1 | The photosensitivity of film is one kind of photochemical action. | |
2 | This one was mainly due to oxygen molecules by ultraviolet sunlight of the role of the Gwanghwamun, the oxygen molecules into ozone. | |
3 | Photochemical smog: Smog produced by action of solar radiation, especially of ultraviolet radiation, on exhausts from vehicles and industry. |