Turns out, sustained exposure to sunlight, as explained in a 2015 study in the International Journal of Cosmetic Science, lets the UVA and UVB rays pass through multiple layers of your hair, impair your hair strands, and give you a significant hair breakage. As far as your scalp is concerned, the sun is your hair's worst enemy.
"UVB rays, the primary sunburn ray, are largely blocked by glass; but more than 50 percent of UVA rays, the main cause of premature skin aging, can penetrate glass. (Both UVA and UVB rays contribute to the development of skin cancer.) If you’re anywhere within several feet of the window, the rays will reach you." source

In other words, more of the incident UVA and UVB photons are reflected away from the surface rather than being transmitted through the sample. Furthermore, UVA and UVB photons can be hindered internal to the sample by internal scattering from small grains close to the size of the incident wavelengths.

An alternative is to treat the air, using UV-C light. That can take place above or below the ceiling tiles. For example, an emerging solution is combining UV-C light with electrostatic technology in one filter in an air handling unit (AHU). Or an in-room unit can circulate the air through a HEPA or other filter, then apply UV-C light. For instance, a study found that up to 74.3% of UVA radiation can still pass through smooth glass windows. Blue glass windows also transmitted up to 56.8% of UVA radiation. Curtains and shades can help cut this down, but they also block a lot of natural light. The great news is, house window tinting can help you minimize UV ray penetration. At
This sunglass tint is gray in color and has a Visible Light Transmittance of about 15%. This means 15% of the available light will pass through the lens. The gray lens will absorb 99.9% of UVA and UVB radiation up to 400nm. The gray lens tint also provides true color recognition and meets the traffic signal color requirements of ANSI Z80.3-1996.
6 days ago · UVA is a longer wavelength associated with ageing, which can penetrate the eye and damage your retina (back of the eye). UVB is a shorter wavelength associated with burning and skin damage. These rays can pass through and damage your cornea (front of your eye) and lens (focuses light onto the retina). Common effects of UV exposure on the eyes Exposure to ultraviolet (UV) radiation is the leading cause of skin cancer. There are 2 types of UV radiation:Ultraviolet A (UVA). UVA radiation can pass through glass. Research suggests that it may:Cause premature aging and wrinkling of the skinPlay a role in causing basal cell carcinoma, squamous cell carcinoma, and melanomaUltraviolet B (UVB). UVB does not pass through car windows or other Solar emissions include visible light, heat and ultraviolet (UV) radiation. Just as visible light consists of different colours that become apparent in a rainbow, the UV radiation spectrum is divided into three regions called UVA, UVB and UVC. As sunlight passes through the atmosphere, all UVC and most UVB is absorbed by ozone, water vapour
Normal glass is fairly opaque to the UVB band, blocking nearly 100% of it, which is the UV band usually considered to be the most damaging to your skin. Normal glass is mostly transparent to UVA (to 330 nm), allowing 80% of the band’s radiation to pass through (UVA penetration is needed for water purification).

PET is sensitive to UV light especially at elevated temperatures, under high humidity, and in the presence of oxygen—all of which are present when PET bottles are exposed to the weather. In response, Plastic Technologies, Inc. (Holland, OH) undertook a study to understand the effects weathering would have on PET bottles exposed to Toledo, OH

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