Traffic
Traffic: room size, particles and the noise question
The searches worth having name a space or a problem. A purifier for a bedroom, for a nursery, for a large open-plan room, for a smoker's flat, for wildfire smoke, for cat allergens, for a workshop. Underneath sits a technical stream about clean air delivery rates, air changes per hour and what a filtration rating means. Noise is the third and most underserved, because a machine that cannot run in a bedroom overnight is useless to a large part of the audience. A brand that publishes coverage areas, air change figures and measured sound levels per fan speed can answer all three, and almost nobody does.
