P284 · Precautionary statementIn case of inadequate ventilation wear respiratory protection.

Precautionary · PreventionHealthChanged in Rev.11

P284 is the GHS precautionary statement “In case of inadequate ventilation wear respiratory protection”. UN GHS Annex 3 assigns it to Acute toxicity, inhalation (chapter 3.1), Category 1, 2, 3 and Respiratory sensitization (chapter 3.4), Category 1, 1A, 1B. The English wording is the same as UN GHS Rev.11 in US OSHA, EU CLP and Canada. Canada’s official French text is “[Lorsque la ventilation du local est insuffisante] porter un équipement de protection respiratoire” and Mexico’s Spanish text is “En caso de ventilación insuficiente, llevar equipo de protección respiratoria”. In the UN GHS Rev.11 label matrix it is used with 3 hazard statements (UN only). Changed in UN GHS Rev.11: hazard classes/categories changed.

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

In case of inadequate ventilation wear respiratory protection.

UN GHS Rev.11, Annex 3, Table A3.2.2, PDF p. 321

US OSHA HCS

Same as UN

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

[In case of inadequate ventilation] wear respiratory protection.

29 CFR 1910.1200 App. C, matched by wording

EU CLP

Same as UN

EU_CLP_2025 · consolidated 1 Jul 2026

[In case of inadequate ventilation] wear respiratory protection.

EU CLP, Annex IV, Part 2

Canada (EN)

Same as UN

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

[In case of inadequate ventilation] wear respiratory protection.

GHS Rev.7 Annex 3 Table A3.2

Canada (FR)

Adopted

WHMIS_2022 · SGH Rév.7, texte officiel

[Lorsque la ventilation du local est insuffisante] porter un équipement de protection respiratoire.

GHS Rev.7 Annex 3 Table A3.2

Mexico (ES)

Adopted

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

En caso de ventilación insuficiente, llevar equipo de protección respiratoria

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
Respiratory sensitization (chapter 3.4) · Category 1, 1A, 1B

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 H334

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 on the safety data sheet what type of ventilation would be adequate for safe use and provide additional information with the chemical at the point of use that explains what type of respiratory equipment may also be needed.

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

Change in UN GHS Rev.11

Changed from Rev.10: hazard classes/categories changed.

Rev.10 only:

Acute toxicity, inhalation (chapter 3.1): 1, 2

Rev.11:

Acute toxicity, inhalation (chapter 3.1): 1, 2, 3

Sources

Each cell in the table names the official table and page for P284. 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.