Readers share personal cues for detecting UV exposure
3 Yesterday 6:35 PM · 1d ago · 3 comments · 1 source · development 3 of 4
Commenters describe non-heat signals they use to gauge UV risk, including a distinct sensation from unblocked skin under sunblock, the shadow-length rule of thumb, and changes in sky color on high-UV days.
“I can feel where there are holes in my sunblock (which only block UV) which lets me know where to apply it, and the sensation is not one of heat of the sun, it's different.”
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What people said 3 voices · verbatim
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I don't know about this. I can feel where there are holes in my sunblock (which only block UV) which lets me know where to apply it, and the sensation is not one of heat of the sun, it's different. I'm not sure about the mechanism, but the presence of the sunblock stops the "UV" type sensation. This from the moment I put it on to long after the…
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Good post - the UV index is related to how short the "column of air" that the sun traverses to get to your skin - noon is the shortest distance. Scattering is a density function (more air, more scattering), so this is why it looks like cos^p when compared to normal irradiance (cos). It also explains why it is hard to get a sunburn in the temperate…
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I've heard a quick way to determine if the UV index is dangerous is if your shadow is shorter than you. Though location matters too.I moved from Vermont to Texas and had to purchase an umbrella with UV protection to walk around during the day. The highest the UV index hits in the Vermont's summer is 6. In Texas, it's 11+ !!! 15 minutes and you're…
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