Plain language
HEPA, CADR, and MERV in plain words.
Air purifiers, explained plainly
HEPA, CADR, costs, and ozone, sourced and linked.
Popular guides
What drives air purifier cost
Size, filters, energy, features.
HEPA filters, explained
What the 99.97% means.
CADR, explained
How to read the rating.
Ozone generators and ionizers
Why ozone is a health risk.
Air purifiers and wildfire smoke
Clean rooms and filters.
Air purifier filter replacement
When to change a filter.
Why use these guides
Sourced facts
From EPA, ENERGY STAR, AirNow, the Department of Energy, and the California Air Resources Board.
Health line on every guide
Every guide ends with the same health line.
No price tags or picks
We explain what drives cost. If we ever link to a retailer, we say so.
Before you plug one in
EPA says to avoid air cleaners that intentionally produce ozone.
