H304 · Hazard statementMay be fatal if swallowed and enters airways

Hazard statementHealth

H304 is the GHS hazard statement “May be fatal if swallowed and enters airways”. It is used for Aspiration hazard (chapter 3.10), Category 1. The English wording is the same as UN GHS Rev.11 in US OSHA, EU CLP and Canada. Canada’s official French text is “Peut être mortel en cas d’ingestion et de pénétration dans les voies respiratoires” and Mexico’s Spanish text is “Puede ser mortal en caso de ingestión y de penetración en las vías respiratorias”. The UN GHS Rev.11 label matrix lists 4 precautionary statements for it (UN only).

Maintained by Valenc. Data checked 2026-10-20.

Heading text: UN GHS Rev.11 Annex 3. Wording can differ by jurisdiction; see the table below.

Wording by jurisdiction

UN GHS Rev.11

Same as UN

GHS Rev.11 (2025), Annex 3

May be fatal if swallowed and enters airways

UN GHS Rev.11, Annex 3, Table A3.1.2, PDF p. 304

US OSHA HCS

Same as UN

HCS 2024 · primarily GHS Rev.7, some Rev.8

May be fatal if swallowed and enters airways

29 CFR 1910.1200 App. C, matched by wording

EU CLP

Same as UN

EU_CLP_2025 · consolidated 1 Jul 2026

May be fatal if swallowed and enters airways.

EU CLP (Reg. (EC) No 1272/2008), Annex III, Part 1

Canada (EN)

Same as UN

WHMIS_2022 · GHS Rev.7 (Rev.8 for chemicals under pressure)

May be fatal if swallowed and enters airways

GHS Rev.7 Annex 3 Table A3.1

Canada (FR)

Adopted

WHMIS_2022 · SGH Rév.7, texte officiel

Peut être mortel en cas d’ingestion et de pénétration dans les voies respiratoires

GHS Rev.7 Annex 3 Table A3.1

Mexico (ES)

Adopted

NOM-018-STPS-2015 · GHS 5th revised edition

Puede ser mortal en caso de ingestión y de penetración en las vías respiratorias

Peligro por aspiración · 1

NOM-018-STPS-2015, DOF 9 October 2015, Apéndice C, Tabla C.2, PDF p. 31

Hazard classes and categories

Aspiration hazard (chapter 3.10) · Category 1

UN GHS Rev.11 Annex 3, sections 1 and 2

FRDanger par aspiration (chapitre 3.10) · catégorie 1

ESPeligro por aspiración · 1 (NOM-018-STPS-2015)

Pictogram: Health hazard (GHS08)

UN GHS Rev.11 Annex 3, section 3. Pictogram rules can differ by jurisdiction; see the GHS pictogram guide.

P statements in the UN GHS Rev.11 label matrix only

UN GHS Rev.11 only. EU CLP, US OSHA, Canada (GHS Rev.7) and Mexico assign different P statements; check the regulation for your market.

Aspiration hazard (chapter 3.10), categories 1, 2 (PDF p. 404)
P331 P405 P501 P301+P316

UN GHS Rev.11 Annex 3, section 3. Each table covers the categories named; a P statement may apply to only some of them. Many apply only under conditions; check the conditions for use before putting them on a label.

Related codes

H305

Change in UN GHS Rev.11

No change to the wording or the hazard classes in Annex 3 compared with Rev.10.

Sources

Each cell in the table names the official table and page for H304. Full citations, links and revision notes for UN GHS Rev.11, US OSHA, EU CLP, Canada and Mexico: Sources and revision notes.

These are regulatory phrases for labels and safety data sheets. Check them against the official source for your jurisdiction before use.