Ozone is a colourless, unstable and toxic gas with a pungent odour and powerful oxidizing properties.
Ozone differs from normal oxygen (o2) in having three atoms in its molecule (o3) and is also known as "trioxygen."
Ozone is formed from oxygen by electrical discharges or ultraviolet light by the reaction of sunlight on air containing hydrocarbons and nitrogen oxides.
Ozone decomposition by UV light leads to production of hydroxyl radicals and while this plays a part in the removal of hydrocarbons from the air it also creates peroxyacyl nitrates which are powerful irritants which compromise the skin.
Air pollution depletes the ozone layer in the atmosphere, allowing harmful UVA/UVB rays from the sun to affect your skin's layers, impairing its ability to repair itself.
Inhaled ozone has also been found to convert cholesterol in the blood stream to plaque (which causes hardening and narrowing of arteries). The powerful oxidizing properties of ozone may be a contributing factor of inflammation.
Although ozone was present at ground level before the Industrial Revolution, peak concentrations are now far higher than the pre-industrial levels, and even background concentrations well away from sources of pollution are substantially higher.
High frequency glass electrode beauty devices generate ozone.
Even low concentrations of ozone in air are very destructive. Exposure can produce headaches, burning eyes, and irritation to the respiratory passages.
Saccharomyces Ferment Filtrate Lysate is claimed to be especially protective against ozone. The ingredient is found in PCA Hydrating Serum, Replenix AE Dermal Restructuring Therapy PM, SkinMedica TNS Essential Serum and SPF 20.
"Ozone" originates from the middle nineteenth century from the German "ozon" from the Greek "ozein" meaning "to smell."
Also see atmospheric layers.
Ozone References
Tropospheric Ozone in EU - The consolidated report. European Environmental Agency. 1998.
Atmospheric Chemistry and Greenhouse Gases. Intergovernmental Panel on Climate Change.