
PuroAir 400
The review
The PuroAir 400 is CARB certified — confirmed in California's official Air Resources Board records — meaning it meets strict safety standards and produces no harmful ozone. PuroAir's testing in an ISO 17025 certified lab backs up the 2,000 sq ft room coverage, giving you independent evidence that the filtration performs as described. The 3-layer system — pre-filter, HEPA, and activated carbon — targets dust, pollen, pet dander, smoke, and VOCs, making it a strong all-round choice for allergy and asthma sufferers. The built-in PuroIQ sensor adjusts fan speed automatically, so the purifier works harder when air quality drops.
- CARB certified — confirmed in official California Air Resources Board records
- Independently tested in an ISO 17025 certified lab, according to PuroAir
- 3-layer filtration: pre-filter, HEPA, and activated carbon for pollen, dander, smoke and VOCs
- PuroIQ auto-mode sensor responds to real-time air quality
Good to know: For a smaller room with Wi-Fi app control, the approved #2 PuroAir 130i is worth a look.
Its certifications and quality standards
- Ozone-safe: CARB certified
Ozone irritates lungs. A CARB-certified purifier is safe to run all day in bedrooms and nurseries, and around children, pets and asthma.
See the official record
CARB list: PuroAir, Air Purifier, model PA400, Mechanical, certified 2023-02-10, ref G-23-044. The listing's part number is PA400.
ww2.arb.ca.gov ↗ - Independently tested: Third-party lab tested · stated by PuroAir
An extra layer of quality control: someone other than the maker checks what's inside.
Where PuroAir states it
Listing: 'Based on independent testing in an ISO 17025 certified lab';
getpuroair.com ↗ - Clean safety record
No recalls or official warnings for this product in the US CPSC's recall database ↗. Checked October 2026.



