Air purifier vs humidifier vs dehumidifier: three jobs
Air purifier vs humidifier vs dehumidifier: one filters particles, one adds moisture, one removes it. Which fits which complaint, with EPA's humidity limits.
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How air purifiers work and whether they help
What a portable air cleaner physically does, what the evidence shows, how to choose one, where to put it, how long to run it, and what to do before buying anything.
Do air purifiers work? What the evidence shows
Do air purifiers work? They measurably cut airborne particles in a room. Health results are smaller and mixed. What trials measured, found and did not show.
How to choose an air purifier: a step-by-step decision
How to choose an air purifier: name the problem, size CADR to the room, check the filter, noise at your real setting and ozone, and know when not to buy.
How do air purifiers work? Fan, filter and repeated passes
How do air purifiers work? A fan pulls room air through a filter and returns it, again and again. What each method removes, and what an air purifier cannot do.