Is it true that UV rays are more powerful on cloudy days? Apparently so. Weird.
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I absolutely have to check out that page. I’ve experienced worse all-over burns on slightly cloudy or hazy days, partly because it’s too easy to think there’s no need for shade or sunscreen.
I think that’s a huge factor (”It’s cloudy / not hot / no sunscreen needed”), but according to the page, there’s an actual harmful difference in UV levels as well.
The difference between UV-A and UV-B is important to understand. Angry Toxicologist wrote about it here… Well sorta. He more or less went into the new FDA system, but still there is some good info.