi. |
| EL ελληνικά Greek | Μπορεί να προκαλέσει αλλεργία ή συμπτώματα άσθματος ή δύσπνοια σε περίπτωση εισπνοής. |
| EN English English | May cause allergy or asthma symptoms or breathing difficulties if inhaled. |
| FR français French | Peut provoquer des symptômes allergiques ou d'asthme ou des difficultés respiratoires par inhalation. |
| GA Gaeilge Irish | D'fhéadfadh sé a bheith ina chúis le siomptóim ailléirge nó asma nó le deacrachtaí análaithe má ionanálaítear é. |
| HR hrvatski Croatian | Ako se udiše može izazvati simptome alergije ili astme ili poteškoće s disanjem. |
| IT italiano Italian | Può provocare sintomi allergici o asmatici o difficoltà respiratorie se inalato. |
| LV latviešu Latvian | Ja ieelpo, var izraisīt alerģiju vai astmas simptomus, vai apgrūtināt elpošanu. |
| LT lietuvių Lithuanian | Įkvėpus gali sukelti alerginę reakciją, astmos simptomus arba apsunkinti kvėpavimą. |
| HU magyar Hungarian | Belélegezve allergiás és asztmás tüneteket, és nehéz légzést okozhat. |
| MT Malti Maltese | Jista’ jikkawża sintomi ta' allerġija jew ta’ ażma jew diffikultajiet biex jittieħed in-nifs jekk jinxtamm. |
| NL Nederlands Dutch | Kan bij inademing allergie- of astmasymptomen of ademhalingsmoeilijkheden veroorzaken. |
| PL polski Polish | Może powodować objawy alergii lub astmy lub trudności w oddychaniu w następstwie wdychania. |
| PT português Portuguese | Quando inalado, pode provocar sintomas de alergia ou de asma ou dificuldades respiratórias. |
| RO română Romanian | Poate provoca simptome de alergie sau astm sau dificultăți de respirație în caz de inhalare. |
| SK slovenčina Slovak | Pri vdýchnutí môže vyvolať alergiu alebo príznaky astmy, alebo dýchacie ťažkosti. |
| SL slovenščina Slovenian | Lahko povzroči simptome alergije ali astme ali težave z dihanjem pri vdihavanju. |
| FI suomi Finnish | Voi aiheuttaa hengitettynä allergia- tai astmaoireita tai hengitysvaikeuksia. |
| SV svenska Swedish | Kan orsaka allergi- eller astmasymtom eller andningssvårigheter vid inandning. |
Source: CELEX:02008R1272-20260501, Annex III. © European Union, https://eur-lex.europa.eu — only the electronic Official Journal of the European Union is authentic. Irish is one of the 24 official languages and its H and P texts are printed inside the multilingual Annex tables, but no consolidated CLP has ever been published in Irish — which is why an Irish-primary label cannot be built here.
03 · Legal status
Where H334 is current
GHS is a United Nations model text, revised every two years, and each jurisdiction adopts a revision on its own timetable. A code can be legally current in one system and deleted in another — that is normal, not an error.
| Jurisdiction | Basis | Status of H334 |
|---|---|---|
| EU CLP | Regulation (EC) 1272/2008 CLP Annex IV, Part 2 (consolidated) | Current |
| US OSHA HazCom | 29 CFR 1910.1200 Appendix C UN GHS Rev.7 (final rule of 20 May 2024) | Current |
| US HazCom 2012 | legacy · GHS Rev.3 UN GHS Rev.3, Annex 3 | Current |
| UN GHS | Rev.11 (2025) UN GHS Rev.11, Annex 3 | Current |
Currently in force under: EU CLP, US OSHA HazCom, US HazCom 2012, UN GHS. Sources: EU CLP · US OSHA HazCom · US HazCom 2012 · UN GHS
04 · Substances
Substances carrying H334
Every entry whose harmonised CLP Annex VI classification includes this hazard statement. Substances with a reference page here open on this site; the rest open on ghssymbols.com. Of these, 8 are group entries such as “salts of picric acid” or “beryllium compounds” — Annex VI gives them no CAS number, so they are listed by Index No and have no page of their own.
