english: When sunlight comes in and strikes a photocatalyst, like TiO2, or titanium dioxide, it creates these really reactive oxygen species, like superoxides, hydrogen peroxide and hydroxyl radicals.
non_english: Kada se pojavi sunčeva svetlost i dosegne fotokatalizator, kao što je TiO2 ili titanijum-dioksid, on stvara veoma reaktivne vrste kiseonika poput superoksida, hidrogen-peroksida  ili hidroksil radikala.