Exclamation Mark

The Catch-All for Lower-Severity Health Hazards

GHS07 gathers the health hazards that are real but fall short of corrosion, lethality, or chronic disease: acute toxicity Category 4 by any route, skin irritation Category 2, eye irritation Category 2 (2A under the full GHS scheme), skin sensitization Category 1, and specific target organ toxicity single exposure Category 3, which covers respiratory tract irritation (H335) and narcotic effects such as drowsiness and dizziness (H336). GHS and CLP also assign it to substances hazardous to the ozone layer (H420).

That breadth makes GHS07 the most common pictogram in most workplaces — it sits on general-purpose cleaners, many paints and adhesives, common solvents like some glycol ethers, and countless mixtures. The risk is desensitization: because the symbol is everywhere, workers stop reading past it. The corrective is the same as for every GHS label — the H-statements distinguish a mild eye irritant (H319) from a skin sensitizer (H317) that can end someone's career in that trade through allergic dermatitis.

Always Warning, Never Danger

GHS07 is the only hazard pictogram whose classifications uniformly take the signal word Warning. Its characteristic hazard statements are H302, H312, and H332 (harmful if swallowed, in contact with skin, if inhaled) for acute toxicity Category 4; H315 (causes skin irritation); H319 (causes serious eye irritation); H317 (may cause an allergic skin reaction); H335 (may cause respiratory irritation); and H336 (may cause drowsiness or dizziness). H336 deserves particular respect in practice, since narcotic solvent effects impair judgment and coordination around machinery and at height.

Skin sensitization is the endpoint most often underestimated on GHS07 labels. Unlike irritation, sensitization is not dose-proportional in the ordinary sense: once a worker is sensitized to an epoxy amine hardener or a preservative like isothiazolinones, minute subsequent exposures trigger reactions. The classification carries preventive statements such as P261 and P272 (contaminated work clothing should not be allowed out of the workplace), which encode the fact that avoidance, not tolerance, is the only reliable control.

Precedence Rules: When GHS07 Must Disappear

GHS, OSHA HazCom 2012, and EU CLP all subordinate the exclamation mark to more severe pictograms covering the same ground. If the GHS06 skull and crossbones appears, GHS07 must not be used for acute toxicity. If the GHS05 corrosion pictogram appears, GHS07 must not be used for skin or eye irritation. And if the GHS08 silhouette appears for respiratory sensitization, GHS07 must not be used for skin sensitization or for skin and eye irritation. These rules exist to stop labels drowning severe warnings in redundant symbols.

GHS07 can still legitimately share a label with those pictograms when it flags a different hazard. A degreasing solvent might carry GHS08 for aspiration hazard alongside GHS07 for narcotic effects; a corrosive cleaner concentrate might show GHS05 for skin corrosion and GHS07 for acute oral toxicity Category 4. Checking which H-statement each pictogram anchors is the only way to decode a multi-symbol label correctly.

What the Exclamation Mark Is Not

The most damaging confusion is with GHS08. The exclamation mark means harmful or irritating effects that are generally acute and reversible; the health hazard silhouette means serious, often chronic outcomes such as cancer, reproductive harm, respiratory sensitization, or organ damage. A product wearing only GHS07 has not been classified for any of those long-term endpoints. Nor is GHS07 a general caution symbol like the ISO 7010 W001 yellow triangle — it appears only when a mixture or substance meets specific classification criteria under 29 CFR 1910.1200 or CLP (EC) No 1272/2008.

GHS07 replaced the old European orange-square symbols Xn (harmful) and Xi (irritant) when CLP superseded the Dangerous Substances Directive, and legacy stock bearing the St Andrew's cross still surfaces in older storerooms; those labels have been invalid in the EU since the CLP transition ended in 2017. There is also no transport counterpart: goods that are merely irritant or harmful generally travel unregulated for those endpoints, so GHS07 appears on supply labels without any matching diamond on the freight.

Reading the exclamation mark pictogram

The exclamation mark can communicate harmful acute toxicity, skin or eye irritation, skin sensitization, respiratory tract irritation, or narcotic effects in the applicable categories.

What to check alongside it

It is not a universal marker for all hazards. The skull, corrosion, and respiratory-sensitization pictograms take precedence for specified endpoints. Read the hazard statements to understand why the exclamation mark appears.