- (1S,3S,5R,6R)-(4-nitrophenylmethyl)-1-dioxo-6-phenylace… CAS 54275-93-3
- (1S,4R,6R,7R)-(4-nitrophenylmethyl)3-methylene-1-oxo-7… CAS 76109-32-5
- (6R-trans)-7-amino-3-[([5-(carboxymethyl)-4-methyl-2-th… CAS 111298-82-9
- 1,2,3,6-tetrahydrophthalic anhydride [1]… CAS 85-43-8
- 1,3-Bis(1-isocyanato-1-methylethyl)benzene CAS 2778-42-9
- 1,3-Bis(isocyanatomethyl)benzene CAS 3634-83-1
- 1,5-naphthylene diisocyanate [containing < 0.1 % (w/w)… CAS 3173-72-6
- 2-(3-(prop-1-en-2-yl)phenyl)prop-2-yl isocyanate CAS 2094-99-7
- 2-Thiophenecarboxylic acid, 3-(isocyanatosulfonyl)… CAS 79277-18-2
- 2,2,4-trimethylhexamethylene-1,6-di-isocyanate [1]… CAS 16938-22-0
- 2,4,6-Triisopropyl-m-phenylene diisocyanate CAS 2162-73-4
- 2,5-bis-isocyanatomethyl-bicyclo[2.2.1]heptane Index No 615-029-00-X
- 2,9,11,13-Tetraazanonadecanethioic acid… CAS 85702-90-5
- 3-isocyanatomethyl-3,5,5-trimethylcyclohexyl isocyanate CAS 4098-71-9
- 3,3'-dimethylbiphenyl–4,4'-diyl diisocyanate CAS 91-97-4
- 4-Chlorophenyl Isocyanate CAS 104-12-1
- 4-isocyanatosulphonyltoluene CAS 4083-64-1
- 4,4'-methylenedi(cyclohexyl isocyanate) CAS 5124-30-1
- 8,9-dinorborn-5-ene-2,3-dicarboxylic anhydride CAS 123748-85-6
- 8,9,10-trinorborn-5-ene-2,3-dicarboxylic anhydride [1]… CAS 129-64-6
- Ammonium dichromate CAS 7789-09-5
- Ammonium hexachloroplatinate CAS 16919-58-7
- Ammonium tetrachloroplatinate(II) CAS 13820-41-2
- amylase, α- CAS 9000-90-2
- amylases with the exception of those specified… Index No 647-016-00-X
- benzene-1,2,4-tricarboxylic acid 1,2-anhydride CAS 552-30-7
- benzene-1,2:4,5-tetracarboxylic dianhydride CAS 89-32-7
- Benzoic acid, 2-(isocyanatosulfonyl)-, ethyl ester CAS 77375-79-2
- Benzoic acid, 2-[(isocyanatosulfonyl)methyl]-, methyl… CAS 83056-32-0
- Borate(1-), tetrafluoro-, nickel(2+) (2:1) CAS 14708-14-6
- bromelain, juice CAS 9001-00-7
- C,C'-azodi(formamide) CAS 123-77-3
- cellobiohydrolase, exo- CAS 37329-65-0
- Cellulase CAS 9012-54-8
- cellulases with the exception of those specified… Index No 647-004-00-4
- Chloroplatinic acid CAS 16941-12-1
- chromium trioxide CAS 1333-82-0
- chymotrypsin CAS 9004-07-3
- cis-1,2,3,6-tetrahydro-4-methylphthalic anhydride [1]… CAS 1694-82-2
- cobalt CAS 7440-48-4
- Cobalt chloride (cocl2) CAS 7646-79-9
- Cobalt diacetate CAS 71-48-7
- Cobalt dinitrate CAS 10141-05-6
- Cobalt Sulfate CAS 10124-43-3
- Cobaltous carbonate CAS 513-79-1
- cyclohexane-1,2-dicarboxylic anhydride [1]… CAS 85-42-7
- diamminediisocyanatozinc Index No 030-005-00-3
- diammonium nickel hexacyanoferrate CAS 74195-78-1
- diammonium peroxodisulphate CAS 7727-54-0
- dipotassium peroxodisulphate CAS 7727-21-1
- Dipotassium tetrachloroplatinate CAS 10025-99-7
- Disodium hexachloroplatinate CAS 16923-58-3
- Ethylenediamine CAS 107-15-3
- ficin CAS 9001-33-6
- glucosidase, β- CAS 9001-22-3
- glutaraldehyde CAS 111-30-8
- hexachloroplatinates with the exception of those… Index No 078-005-00-2
- hexahydro-4-methylphthalic anhydride [1]… CAS 19438-60-9
- Hexamethylene diisocyanate CAS 822-06-0
- hexasodium 6,13-dichloro-3,10-bis((4-(2,5-disulfonatoan… CAS 85153-92-0
