Air Wick Essential Mist: covers 400 square feet, which is most of a floor

The Air Wick Essential Mist Diffuser claims 400 square feet of coverage — enough for a decent-sized living room or open-plan kitchen area. It’s a simple number, but it means the diffuser can handle most standard rooms without needing a second unit. The coverage is about what you’d expect from a plug-in, just with the essential-oil twist instead of aerosol propellant.