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Best Answer: UV B rays do not pass through glass--they make you burn/tan UV A rays do pass through glass. Basically, it the dangerous ones are the UVA because you don't burn from them, but it can still damage your skin. if you're getting sun through glass for a long period of time it is recommended you use sunscreen. However UV A passed through and causes tanning, premature aging/wrinkling and age spots of the skin and increases the risk of developing Melanoma. Bottom line: use sunscreen whether windows or not. Generally a SPF over 30 is recommended.
In brief, some types of UV light can pass through window glass. UV light is divided into three classifications called UV-A, UV-B, and UV-C. Of these three classes, UV-A and UV-B are associated with sunburns and tanning, and UV-A is thought to suppress the immune system. Research increasingly points to ultraviolet A (UVA) radiation penetrating through car windows. UV radiation from the sun, associated with about 90 percent of all skin cancers, reaches the earth as long- wavelength UVA and shortwave UV B rays. glass effectively blocks UVB, and windshields are specially treated to block UVA as well, but a car's.
However, the side and rear windows are usually made from non-laminated glass and let much of UVA through. Clear non-laminated car windows allow up to % of UVA to penetrate. Tinting reduces UVA penetration to about %, a much better but still significant level.
Automotive glass used for side and rear windows ordinarily does not protect against UVA exposure. Similarly, the window glass used in homes and offices does not filter much UVA. Similarly, the window glass used in homes and offices does not filter much UVA.
Some UV rays can also pass through windows. Typical car, home, and office windows block most UVB rays but a smaller portion of UVA rays, so even if you don't feel you're getting burned your skin may still get some damage. Tinted windows help block more UVA rays, but this depends on the type of tinting.
Can one measure the indoor bouncing around of UVA after it gets through windows? Too many ppl say on the Internet that there's a problem if you're face is being directly hit by sunlight through a window.
Normal glass (as used in windows) is transparent to UV radiation to a wavelength of about nm (UV-A). The transparency is quite high so almost all UV-A light will pass through glass. Below nm (UV-B and UV-C), almost % is block by normal glass. Question 2: I am a research student, and I am working on UV treatment for air pollutants.
UVA is further divided into two wave ranges, UVA I, which measures nanometers (nm, or billionths of a meter), and UVA II which extends from nanometers. UVB ranges from to nm. With even shorter rays, most UVC is absorbed by the ozone layer and does not reach the earth.