Which of the following is an example of airborne contaminants?

• A. Vapors
• B. Solids in the Air
• C. Noise
• D. Vapors, Fumes, Gases, Smoke, and Dust in the Air

Answer: (D)

Airborne contaminants are substances suspended in the air that people can inhale, including both gases/vapors and solid particles. The best example is the option that lists vapors, fumes, gases, smoke, and dust in the air because it covers the major forms these contaminants take in real settings. The other options are incomplete or not contaminants in this sense: vapors alone misses other important forms; solids in the air is too vague and doesn’t specify common airborne forms; noise is a physical hazard but not an airborne contaminant.