Charcoal filters are used for what purpose?

• A. Water purification
• B. Sound damping
• C. Air
• D. Light filtration

Answer: (C)

Activated charcoal works because its activated carbon has an extremely porous structure with a very large surface area, which makes it excellent at adsorbing molecules from gases. This allows it to capture odors, volatile organic compounds, and other airborne contaminants as air passes through the filter. That’s why charcoal filters are commonly used in air filtration devices, respirators, and other applications aimed at cleaning the air you breathe. While activated charcoal can remove some substances from water too, the most typical use described here is purifying air. They aren’t used for damping sound or filtering light, which rely on different materials and mechanisms.