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20 guides.
The Wave Enhance is Airthings' small, battery-powered monitor for bedrooms and offices. Unlike the old Wave Mini, it measures CO2 with an NDIR sensor. It does not measure radon or particles.
A nursery purifier should be quiet, dark at night, free of ozone-producing stages and placed where small hands cannot reach the cord. Here are the certified picks that tick those boxes.
A bedroom purifier has to clean the air on a speed you can sleep through. That means buying a size up, with a quiet low setting and lights that turn off.
CO2 tells you how well a room is ventilated. Only an NDIR sensor measures it directly. These monitors use one, and we explain what the readings mean for a bedroom or office.
Our top pick is the Vornado EVDC500: evaporative, so no white dust, with a 2-gallon capacity and a frugal DC motor. Here are six picks by room size and type.
One purifier that follows you, living room by day and bedroom by night, can beat two that sit still. These certified HEPA purifiers are light enough to carry and strong enough to matter.
The 411i Max is Blueair's small-room purifier: about the airflow of a Levoit Core 300, a quieter low setting, a particle sensor and app, and power draw lower than most lamps on its lowest speed.
The 200M is the version of Coway's Mighty that drops the ionizer. Same filters, same cheap yearly filter set, three manual speeds, and a sensor-driven Auto Mode.
The Mighty has been the reference mid-size purifier for a decade. It is still cheap to run, but it is no longer in AHAM's directory, it carries an ionizer, and Coway has a successor.
The AC4825 is one of the cheapest AHAM-listed towers, and its filters are cheap too. But its certified airflow fits a small bedroom, and its UV-C bulb adds upkeep without adding to the CADR.
The HCM-350 is a long-running evaporative bedroom humidifier with a dishwasher-safe tank. It needs a Filter A wick every 30 to 60 days, and Honeywell's own store now lists the white version as discontinued.
The HPA200 is the HPA300's smaller sibling: two R filters instead of three, 200 cfm of certified smoke CADR, simple buttons. Honeywell still sells it, but Amazon now lists only its filters.
The Classic 200 is a simple, quiet ultrasonic humidifier with a big tank for its size. Levoit still lists it on its own site, but it was not on Amazon US when we checked.
The Core 300-P is the small HEPA purifier most people start with. Its certified numbers fit a bedroom, not the 1,073 sq ft on the box, and its filters are cheap.
The MinusA2 is the purifier you can hang on a wall. It is quiet, slim and lets you pick a filter for pets, odors or toxins. Its smoke CADR is Rabbit Air's own and smaller than its price suggests.
Six air purifiers that earn their place on certified numbers: the right CADR for the room, sensible filter costs, and no marketing-only claims.
Dry air can irritate the nose and throat, and moister air can ease a stuffy nose. A clean cool mist humidifier at 40 to 50% helps; a dirty one or too much humidity makes things worse.
Put the monitor where people breathe, not where air blows. Breathing height, a few feet from windows, vents and the stove, and, for radon, EPA's lowest-lived-in-level rule.
A purifier's certified CADR is only reached if air can get in and out. Placement decides how much of that clean air reaches you. Here are the rules, in order of how much they matter.
Indoor CO2 is a ventilation gauge, not a toxin at normal home levels. A good NDIR monitor tells you when a bedroom or office needs fresh air. Here is how to read it.
