2 days in the same week so the sun would be the same distance from Earth, no clouds anywhere, how can one day have a a different UV danger rating to the other?
In: Planetary Science
While I can’t speak specifically for your situation, there’s an important thing to keep in mind here.
UV radiation is a type of light that is invisible to our eyes. So, while the way a day looks tells us the conditions for visible light, there’s no easy way for our eyes to tell the conditions for UV light. Materials behave differently to different wavelengths of light, which is likely what leads to this discrepancy. (You can see an easy visible light example of this in the blue sky; the sky looks blue because one wavelength is scattered more than others).
The most likely thing that happened was that, on one of those days, there was something in the atmosphere that affects only UV light, like a thin dust or a denser ozone layer
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