P271 · Precautionary statementUse only outdoors or with adequate ventilation.

Precautionary · PreventionHealthDiffers: US, EU, Canada

P271 is the GHS precautionary statement “Use only outdoors or with adequate ventilation”. UN GHS Annex 3 assigns it to 4 hazard classes. The wording differs in US OSHA, EU CLP and Canada. Canada’s official French text is “Utiliser seulement en plein air ou dans un endroit bien ventilé” and Mexico’s Spanish text is “Utilizar sólo al aire libre o en un lugar bien ventilado”. In the UN GHS Rev.11 label matrix it is used with 6 hazard statements (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

Use only outdoors or with adequate ventilation.

UN GHS Rev.11, Annex 3, Table A3.2.2, PDF p. 319

US OSHA HCS

Differs

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

Use only outdoors or in a well-ventilated area.

29 CFR 1910.1200 App. C, matched by wording

EU CLP

Differs

EU_CLP_2025 · consolidated 1 Jul 2026

Use only outdoors or in a well-ventilated area.

EU CLP, Annex IV, Part 2

Canada (EN)

Differs

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

Use only outdoors or in a well-ventilated area.

GHS Rev.7 Annex 3 Table A3.2

Canada (FR)

Adopted

WHMIS_2022 · SGH Rév.7, texte officiel

Utiliser seulement en plein air ou dans un endroit bien ventilé.

GHS Rev.7 Annex 3 Table A3.2

Mexico (ES)

Adopted

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

Utilizar sólo al aire libre o en un lugar bien ventilado

NOM-018-STPS-2015, DOF 9 October 2015, Apéndice D, Tabla D.1, PDF p. 35

Hazard classes and categories

Acute toxicity, inhalation (chapter 3.1) · Category 1, 2, 3, 4
Respiratory sensitization (chapter 3.4) · Category 1, 1A, 1B
Specific target organ toxicity, single exposure; respiratory tract irritation (chapter 3.8) · Category 3
Specific target organ toxicity, single exposure; narcotic effects (chapter 3.8) · Category 3

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

H statements it is used with 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 their own P statements; check the regulation for your market.

H330 H331 H332 H334 H335 H336

UN GHS Rev.11 Annex 3, section 3. Listed for at least one category that uses each H statement.

Conditions for use

Manufacturer/supplier to specify what type of ventilation would be adequate for safe use on the safety data sheet and in any supplemental safety instructions provided to consumers.

Quoted as published in UN GHS Rev.11 Annex 3, section 2. List markers are shown as bullets.

Change in UN GHS Rev.11

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

Notes

EU CLP wording differs from UN GHS Rev.11.

Sources

Each cell in the table names the official table and page for P271. 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.