If a purifier is used to improve air quality, what is its primary function?

• A. To remove dirt or harmful substances
• B. To sanitize surfaces
• C. To measure air quality
• D. To filter water

Answer: (A)

Air purifiers are designed to clean the air by capturing or destroying particles and pollutants as air moves through the device. Their primary function is to remove dirt or harmful substances from the circulating air, which lowers what you breathe and improves overall air quality. They typically use filters like HEPA to trap dust, pollen, smoke, and other particulates, and some models add activated carbon to absorb odors and gases. This differs from sanitizing surfaces (which cleans surfaces), measuring air quality (which uses monitors), or filtering water (which treats drinking water).