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4 guides.
Filter-only purifiers do not make ozone. Ozone generators are designed to, and some ionizers and other electronic purifiers make it as a byproduct. Here is how to tell which is which.
For asthma, how a purifier cleans matters as much as how fast. We chose filter-only models listed as mechanical by California, sized to the room, with an option for smoke and odor gases.
Ionizers charge particles so they stick to surfaces or clump. They can also make ozone and other byproducts, and the evidence for some newer ion technologies is thin. Here is what is known.
IQAir's HealthPro Plus is the purifier hospitals and the cautious buy: heavy, well sealed, with a gas filter and a HEPA stage that lasts four years. IQAir also refuses to publish a CADR, which makes it hard to compare.
