Pollution and Sunlight Synergistically Contribute to Skin Photodamage
Atmospheric pollution is a serious health concern in industrial countries. Particulate matters (PM) are considered highly deleterious as many carry toxic compounds such as polyaromatic hydrocarbons (PAHs). Ultrafine particles (less than 100 nm in size) or PAHs might either penetrate the stratum corneum (particularly of damaged skin) or translocate from lung to blood circulation and be distributed in living skin. Some PAHs are phototoxic: sun and pollution might thus synergistically compromise skin health as recent clinical data showed that pollution accelerates photo-aging.
This data demonstrates that pollution aggravates photo-damage and requires a specific protection strategy.