People assume that it's safe to sit in the sun if it's through a window, and although that is partly true, there is still a danger to it.
As the warm weather and sun come out this weekend and into next week people will be soaking up as much sun as possible, and then heading inside for a break. While people may think when they move inside they are safe from the dangers of the rays coming down.
According to Healthline, it's unlikely that you will get a tan through a window but it often depends on the type of glass you are near. In older homes, there is less protection than in newer homes where they have newer glass which is thicker, double or triple paned, and some even coasted with a UV filter.
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When it comes to cars and windshields these are made with laminated glass for safety and tend to filter out more UV light than side windows. There are two different types of UV light, UVA and UVB which can damage the skin in different ways.
UVA affects the deepest layers of the skin and is what gives the skin a tan but can also cause wrinkling and some skin cancers. UVB targets the top layers of the skin and is the cause of most skin cancers.
If near a window there is a slight chance of getting a tan, or even sunburn if there for long enough, from the UVA rays but the majority of windows now block out most UVB rays. Although you could walk away with a tan you can't get any vitamin D as that is from the UVB rays.
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