How can outdoor air with high levels of ozone be treated?

• A. Gas phase filtration
• B. Activated carbon filters
• C. UV disinfection
• D. Dust collection

Answer: (A)

Ozone is a gaseous pollutant, so the way to reduce it in outdoor air is to treat the air’s gas phase rather than its particulates or microbes. Gas-phase filtration uses adsorbent media to capture gases as air passes through, and ozone is effectively removed by adsorption onto surfaces such as activated carbon. While activated carbon filters are a specific method within gas-phase filtration, the general approach described here is the appropriate category for removing a gas like ozone from the air.

Dust collection targets particulates and won’t reduce gaseous ozone. UV disinfection is designed for microbes and isn’t used to remove ozone from air. So the best-fit approach for high-ozone outdoor air is gas-phase filtration, with activated carbon as a common implementation.