I just saw the new video by It’s Okay To Be Smart (https://youtu.be/FnDP1sjKGfU) and got confused when he said that glass is opaque to the UV light. If it is in fact UV light repellent, why are you still able to get tanned when exposed to the sunlight for example through a car side window?
In: Physics
The short answer is that your front windshield is generally considered to be around ~90%+ effective at blocking UVA and UVB rays, but your side windows are only about ~50% effective at blocking UVA rays which account for aging your skin (and tanning).
I am not a scientists or a physician but do work in medicine and have worked in the Dermatology specialty as a technician for 3 years.
[https://www.skincancer.org/blog/sneaky-ways-youre-being-exposed-to-the-suns-uv-rays/](https://www.skincancer.org/blog/sneaky-ways-youre-being-exposed-to-the-suns-uv-rays/)
[https://www.cdc.gov/nceh/features/uv-radiation-safety/index.html](https://www.cdc.gov/nceh/features/uv-radiation-safety/index.html)
[https://www.aad.org/media/stats-skin-cancer](https://www.aad.org/media/stats-skin-cancer)
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