Without light, there would be no color, and everything in the world would be dark. For human beings, light is as indispensable as air, water and food. The eyes are the most important sense organs of the human body, the human eye has a strong ability to adapt to the light, the pupil can be adjusted with the brightness of the environment. However, if you look at things in low light for a long time, your eyesight will be damaged. On the contrary, strong light can make the human eye instant blindness, or cause permanent damage. People must work, study and live in a suitable light environment. On the other hand, human activities may cause damage to the surrounding light environment, so that the original suitable straight light environment becomes uncomfortable straight, which is light pollution. Light pollution is a special form of pollution, which includes visible light, laser, infrared and ultraviolet light pollution. Visible light pollution is more common is glare. For example, whenever you walk along the road at night, the oncoming headlights of motor vehicles shake the pedestrians so that they can not open their eyes, which is a kind of light pollution, called glare. This dazzling light source is not only common on the road, in some industrial and mining enterprises are often seen. Such as in the melting, smelting and welding process, very strong light is also harmful light pollution. Visible light pollution is more dangerous is the explosion of nuclear weapons glare. It can cause eye damage to a considerable range of people. If there is no appropriate protective measures, long-term welding, smelting and melting glass and other work, the eyes will be harmed, blind spots in the eyes, to the old easily suffer from cataracts, which is the result of strong light damage to the lens of the eye. Modern urban light pollution with the increasing development of modern cities and prosperity, a new urban light pollution is threatening human health. This new urban light pollution is: urban, downtown shopping malls, companies, office buildings, restaurants, hotels, restaurants; hair salons and dance halls, etc. are using large pieces of mirrored glass, stainless steel panels and aluminum alloy doors and windows decorated. Some even from the neck item to the bottom of all with mirror glass mounted clear, so that people seem to be in the world of mirrors, the direction is difficult to defend, and thus accidents. After sunset, nightfall, the city's busy streets on a variety of billboards, neon lights, waterfall lights and so on are lit up, colorful, so that people fork in the artificial daytime. Into the modern ballroom, people for the pursuit of stimulation, often using "color light source", "sunshine light source", "rotating light source", etc., dazzling. For these sources of light pollution, domestic and foreign scientists believe that urban light pollution can seriously interfere with people's nervous system, so that the normal visual activities of people affected. In the season of strong sunlight, the building's mirror glass, glazed tiles, stainless steel, aluminum alloy plate, polished granite, marble and high-level coating poles and other decorative, bright, since the flowers, dazzling pharyngeal forced people. According to scientific determination, the light reflection coefficient of these decorative materials are more than 69%, and even up to 90% demolition, than green areas, forests, dark or hairy masonry outside the decorative building reflection coefficient is about 10 times larger than the human body can withstand the limit, and lead to dizziness, headache, nervousness, inattention, annoyed manipulation of palpitations, insomnia, loss of appetite, fatigue, and other discomforts, and will also Induce photosensitive dermatitis, harm the human cornea and iris, bow l up vision loss. Artificial since the Qui on the physical and mental health of people can not be ignored, reflecting light into the room, destroying people's circadian rhythms, making it difficult to sleep, and even lead to insomnia and neurasthenia, resulting in sleepiness, easy to go to work, accidents and other safety aspects. Laser pollution laser is issued by the laser a special light, it's a single color, light Harvest straight, great intensity. At present, the laser has thousands of colors, has many advantages, and has been widely used. But because of the laser's energy concentration, high brightness, so more harm than other light. Laser energy such as continuously issued, the maximum power up to tens of thousands of kilowatts, the instantaneous power up to trillions of kilowatts, children's seconds can be a thick steel plate through, not to mention people. Therefore, the laser fork is known as dead light. Laser environmental pollution caused by two aspects: is the laser beam through the air so that many substances (such as dust) gasification, resulting in atmospheric pollution; on the other hand, the laser will not only harm the eye's conjunctiva, iris and lens, but also may be directly harmful to the human body's deep tissues and nervous system. At present, lasers are mainly used in laser industry (cutting, punching, etc.), mapping, medical treatment and scientific research. Infrared pollution infrared in the military, artificial satellites, as well as industry, agriculture, health research and other aspects have a wide range of applications. Infrared pollution can not be ignored. Infrared is a kind of invisible light, its main role is the role of heat, stronger infrared light irradiation of the human body, can cause skin damage, skin burns similar to scalding. Infrared rays are likewise injurious to the human eye; they can harm the retina at the bottom of the eye, and may also cause corneal burns and iris injuries. Ultraviolet Pollution Ultraviolet light is also a type of invisible light, which has a wide range of applications in production, defense, and medicine. For example, disinfection, sterilization, treatment of certain skin diseases and chondromalacia, etc. It is also used in the detection of artificial satellites on the ground. But the harm of ultraviolet light on the human body, mainly harm to the human eyes and skin, long-term excessive exposure to ultraviolet light, will make the cornea of the eye cornea show cornea from the rabbit injury, will make the skin appear "light dermatitis, in serious cases, will make the skin peeling necrosis, and even cause skin cancer. The role of ultraviolet light to harm the skin is also a kind of light pollution.
