Compliance · California Air Resources Board
CARB Indoor Air Cleaning Device Regulation (17 CCR §94800–94810)
Indoor: ozone emitted by air cleaning devices (California)
The California Air Resources Board regulation on indoor air cleaning devices, 17 CCR §94800 et seq., limits the ozone that air cleaners may produce. Since 2010, any indoor air cleaning device manufactured for use, sold, or supplied in California must be certified by CARB to produce an ozone emission concentration not exceeding 0.050 ppm, tested under the regulation's procedure, and labeled accordingly. It covers ionizers, electrostatic precipitators, photocatalytic oxidation and UV devices, and corona discharge generators; intentional ozone generators marketed as air purifiers cannot be certified.
Limit values
CARB Air Cleaner Limit Values
Every value California Air Resources Board publishes for the parameter below, with its averaging period, as the standard states it.
Who it applies to
Who It Applies to
Manufacturers, distributors, and retailers of indoor air cleaning devices sold in or shipped to California, and indirectly every building owner choosing an air cleaner there. Certified devices are listed by CARB.
Monitoring
How Monitoring Relates to It
The limit is a certification test of the device, not an indoor air limit, so a room reading is not a compliance test. Measuring ozone in the space still shows whether an air cleaner, a printer, or outdoor infiltration is adding ozone, and whether indoor levels stay low against the occupational and indoor guidance values.
Recommended
best match-
Industrial monitor for indoor and outdoor sites. Built-in sensors cover the essentials, and hot-swappable gas sensor cartridges and a differential-pressure option add more.
Gas 1
Aethair O₃+NO₂
Ozone (O₃)Four-electrode electrochemical sensing measures oxidizing gases (ozone plus nitrogen dioxide) and reports one…
Gas 2
Free: one more gas sensor cartridge
MultiSense
Free: a MultiSense, stock or built to order
Expansion
Free: differential pressure
Also measures 14 more
Dew PointHeat IndexRelative HumidityIlluminance / LightParticle Count (by size)PM1PM10PM2.5Total PM / Mass Conc.Barometric PressureEquivalent Continuous Level (Leq)Sound Pressure Level (SPL)Air TemperatureNitrogen Dioxide (NO₂)
Who measures each parameter
| Parameter | Aethair PRO |  Aethair IAQ |  External |
|---|---|---|---|
| Ozone (O₃) | O₃+NO₂ cartridge | — | 1 instrument via Thiamis |
Devices
Devices That Cover CARB Air Cleaner
How much of this standard one Aethair monitor covers, followed by the third-party instruments in the sensor catalog that measure its parameters. Each connects to Environet through a Thiamis gateway, which adds whatever the monitor leaves out.
Aethair monitors
Covers it on its own
Solutions
Solutions Judged Against CARB Air Cleaner
Indoor Air Quality
Offices, schools, homes, and public buildings
Article Library
Articles on CARB Air Cleaner
Ozone Exposure Limits and Monitoring: OSHA and NAAQS
OSHA's ozone PEL is 0.1 ppm as an 8-hour TWA. How NIOSH, ACGIH, and the 70 ppb NAAQS compare, and why ozone needs short-interval monitoring.
Questions
CARB Air Cleaner FAQ
What ozone limit does CARB set for air cleaners?
An ozone emission concentration of no more than 0.050 ppm, verified by CARB certification testing before the device can be sold in California.
Which devices does the CARB regulation cover?
Indoor air cleaning devices including ionizers, electrostatic precipitators, photocatalytic oxidation and UV devices, and corona discharge generators.
Is the CARB limit an indoor air standard?
No. It is a device certification limit on emissions, not a limit on ozone in a room.
Monitor Against CARB Air Cleaner
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