I understand that clouds and the angle of the sun rays will have an effect, but why at the same time of day and time of year would it change?
In: Physics
The ozone layer in our stratosphere ins’t a constant thickness around the globe ([this video has a cool visualization](https://www.youtube.com/watch?v=fzN0LbZXX1s)) it moves and the hole over the artic grows and shrinks and warbles throughout the season. Thus the local thickness of it AND the incident of sun rays based on time of year AND cloud cover and other atmospheric effects all play a part. Absorbtion from smog and pollution, which is also influenced by pressure systems and winds play a factor as does snow cover (snow reflects UV and other wavelengths of light so if you’re outside in the snow you’re getting what could amount to a double dose on your exposed skin.
The thickness and concentration of gasses in the atmosphere and ozone layer have a big effect in blocking UV, and they can change without visible indication.
Is it because the air is cleaner with way fewer flights crossing the country?
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