California's CARB certification for air purifiers
CARB has established regulations to limit ozone emissions from indoor air purification equipment to protect public health. All air purification equipment sold in California (including those sold through the Internet) must comply with regulatory requirements.
According to this regulation, "indoor air purification equipment" is an energy consuming product that claims to reduce the concentration of pollutants in the air of enclosed spaces, including but not limited to allergens, microorganisms (such as bacteria, fungi, viruses, and other microorganisms), dust, particles, smoke, smoke, gases or vapors, and odorous chemicals. This type of equipment includes but is not limited to:
Portable equipment of any size used to purify the air near personnel, in any size of room, in the entire house or building, or in motor vehicles;
Design independent equipment for attachment to walls, ceilings, columns, or other indoor surfaces;
Electronic pipeline air purifier.
Since 2010, all portable indoor air purification equipment sold to individuals or businesses in California must obtain CARB certification. Starting from October 2020, air purification equipment inside electronic ducts must also comply with this regulation. To obtain certification, all air purifiers must undergo electrical safety testing. Electronic air purifiers must also undergo ozone emission testing and meet the ozone emission concentration limit of 0.050 ppm (50 ppb).
1. Requirements for product labeling after CARB certification:
Corresponding labels can only be affixed after passing CARB certification:

2. Air purifiers that have not been certified and are used for exempted industrial purposes:
According to the industrial use exemption outlined in section 94803 (a) of the regulation, manufacturers of uncertified ozone producing air purification equipment manufactured, supplied, offered for sale, introduced for commercial use, or sold to individuals or businesses in California must affix warning labels on such air purifiers for industrial use only:
For industrial use only Use only in unoccupied spaces Health hazard: Emits zone. '
3. Which air purifiers are exempted by California
“Industrial use” or “industrial application” means the use of ozone for the following purposes or conditions:
- Destruction of microbes on produce in an agricultural processing plant, refrigerated transport truck, or related facility, provided no people are physically present;
- Chemical oxidation and disinfection in the electronics, pharmaceutical, biotechnology and chemical industries, provided no people are physically present;
- Odor and smoke control in the hotel industry, for intermittent and temporary use, carried out by trained personnel, and provided no people are physically present;
- Mold, odor, fire and smoke damage remediation services, carried out by trained personnel, and provided no people are physically present;
- Odor control in the motor vehicle reconditioning and detailing industry, carried out by trained personnel, and provided no people are physically present;
- Odor control in mausoleums, carried out by trained personnel, and provided no people are physically present