Many people know that too much sun exposure can cause burns, redness, fever, and sometimes even illness. However, there is a common misconception that sunscreen is only necessary in the summer when the weather is sunny. Scientists have proven that the spectrum of the sun's radiation is much broader than the visible light. There are three kinds of radiation: UVA, UVB, UVC.
UVA has a wavelength of 320-400 nanometers, and accounts for about 90% of the total UV flux. Radiation penetrates through the atmosphere, clouds, and window panes. UVA is the main cause of tanning and increases the concentration of melanin. They only penetrate the upper layers of the skin without damaging the skin's texture. However, such rays can leave burns and cause pigmentation.
UVB - wavelength is 290-320 nanometers. These rays have much more energy and have a stronger effect on the skin. Despite the fact that they are absorbed by the ozone layer, a large part of them reaches the ground. The UVB rays when in contact with skin penetrate into its deeper layers and can cause pigmentation, premature aging and melanoma.
The wavelength of UVC is less than 290 nanometers. The rays are completely absorbed by the atmosphere.
UV protection is needed all year round because it does not change with the seasons. It is the infrared rays, not the UV rays, that create the heat. Therefore, it is necessary to take care to protect exposed body parts all year round!