Which forms of contamination include aerosols and vapor?

• A. Vapor, Liquid, Aerosol, Solid
• B. Gas, Liquid, Solid
• C. Aerosol and Liquid
• D. Vapor and Solid

Answer: (A)

Airborne forms of contamination include aerosols and vapor, which are two ways contaminants can travel through the air. Aerosols are tiny particles or droplets suspended in air, while vapor refers to a substance in the gaseous form that can disperse in air, especially when it’s derived from a liquid or solid at room temperature.

The full set of contamination forms typically recognized includes Vapor, Liquid, Aerosol, and Solid. The option that lists all four forms, thereby including both aerosols and vapor, is the best choice. The other options omit either aerosols or vapor (or both), so they don’t capture both airborne forms.