SFFMA Firefighter I (FF1) HazMat Operations/Awareness Practice Test

Signal words on hazard labels convey how severe the hazard is. The word Warning indicates a moderate level of toxicity: it’s serious and requires precautions, but it isn’t the highest level of danger. In practice, this means exposure could cause harmful effects under normal conditions, so use appropriate protective measures and follow the label’s instructions. If a substance were extremely toxic, you’d see Danger instead; if it posed only a low hazard, a less urgent warning such as Caution or no signal would be used.