How We Evaluate Air Purifiers
We evaluate air purifiers through research-based spec and certification analysis, not hands-on testing: we compare manufacturer specifications, AHAM Verifide CADR listings, CARB's certified-devices list, the underlying engineering (CADR by particle type, ACH math, filter class, noise-at-fan-speed), and aggregated owner-feedback themes. We do not physically test units, never publish prices or star ratings, always name at least one honest downside, and report only what a purifier is rated or certified to do — never a health outcome.
What "spec and certification analysis" means
- AHAM Verifide listings — the independently verified Smoke/Dust/Pollen CADR numbers for a specific model, versus a brand's own self-reported figures.
- CARB certification status — for ionizing/electronic models, whether the device appears on California's public certified-devices list, tested at or below the 0.050 ppm ozone ceiling.
- Manufacturer specifications — CADR, room-size rating, filter class (True HEPA vs "HEPA-type"), filter life in months, noise level by fan speed, and whether carbon and HEPA are separate or bonded into one cartridge.
- Aggregated owner-feedback themes — recurring praise and complaints (sensor reliability, noise, filter cost, build quality), described qualitatively, never reproduced as ratings or review counts.
Why we lead with CADR and certification, not the brand
The air-purifier category is dominated by content that repeats a big Pollen CADR number or slaps "HEPA" on a filter that's actually "HEPA-type" marketing with no verified threshold behind it. We compete where the answer is a citable fact those pages gloss over: which CADR number to size by, the AHAM 2/3 rule math, the True-HEPA-vs-HEPA-type distinction, the CARB ozone limit for ionizers, and the real annualized filter-cost math. If a category's marketing is mostly inflation, we say so.
Our compliance, honesty, and safety rules
- No prices, ever — we link to a live Amazon search so the price is always current.
- No star ratings or review counts — per Amazon's Operating Agreement.
- Always a downside — every pick names at least one honest drawback.
- Specification facts, not health claims — we state what a purifier is rated or certified to do; we never claim a unit prevents allergy symptoms or illness, and we route real respiratory concerns to a licensed physician or allergist.
- Marketing stats labeled as such — an inflated Pollen CADR, an unverified "HEPA-type" claim, or a self-reported ozone-free claim without CARB listing are flagged as manufacturer claims, not certified fact.
- Affiliate disclosure — as an Amazon Associate we earn from qualifying purchases, at no extra cost to you.
Methodology FAQ
No. We don't buy or lab-test units. Every recommendation is a research-based analysis built from manufacturer specifications, AHAM Verifide CADR listings, CARB's certified-devices list, and aggregated owner-feedback themes from public sources. We say this plainly so you can weigh our picks accordingly.
Prices change constantly and Amazon's own page is the only reliable source at the moment you buy. We link to a live Amazon search for each product instead. Amazon's Operating Agreement also restricts how affiliates display pricing.
We don't display them. Amazon's Operating Agreement restricts how Associates present ratings and review data, so we describe owner-feedback themes qualitatively — without reproducing review text or numeric scores.
Yes. Every product we recommend includes at least one honest, specific drawback — a narrower CADR than a competitor, a bonded filter that forces you to replace carbon media you didn't need yet, sensor reliability, or noise at higher fan speeds. A guide that only lists upsides isn't useful for a real decision.
No. We report specification and certification facts — CADR numbers, True HEPA vs 'HEPA-type' status, CARB ozone certification — not health outcomes. A CADR rating or HEPA certification tells you what a unit is measured to capture in a lab test, not that it prevents allergy symptoms or illness. For a specific respiratory or allergy concern, consult a licensed physician or allergist.