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 ioniser used in AeraMax Professional 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:
0 – 50 ppb: Good
51 – 100 ppb: Moderate
101 – 150 ppb: Unhealthy for Sensitive Groups
151 – 200 ppb: Unhealthy
201 – 300 ppb: Very unhealthy
Cities like Houston, TX and Los Angeles, CA can have indexes of 80 to 100 ppb at different times of the year.
The PlasmaTRUE™ feature can be turned 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.