What is light pollution?
Light pollution is a new source of environmental pollution following the pollution of waste gas, waste water, waste and noise, mainly including white light pollution, artificial daytime pollution and colored light pollution. Light pollution is threatening people's health.
White light pollution in the city's busy streets, many stores with large mirrors or aluminum alloy decorative facade, and some even from the roof to the ground floor of the whole with a mirror decorative, people are almost in a mirror of the world, and can not distinguish the direction. In the season of strong sunlight, the building's tempered glass, glazed brick walls, aluminum alloy plates, polished granite, marble and high-level paint and other decorative, bright, white, dazzling forced. It has been determined that the white stucco surface reflection coefficient of 69 ~ 80%, while the reflection coefficient of the mirror glass up to 82 ~ 90%, than the green grass, forests, dark or hairy masonry decoration of the building's reflection coefficient of about 10 times larger than the human body can withstand, thus becoming one of the new sources of pollution in modern cities. White bright pollution can harm the cornea and iris of people's eyes, causing vision loss and increasing the incidence of cataracts.
Artificial Daylight Pollution When night falls, billboards and neon lights on big hotels and shopping malls dazzle people, and some of the strong beams of light even go straight up to the sky, making the night like daytime. Artificial daytime also has a negative impact on people's physical and mental health. Due to the reflection of the light, the neighborhood can be illuminated as daytime, making it difficult to sleep at night, disrupting the normal biological rhythms, leading to mental instability. According to a survey abroad, two-thirds of the people believe that artificial daylight affects health, 84% of people reflect the impact of night sleep. In order to avoid glare, people have to close their bedroom windows or install dark curtains. Artificial daylight can also harm insects and birds, as the bright light can disrupt the normal reproductive processes of nocturnal insects. At the same time, insects and birds can be burned to death by the high temperatures surrounding the bright light.
Color light pollution modern cabaret installed black lights, rotating lights, fluorescent lamps and flashing colored light source constitutes a color light pollution, hazardous to human health. It is determined that the black light can produce wavelengths of 250 ~ 320 nanometers of ultraviolet light, its intensity is much higher than the sun's ultraviolet light, the human body, such as long-term exposure to this black light irradiation, may be induced by nosebleeds, loss of teeth, cataracts, and even lead to leukemia and cancer. The harmful effects of this ultraviolet light on the human body can last 15 to 25 years. Rotating moving lights and colored light sources, dazzling, not only for the eyes, but also can interfere with the central nervous system of the brain, making people feel dizzy, unsteady on their feet, headaches, insomnia, lack of concentration, loss of appetite and other symptoms. Cabaret neon flashing lights in addition to damage the human visual function, but also can disturb the internal balance of the human body, so that the body temperature, heartbeat, pulse, blood pressure, etc. become uncoordinated, causing dizziness, irritability, loss of appetite and fatigue and insomnia and other light damage syndrome. Fluorescent lamp exposure time is too long will reduce the body's ability to absorb calcium, resulting in the body calcium deficiency.
Now some luxury cabaret halls are equipped with laser devices. According to the relevant health departments of dozens of cabaret laser equipment to do the investigation and measurement shows that the vast majority of cabaret laser radiation pressure has exceeded the limit value. This high density of thermal light beam through the lens of the eye and then concentrated in the retina, the spot temperature can reach 70 degrees Celsius, which is very harmful to the eyes and brain nerves. It can not only lead to people's eyesight is impaired, but also make people have headaches and dizziness, cold sweats, neurasthenia, insomnia and other diseases of the central nervous system of the brain.
Scientists' latest research shows that colored light pollution is not only detrimental to human physiological functions, but also has an impact on the human psyche. "Spectral light chromaticity effect" measurement shows that, such as the psychological impact of white light for 100, then the blue light for 152, purple light for 155, red light for 158, black light is the highest, for 187. If people are in the long-term irradiation of colored light, the psychological accumulation effect, but also varying degrees of fatigue caused by weakness, dizziness, Loss of libido, impotence, menstrual disorders, neurasthenia and other physical and mental disorders.
At present, light pollution is not included in the environmental pollution prevention and control category, but its harm is obvious, and in the aggravation and spread. Light pollution has increasingly attracted the attention of scientists, they are trying to study the methods of prevention. People in life should also pay attention to prevent all kinds of light pollution on the health hazards, avoid too much exposure to light pollution for too long. We should actively create a beautiful and comfortable environment to minimize the harm of light pollution.
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