Careless manufacturing and reckless use of nano particle anything could be trouble in the future. But don't worry nothing will happen for 10 or more years
All ready being noted. Not 10 years down the track. Sunscreens as a Source of Hydrogen Peroxide Production in Coastal Waters
Conservative estimates for a Mediterranean beach reveal that tourism activities during a summer day may release on the order of 4 kg of TiO2 nanoparticles to the water and produce an increment in the concentration of H2O2 of 270 nM/day. Our results, together with the data provided by tourism records in the Mediterranean, point to TiO2 nanoparticles as the major oxidizing agent entering coastal waters, with direct ecological consequences on the ecosystem.