Air purifiers, like many other products (computers, monitors, copiers, ceiling fans, and more) have a normal "ozone byproduct." An acceptable level for ozone byproduct has been set in the Code of Federal Regulations (CFR) at a maximum 50 parts per billion (ppb). All air purifying devices must pass Underwriter Laboratories (UL) 867*.
In July 2013, Underwriter Laboratories conducted UL 867 testing procedures to determine the level of ozone byproduct generation by the PlasmaTrue™ bipolar ionizer used in AeraMax Pro purifiers. The highest level of ozone generation observed during testing was 4.0 ppb (acceptable level for ozone is up to 50.0 ppb).For reference, the Environmental Protection Agency developed the Air Quality Index for Ozone to give guidance to state and local air quality forecasters to assist in issuing Air Quality Index forecasts. The levels are:
Cities like Houston, TX and Los Angeles, CA can have indexes of 80 to 100 ppb at different times of the year. Note that AeraMax Personal units ship with PlasmaTrue ON; AeraMax Pro units ship with PlasmaTrue OFF. The PlasmaTrue™ feature can be turned off by pressing and holding the icon until the light turns off.* This standard for acceptable levels of ozone byproduct is found in section 21:801.415 of the Code of Federal Regulations (CFR) and Underwriters Laboratory (UL) standard 867.