Health hazard · Acute toxicity - inhalation

H331 — Toxic if inhaled

Health hazard statements describe what the substance does to a person exposed to it. 210 substances with a harmonised EU classification carry this code.

EU CLP: currentUS OSHA HazCom: currentUS HazCom 2012: currentUN GHS: current

01 · Wording

What H331 says

Official

Toxic if inhaled.

Source

CLP Annex III · Health hazards

Classification

Acute toxicity - inhalation GHS chapter 3.1

Category 3 · pictogram GHS06 (skull and crossbones) · signal word Danger

UN GHS history

Unchanged since 2009.

Rev.3 2009

Rev.4 2011

Rev.5 2013

Rev.6 2015

Rev.7 2017

Rev.8 2019

Rev.9 2021

Rev.10 2023

Rev.11 2025

wording never changed

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 · Legal status

Where H331 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 H331
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

03 · On a label

H331 also appears combined

CLP Annex III defines combined hazard statements as single label elements. H331 is a component of 3 of them — this is how you will actually see it printed. The combinations have no pages of their own: a plus sign in a URL has to be encoded and breaks in other people's links and in analytics.

Code	Combined statement
H301+H331	Toxic if swallowed or if inhaled. CLP verbatim: Toxic if swallowed or if inhaled
H311+H331	Toxic in contact with skin or if inhaled. CLP verbatim: Toxic in contact with skin or if inhaled
H301+H311+H331	Toxic if swallowed, in contact with skin or if inhaled. CLP verbatim: Toxic if swallowed, in contact with skin or if inhaled

04 · Substances

Substances carrying H331

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, 16 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.

210 of 210 shown

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.