Ozone (O3)

Ozone (O3) consists of three oxygen atoms. In nature, it is created when ultraviolet (UV) light from the sun breaks down the oxygen molecule into two single oxygen atoms which quickly attaches itself to another oxygen molecule (O2) to become ozone, Ozone is also created electrically in nature during active thunderstorms. The electrical discharge, just like UV light creates ozone which gives that sweet smell we understand as clean fresh air.

Although Ozone (O3) is produced in nature to cleanse the environment, the benefits of Ozone (O3) in an indoor environment has to be controlled and ambient levels similar to the levels in nature.

Most countries adopt the OSHA standard for Industries and 50ppb for indoor air quality requirements confined to rooms, hospitals, nursing homes, offices etc. The maximum ozone exposure limit of 50 ppb is also adopted by ASHRAE for IAQ requirements.

In ambient levels of up to 70 ppb similar to levels in nature, ozone is effective in reducing VOCs, mould, airborne and surface bound bacteria and viruses. However, sensitivity to ozone is dependent on every individual. More sensitive individuals might experience throat dryness, headache, nausea, and shortness of breath.

Those who are sensitive to ozone may start to experience allergies, nausea, headache or dryness of throat.

High levels of ozone may increase risk of getting certain lung diseases and lung damage for all demographics. Breathing levels of Ozone (O3) higher than 70 ppb can trigger a variety of health problems, particularly for children, the elderly, and people of all ages who lung diseases such as asthma.

SOURCE: US EPA

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