Scientific American.com–Sunscreen runoff from beachgoers may already be altering coastal waters. Researchers have begun to focus on the environmental and health consequences of nanoparticles, tiny shreds of elements used in a range of commercial products. One of them is the impact of titanium dioxide (TiO2) nanoparticles used in sunscreens.
David Sánchez-Quiles, a doctoral candidate at the Mediterranean Institute for Advanced Studies in Spain, explained that nanoparticles of TiO2 act as ultraviolet light filters in sunscreens, but are often coated with silica or alumina to avoid undesirable reactions on the skin.
Read more on Scientific American.com: http://www.scientificamerican.com/article/sunscreen-floods-oceans-as-warmer-waters-boost-tourism/