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.
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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.
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.