2018.04.24
Light pollution is a new kind of environmental pollution source after exhaust gas, waste water, waste residue and noise pollution, mainly including white pollution, artificial day pollution and color pollution. Light pollution is threatening people's health. White pollution in the city's bustling streets, many shops decorated with large mirrors or aluminum alloy facades, and some even from the roof to the bottom of the whole mirror decoration, people almost in a mirror world, and can not tell the direction. In the season of strong sunlight, the tempered glass, glazed brick walls, aluminum alloy panels, polished granite, marble and high-grade paint decoration, bright, white flowers, dazzling. According to the measurement, the reflection coefficient of the white painted surface is 69-80%, while that of the mirror glass is 82-90%, which is about 10 times larger than that of the buildings decorated with green grassland, forest, dark or furry masonry. It is far beyond the human body's ability to bear, thus becoming one of the new pollution sources in modern cities. White pollution can damage the clear cornea and iris of the eye, cause vision loss and increase the incidence of cataracts. When night falls, billboards and neon lights on hotels and shopping malls dazzle people. Some of the strong beams of light shoot into the sky, making the night like day. Artificial daytime also has adverse effects on people's physical and mental health. Because of the strong light reflection, the nearby room can be illuminated like daylight, making it difficult to sleep at night, disrupting the normal biological rhythm, resulting in mental depression. According to a survey conducted abroad, two-thirds of the people believe that artificial daytime affects their health, and 84% of the people report that it affects their sleep at night. To avoid glare, people have to close their bedroom windows or install dark curtains. Artificial daylight can also harm insects and birds, because intense light can disrupt the normal reproductive process of nocturnal insects. At the same time, insects and birds can be burned by intense heat. Colored light pollutes the black light, rotating light, fluorescent light and flashing color light sources installed in modern dance halls, which constitute colored light pollution and endanger human health. It has been determined that black light can produce ultraviolet rays with wavelengths ranging from 250 to 320 nm, and its intensity is much higher than that of ultraviolet rays in sunlight. If the human body is exposed to such black light for a long time, it may induce epistaxis, tooth loss, cataract, and even leukemia and cancer. The harmful effects of ultraviolet radiation on human body can last 15~25 years.
Rotating light and color light source, dazzling, not only to the eyes, but also can interfere with the central nervous system of the brain, make people feel dizzy, stand unstable, headache, insomnia, inattention, loss of appetite and other symptoms. In addition to impairing people's visual function, the flashing lights of neon lights in dance halls can also disturb the internal balance of the human body, making temperature, heartbeat, pulse, blood pressure become incoordinate, causing dizziness, restlessness, loss of appetite and insomnia and other light-damage syndrome. Too long irradiation time of fluorescent lamp will reduce the calcium absorption ability of human body and cause calcium deficiency. Now there are some luxurious dance halls equipped with laser devices. According to the investigation and measurement of laser equipment in dozens of dance halls by relevant health departments, the laser radiation pressure of most dance halls has exceeded the limit value. When this dense thermal beam of light passes through the lens of the eye and focuses again on the retina, the point of focus can reach 70 degrees Celsius, which is very harmful to the eyes and brain nerves. It can not only lead to visual impairment, but also make people appear headache, dizziness, cold sweat, neurasthenia, insomnia and other diseases of the central nervous system. Scientists have recently shown that color pollution not only harms people's physiological functions, but also affects people's psychology. "Spectrophotometric effect" measurement showed that if the psychological effect of white light was 100, blue light was 152, purple light was 155, red light was 158, black light was the highest, 187. If people are exposed to colored lights for a long time, their psychological accumulation effect, will also cause varying degrees of burnout, dizziness, loss of libido, impotence, menstrual disorders, neurasthenia and other physical and mental disorders.
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