Air purifiers and allergies: what they can and cannot do
An air purifier for allergies can lower some airborne allergens. What trials measured, how small the effects were, and what usually matters more at home.
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Smoke, allergens, odors, mold and viruses
What a purifier can and cannot do about wildfire smoke, tobacco smoke, allergens, odors, VOCs, mold and airborne viruses, with the limits of the evidence stated plainly.
Air purifier for wildfire smoke: sizing, setup and limits
How to choose an air purifier for wildfire smoke: EPA and AHAM sizing, a clean room, running it on high, what carbon adds, and what the data does not show.