- hydroxydisulfito platinum(II) acid CAS 61420-92-6
- Laccase CAS 80498-15-3
- Maleic Anhydride CAS 108-31-6
- Methyl Isocyanate CAS 624-83-9
- methylene diphenyl diisocyanate CAS 101-68-8
- nickel bis(4-cyclohexylbutyrate) CAS 3906-55-6
- nickel carbonate CAS 3333-67-3
- Nickel chromate CAS 14721-18-7
- Nickel Cyanide CAS 557-19-7
- nickel di(acetate) [1] nickel acetate [2] CAS 373-02-4
- Nickel dibenzoate CAS 553-71-9
- nickel dichlorate [1] nickel dibromate [2] ethyl… CAS 67952-43-6
- Nickel Dichloride CAS 7718-54-9
- Nickel dichromate CAS 15586-38-6
- nickel difluoride [1] nickel dibromide [2] nickel… CAS 10028-18-9
- nickel diformate [1] formic acid, nickel salt [2]… CAS 3349-06-2
- nickel dihydroxide [1] nickel hydroxide [2] CAS 12054-48-7
- nickel dilactate CAS 16039-61-5
- nickel dinitrate [1] nitric acid, nickel salt [2] CAS 13138-45-9
- nickel dipotassium bis(sulfate) [1] diammonium nickel… CAS 13842-46-1
- Nickel dithiocyanate CAS 13689-92-4
- nickel hydrogen phosphate [1] nickel bis(dihydrogen… CAS 14332-34-4
- Nickel perchlorate CAS 13637-71-3
- Nickel selenate CAS 15060-62-5
- Nickel sulfamate CAS 13770-89-3
- Nickel Sulfate CAS 7786-81-4
- Nickel(2+) selenite CAS 10101-96-9
- Nickel(2+) stearate CAS 2223-95-2
- nickel(II) octanoate CAS 4995-91-9
- nickel(II) sulfite [1] nickel tellurium trioxide [2]… CAS 7757-95-1
- nickel(II) trifluoroacetate [1] nickel(II) propionate… CAS 16083-14-0
- papain CAS 9001-73-4
- pepsin A CAS 9001-75-6
- Phenethyl isocyanate CAS 1943-82-4
- Phthalic Anhydride CAS 85-44-9
- Piperazine CAS 110-85-0
- piperazine hydrochloride [1] piperazine… CAS 6094-40-2
- potassium dichromate CAS 7778-50-9
- Potassium hexachloroplatinate(IV) CAS 16921-30-5
- proteases with the exception of those specified… Index No 647-014-00-9
- proteinase, microbial neutral CAS 9068-59-1
- rennin CAS 9001-98-3
- Silicate(2-), hexafluoro-, nickel(2+) (1:1) CAS 26043-11-8
- slimes and sludges, copper electrolyte refining… CAS 94551-87-8
- slimes and sludges, copper electrolytic refining… CAS 92129-57-2
- Sodium chloroplatinite CAS 10026-00-3
- Sodium Chromate CAS 7775-11-3
- Sodium Dichromate CAS 10588-01-9
- subtilisin CAS 9014-01-1
- Succinic anhydride CAS 108-30-5
- tert-butyl (5S,6R,7R)-3-bromomethyl-5,8-dioxo-7-(2-(2-p… CAS 33610-13-8
- Tetrachlorophthalic anhydride CAS 117-08-8
- tetrachloroplatinates with the exception of those… Index No 078-001-00-0
- tetrasodium 4-amino-5-hydroxy-3,6-bis[[4-[[2-(sulphonat… CAS 17095-24-8
- tetrasodium 5-(4,6-dichloro-5-cyanopyrimidin-2-ylamino)… Index No 016-036-00-5
- toluene diisocyanate CAS 91-08-7
- tosylchloramide sodium CAS 127-65-1
- trypsin CAS 9002-07-7
Nothing matches that filter.
All hazard statements
The full list of H-codes with the jurisdiction switch lives on the hazard statements hub. For what to do about the hazard, see precautionary statements (P-codes).
Wording quoted from the regulation named above. Substance counts come from harmonised classifications in CLP Annex VI — the statements on a real product also depend on the supplier's own classification. Always check the supplier safety data sheet.