[sitkack]

We need a little UVB everyday to maintain melanin (skin pigment) and skin thickness. If you work inside M-F and then go hard on the weekends outdoors, you will receive disproportionate damage from sunlight.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3427189/

https://www.who.int/news-room/questions-and-answers/item/rad...

If you are blocking UVB, you should be blocking UVA as well. The bus folks are doing some good thinking.