Does Blueair's ionization process produce dangerous levels of ozone?

No. The most stringent government standards for indoor ozone are those of the Food and Drug Administration for indoor medical devices, which specify that ozone output be no more than .05 ppm. In a closed test room with the Blueair 501 in operation, probes measured ozone levels at .003 ppm-a tiny fraction of the amount deemed hazardous to human health. Our design safeguards against excessive ozone production, and then removes ambient ozone particles from the air.

Specifically, the Blueair 501 system was subjected to the Ozone Test outlined in section 37 of the Electrostatic Air Cleaner Standard, UL 867. The unit was positioned in the center of a closed 100 square foot room. The unit's ozone output was tested continuously throughout 24 hours of normal operation.

The official test results appear in graph form below. The graph shows a sharp decrease in ozone concentration while the Blueair 501 unit is operating, with ozone levels climbing again after the system is shut down.

The test demonstrates that HEPASilent™ filter technology reduces ozone in a sealed room.

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