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Electronic: Air cleaners that are listed as "Electronic" may be capable of generating small amounts of ozone, but have been tested and found to produce an ozone emission concentration less than 0.050 parts per million.

Mechanical: Air cleaners that are listed as "Mechanical" are those that only use physical filtration, such as pleated or HEPA-style filters, and do not generate ozone or ions.

The following terms relate to the type of air cleaning technology used by a device: CARB does not evaluate the effectiveness of air cleaners at removing pollutants. Please note that the list below does not reflect air cleaner effectiveness. The table below lists CARB-certified air cleaning devices, and is continuously updated as devices are approved. More information about California's Air Cleaner Regulation (AB 2276). Electronic air cleaners must also be tested for ozone emissions and meet an ozone emission concentration limit of 0.050 parts per million (50 ppb).

Since 2010, all portable indoor air cleaning devices sold to people or businesses in California are required to be certified by CARB. As of October 2020, electronic in-duct air cleaning devices are also subject to the regulation. To be certified, all air cleaners must be tested for electrical safety.