Our skin is exposed to a large variety of pollutants in an ever more urbanised world. These include nitrogen oxides, particulate matter, hydrocarbons and other toxic compounds every day. Throughout the day, these pollutants accumulate on the skin’s surface and create oxidative stress that weakens the skin barrier. The consequence is dehydration, redness, imperfections, a grey and dull complexion, and, in the long term, accelerated skin ageing as well as increasingly visible dark spots.