The Air Police plug-in ionic purifier doesn't look like much. That's intentional — it's meant to disappear into a wall outlet and get on with the job. Ionic technology attracts and traps the airborne particles you can't see: dust, allergens, microscopic irritants that circulate until someone starts rubbing their eyes.

The filter is permanent stainless steel. When it's dirty, you wipe it clean. No subscriptions, no cartridges, no replacement costs. There's also a built-in nightlight with its own on/off switch — which is either a bonus or irrelevant depending on where you put it. Nurseries and bedrooms are the obvious spots.

Small footprint, continuous operation,Not glamorous. Effective.