Smart Air QT3 Portable Air Purifier

The QT3 is Smart Air's portable purifier, designed to go where the person goes rather than sit in one room. It targets hotel rooms, shared offices, study spaces and travel, where ventilation quality is outside your control and a full-size purifier is impractical. The company positions it as whisper-quiet, which is the deciding factor for a device meant to run beside a bed or a desk. Smart Air is a certified B Corp with an unusual approach to the category: it publishes open-source clean air research and runs clean air workshops, positioning itself against purifier marketing that relies on unverifiable claims. The QT3 uses a replaceable EPA filter, and Smart Air sells carbon and HEPA or EPA filters across its range including the Sqair, SA600, Blast Mini and Blast models.