The area covered by an air purifier can vary. The bigger the room, the longer an air purifier takes to purify the air. The Dyson Pure Cool air purifier, purifies a room and automatically detects when the room is clean. It will also detect when pollution events begin using a Dyson development algorithm to keep indoor air quality in check. An air purifier is designed to efficiently work in a restricted space, hence it would work efficiently for a single room. The Dyson air purifiers are light and can be easily moved within rooms, if needed.