Basic definition of light pollution

Light pollution refers to the pollution caused by dry light to the environment. Dry light is an environmental pollutant.

Light pollution in a broad sense includes things that may have adverse effects on people's visual environment and physical health, including the reflections from common books and papers in daily life, wall paints and even the "glow" of colorful roadside advertisements. It can also be included in this list, which shows the wide range of light pollution. In daily life, common light pollution conditions are mostly the dizziness of pedestrians and drivers caused by reflections from mirrored buildings, as well as the discomfort caused by unreasonable lighting at night to the human body.

Internationally, light pollution is generally divided into three categories, namely white light pollution, artificial daylight pollution and colored light pollution.

1. White pollution: White pollution means that when the sunlight is strong, the glass curtain walls, glazed brick walls, polished marble and various paints and other decorations of buildings in the city reflect light, making them bright and dazzling. Eye-catching. Expert studies have found that people who work and live in a polluted environment with white light for a long time will suffer varying degrees of damage to the retina and iris, and their vision will drop sharply. The incidence of cataracts is as high as 45%. It will also make people dizzy, upset, and even cause insomnia, Symptoms similar to neurasthenia include decreased appetite, depressed mood, and physical weakness.

2. Artificial daylight: After nightfall, the advertising lights and neon lights on shopping malls and hotels are dazzling and dazzling. Some strong beams of light even reach into the sky, making the night look like daytime, which is the so-called artificial daylight. In the urban "city that never sleeps", people have difficulty falling asleep at night, which disrupts the body's normal biological clock and leads to low work efficiency during the day. Artificial daylight can also harm birds and insects; strong light may disrupt the normal reproduction process of insects at night.

3. Colored light pollution: Black lights, rotating lights, fluorescent lights and flashing colored light sources installed in dance halls and nightclubs constitute colored light pollution. According to measurements, the intensity of ultraviolet rays produced by black lights in nightclubs and dance halls is much brighter than the ultraviolet rays in sunlight, and its harmful effects on the human body last for a long time. If people are exposed to this kind of exposure for a long time, it can induce nosebleeds, tooth loss, and cataracts. , and even lead to leukemia and other cancers. Colored light sources dazzle people, which are not only harmful to the eyes, but also interfere with the central nervous system of the brain, making people feel dizzy, nausea, vomiting, insomnia and other symptoms. Scientists' latest research shows that colored light pollution not only damages people's physiological functions, but also affects mental health.