What you need to know about Pyure devices and ozone
Pyure Portable, In-Duct and Wall-Mounted products are engineered to produce safe levels of total oxidants (including ozone) when operating guidelines are followed. Pyure custom solutions continuously monitor and control oxidant production through the use of electrochemical sensors.
Pyure sets the total oxidant (ozone + other organic oxidants) limit for its portable, In-Duct and Wall-Mounted devices at 50 parts per billion for three reasons:
The limit for continuous, 8-hour exposure to ozone is 100 parts per billion, according to OSHA
At these safe levels, Pyure has proven that the hydroxyls and organic oxidants produced kill pathogens and neutralize VOC
At these safe levels, ozone has no effect on VOC or pathogens
Pyure does not provide operating guidelines for its custom solutions because they have interactive process controls that ensure ozone levels are always safe and organic oxidant levels are always effective.
Note that indoor ozone levels alone are not an accurate measure of hydroxyl production because they are a blend of ozone generated from the Pyure device and ozone introduced from outdoors. In urban areas, ambient ozone levels can exceed the limit set for the Pyure device. In these circumstances, end users should consult Pyure specialists to determine the appropriate operating conditions and limits to set on custom solutions.
Because Pyure devices produce ozone at a constant rate, and ozone is very slow to react with VOC, it is sometimes falsely assumed that ozone levels will progressively build up in a treated space over time and reach unsafe levels if the device is operated continuously.
There are two reasons for this plateau:
Numerous Pyure studies have demonstrated that ozone levels reach a steady state plateau where ozone levels no longer increase, even in the absence of any ventilation. This is because ozone loss modes due to surface deposition are high and continuous. Air exchange will further reduce ozone levels. Ozone losses due to adsorption occur when ozone comes into contact with carpets, furniture, painted surfaces, floor and ceiling tiles, clothing, and other materials. This ozone loss mode is continuous at a rate proportional to the total surface area within the treated space. For each Pyure device in a room of sufficient size, the production rate and loss rate will be equal, resulting in a plateau where ozone levels no longer increase.