The sun provides the Earth’s surface with energy in various forms, including UV radiation, visible radiation (light), and infrared radiation (heat). However, environmental pollution is damaging the ozone layer, allowing more harmful UV rays to reach the Earth’s surface.
To address this situation, SK SKINCARE FILM® is an eco-friendly product that protects your skin from harmful UV rays and saves energy by preventing infrared radiation from heating up the environment inside your car.
The sun emits energy in a wide range of wavelengths. Radiation from UV rays, which have wavelengths shorter than those of blue or purple visible light, burn the skin and have adverse impacts on human health. The ozone layer, which is located in the stratosphere, prevents most harmful UV radiation from reaching life on Earth. But as the ozone layer thins, UV radiation on Earth’s surface increases.
Scientists categorize UV radiation into three types: UV-C, UV-B, and UV-A. The ozone layer in the stratosphere is not a perfect barrier to UV radiation, meaning that some wavelengths of UV
rays are able to reach the Earth’s surface.
(1) UV-A (320~380nm): UV-A rays are not absorbed by the ozone layer. With wavelengths ranging from 0.32 to 0.38㎛, UV-A radiation may carry less energy than UV-B, but can ‘burn’ your skin. Although sunburn is caused mostly by UV-B, UV-A not only reddens the skin but also has an impact on the skin’s immune response, resulting in skin ageing and long-term skin damage. Recent reports claim that prolonged exposure to UV-A resulting in sunburn raises the risk of skin cancer as much as exposure to UV-B. When UV radiation makes contact with the human body, it is absorbed by the skin, stimulating an immune response to protect the skin from damage. For instance, when some cells are exposed to UV rays, they produce dark pigments of melanin, a substance that absorbs UV rays. Therefore, people whose cells produce less melanin, such as fair-skinned people, have less natural protection against UV-B.
(2) UV-B (280~320nm): Most UV-B rays are absorbed by the ozone layer, but some do reach the Earth’s surface. The UV-B radiation that reaches the Earth’s surface has wavelengths ranging from 0.28 to 0.32㎛ and is capable of penetrating deep into skin tissue, burning the skin of animals, and sometimes causing skin cancer. Most instances of skin cancer are attributed to overexposure to sunlight and UV-B. However, UV-B is not all bad. It activates pro-vitamin D and converts it to vitamin D, which is essential to the human body.
(3) UV-C (100~280nm): UV-C rays are completely absorbed by the ozone layer. With wavelengths ranging from 0.20 to 0.29㎛, UV-C is the most damaging type of UV radiation. It is capable of causing chromosome variation, killing single celled organisms, and damaging the cornea. Fortunately, ultraviolet rays within the UV-C range are almost completely absorbed by the ozone layer.