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Based on our data, you may be wondering: For cold and flu season, should I opt for an air purifier that works best at removing finer particles at low or high speed? According to Rubin, continuous low-speed operation is better for preventing illness because "it keeps background aerosol concentrations low at all times." Goldberg echoes this, adding that many manufacturers' operation guides recommend a continuous, low-speed mode for optimal performance. "High-speed bursts are only useful in addition to continuous use -- for example, immediately after someone coughs, sneezes or leaves the room --

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