Ecozone Technologies Ltd.

Super ActivO - Ozone Generators for Residual Ozone - Air and Climate - Air Pollution Treatment

This Super ActivO application note answers the question as to why the ‘slight smell of ozone’ may sometimes be present after the Super ActivO has completed its operation which includes ozone removal.

The ActivO Ozone Removal Process

  1. The Super ActivO uses the operator’s input ( the first button he pushes on the ActivO control panel telling the Super ActivO how large the enclosed room is that the Super ActivO is treating ) to calculate how long to draw air through the Super ActivO’s catalytic converter after the ozone generation cycle is completed. The Super ActivO draws three times the volume of air in the enclosed room through its catalytic converter.
  2. Each time the volume of air in the room is draw through the Super ActivO’s catalytic converter more than 90% of the ozone in the air is removed.
  3. Since the Super ActivO draws all the air in the room through its catalytic converter three times, the initial amount of ozone in the room is reduced to 0.1*0.1*0.1, or to about 0.1% of its initial concentration. As a result the ozone remaining in the room is less than the applicable safety standards require.
  4. For reference, the safe level of ozone is between 0.08 and 0.10 ppm:

    EPA
    : environmental protection agency (EPA) national ambient air quality standard for ozone is a maximum 8 hour average concentration of 0.08 ppm.

    OSHA
    : the occupational safety and health administration (OSHA) requires that workers not be exposed to an average concentration of more than 0.10 ppm for 8 hours.

    NIOSH
    : the national institute of occupational safety and health (NIOSH) recommends an upper limit of 0.10ppm, not to be exceeded at any time.

The ability of the operator to smell ozone

A human being can smell ozone down to a concentration of about 0.001 ppm, or 80 to 100 times less than the minimum allowed concentration of ozone in the treated space.
Hence the Super ActivO will produce a treated volume with residual ozone concentration well within the level permitted by the standards, and yet which can sometimes still be “slightly detected” by the Super ActivO operator.