CARB is the abbreviation of "California Air Resources Board". On April 27, 2007, CARB held a public hearing based on the investigation and approved the "Airborne Toxic Control Measure (ATCM)" "To reduce the amount of formaldehyde emitted from wood products.

The California Air Resources Board (CARB) approved the formulation of the “Airborne Toxic Control Measure” (ATCM) to strictly limit the amount of formaldehyde released from wood-based panels and their products. ATCM uses favorable control technology or more effective control methods to protect people's health, and implements strict formaldehyde emission standards in the wood-based panel and its products industry. The standard came into effect on January 1, 2009.

Composite wood products sold, supplied, sold, supplied, used, and manufactured in California, and finished products containing composite wood products.

All air purifiers with the function of removing formaldehyde.

CARB certification services include the following:

Manufacturer: Anyone who manufactures or produces composite wood products. (Concurrently: manufacturing, sales, supply and marketing or supply)

Importer: A person or entity that sells or resells composite wood products or their finished products produced outside the United States in California.

Processor: Anyone who uses composite wood products to make finished products; includes manufacturers of laminated products.

Distributor: Any person who sells or supplies composite wood products or finished products for resale or commercial distribution purposes, but manufacturers and retailers are not distributors.

Retailer: An individual or entity that directly sells, supplies, or supplies composite wood products or finished products containing composite wood products to consumers.

Excluding EXEMPTIONS: (1) Composite wood products sold, supplied, sold, supplied, used, manufactured and sold outside of California, and finished products containing composite wood products. (2) Comply with the requirements of hardwood plywood (HWPW) and particle board (PB) in 24CFR 3280.308 for use in mobile houses, which are 0.2ppm and 0.3ppm respectively.

The ozone emission concentration does not exceed 0.050 parts per million (ppm). Air purifiers that have passed CARB certification must be marked "Meets California ozone emissions limits. CARB certified." on the product label.