Purifier/ˈpjʊrɪfaɪər/ Definition 1 of 3Pro Tip 1/2Health Benefits Purifiers are often associated with better health by removing pollutants. Many hospitals use air purifiers for cleaner environments. Pro Tip 2/2Environmental Context Purifiers can be important in areas where air or water quality is poor. Due to the smog, urban areas see high sales of air purifiers.