air pollution containing ozone and other reactive compounds formed by the action of sunlight on nitrogen oxides and hydrocarbons, especially those in automobile exhaust.
photochemical smog n.
Air pollution produced by the action of sunlight on hydrocarbons, nitrogen oxides, and other pollutants.
[foh-toh-kem-uh-stree] /ˌfoʊ toʊˈkɛm ə stri/ noun 1. the branch of that deals with the chemical action of light. /ˌfəʊtəʊˈkɛmɪstrɪ/ noun 1. the branch of chemistry concerned with the chemical effects of light and other electromagnetic radiations Also called actinochemistry photochemistry pho·to·chem·is·try (fō’tō-kěm’ĭ-strē) n. The branch of chemistry that deals with the effects of light on […]
photochemotherapy pho·to·che·mo·ther·a·py (fō’tō-kē’mō-thěr’ə-pē, -kěm’ō-) n. See photoradiation.
[foh-tuh-kroh-mik] /ˌfoʊ təˈkroʊ mɪk/ adjective 1. (of chemically treated glass or plastic) capable of darkening or changing color when exposed to light. /ˌfəʊtəʊˈkrəʊmɪk/ adjective 1. (of glass) changing colour with the intensity of incident light, used, for example, in sunglasses that darken as the sunlight becomes brighter
- Photochromic lens
photochromic lens pho·to·chro·mic lens (fō’tə-krō’mĭk) n. A light-sensitive eyeglass lens that automatically darkens in sunlight and clears in reduced light.