Which hazard does not correspond with the Skull and Crossbones pictogram?

The Skull and Crossbones pictogram is used to signify toxicity and indicates that a substance is either fatal or acutely toxic. When it appears on labels or safety data sheets, it usually denotes that exposure to the material can result in serious health consequences, including death.

Very low toxicity does not align with this pictogram because substances with very low toxicity are not expected to cause serious harm, unlike those that are categorized as fatal or toxic. Therefore, the use of the Skull and Crossbones symbol would be misleading if it were applied to a substance with very low toxicity.

Other options, such as fatal toxicity, toxic substances, and severe health hazard, are all related to serious health effects and fit the criteria for the Skull and Crossbones pictogram, highlighting potential life-threatening dangers associated with those materials.