CLP HAZARD PICTOGRAMS Match pictogram with their meaning. Oxidizing Explosive Flammable Corrosive Hazardous to the environment Acute toxicity You’ll see that the old 'harmful/irritant' symbol is missing. This has been replaced by the exclamation mark pictogram: Health hazard/Hazardous to the ozone layer (Symbol: Exclamation mark) A couple of new pictograms have also been introduced: Serious health hazard (Symbol: health hazard) Gas under pressure (Symbol: Gas cylinder)