Which statement reflects a visual indicator of hazardous materials?

Which statement reflects a visual indicator of hazardous materials?

• A. Mist, colored smoke, vapor clouds, fires, leaking containers, or spilled liquids.
• B. Hissing noises.
• C. A noticeable odor.
• D. Temperature change.

Answer: (A)

Visual indicators are signs you can see that reveal hazardous materials may be present. Mist or colored smoke, vapor clouds, fires, leaking containers, or spilled liquids are all visible cues of a release or exposure, so they let you recognize the hazard at a distance and take protective action quickly. In contrast, hissing sounds are something you hear, a noticeable odor is something you smell, and a temperature change is something you feel; none of these are visual, and odors can be faint or absent for many chemicals. So the most reliable visual signs are those you can observe with the eyes: mist, colored smoke, vapor clouds, fires, leaks, and spills.

Visual indicators are signs you can see that reveal hazardous materials may be present. Mist or colored smoke, vapor clouds, fires, leaking containers, or spilled liquids are all visible cues of a release or exposure, so they let you recognize the hazard at a distance and take protective action quickly. In contrast, hissing sounds are something you hear, a noticeable odor is something you smell, and a temperature change is something you feel; none of these are visual, and odors can be faint or absent for many chemicals. So the most reliable visual signs are those you can observe with the eyes: mist, colored smoke, vapor clouds, fires, leaks, and spills.