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UV general classification
Near ultraviolet (UVA): A long-wave ultraviolet light, a wavelength of between 315 to 400 nm, penetrate clouds, glass and the car into the interior, to penetrate the dermis layer of the skin, can cause tanning, but also skin aging, the main cause of skin cancer and wrinkles. UVA can be subdivided into UVA-2 (320 ~ 340nm) and UVA-1 (340 ~ 400nm)
The most penetrating UVA-1, can reach the dermis layer of the skin tanning, damage to the skin of the biggest, but it is also the most easily overlooked, especially in the non-summer months when the intensity of UVA-1, although weak, but still exists, because of the cumulative amount of time, causing skin damage. Especially loose skin aging, wrinkles, loss of elasticity, pigmentation ...

Ze UVB and UVA-2 can also reach the epidermis, which can cause sunburn, redness, tingling, actinic keratosis (age spots), loss of sense of transparency.

Ultraviolet (UVB): ultraviolet B light, the wavelength of between 280 to 315 nm, is absorbed by stratospheric ozone, can cause sunburn and skin redness, swelling, heat and pain will be severe blisters or peeling (similar to the symptoms of burns)
Far ultraviolet (UVC): C shortwave ultraviolet light, the wavelength of between 100 to 280 nm, the wavelength is shorter, more dangerous, can be blocked by the ozone layer does not reach the Earth's surface, less likely to abuse human skin.
Each individual tolerance to ultraviolet light is different depending on the cumulative amount of sunlight to a certain limit, it will cause harm. Industrial equipment exposed to produce high-intensity UV-C or UV-B and UV-A will also cause damage to the surface of the eye tissue.




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