Clean Air Education

Clean Air Education is the honest, independent guide to clean air at home, office or in schools — no brand sponsors us, and we don't sell air purifiers.

We explain how air purifiers really work and how to choose one that actually cleans your air: what "HEPA" and the "99.97%" claim really mean, how to read CADR (Clean Air Delivery Rate), how to match a purifier to your room using air changes per hour (ACH), and when a cheap DIY Corsi-Rosenthal box beats an expensive machine.

You'll also learn about indoor air quality, PM2.5, filters (true HEPA vs HEPA-type, HEPA vs MERV), and how cleaner air helps with allergies, dust, pet dander, mould, hay fever, wildfire smoke and viruses.

Science-based and jargon-free. New videos weekly.

Free room-size calculator and full guides (with sources) at cleanair.app. Honest advice, nothing to sell — subscribe.