https://en.wikipedia.org/wiki/Ultraviolet https://en.wikipedia.org/wiki/Ultraviolet I wasn't aware of this, so I looked it up. It seems some UV light can be io

https://en.wikipedia.org/wiki/Ultraviolet https://en.wikipedia.org/wiki/Ultraviolet I wasn't aware of this, so I looked it up. It seems some UV light can be ionizing, such as the shorter wavelength variety. UVB is not, but can cause chemical reactions, such as fluorescence. UVC, which can be ionizing, doesn't normally reach earth's surface. UV light causes reactive oxygen species, I guess this is not the same as ionizing. https://en.wikipedia.org/wiki/Reactive_oxygen_species https://en.wikipedia.org/wiki/Reactive_oxygen_species https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3709783/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3709783/ (EDIT: more responses have been added by others that echo this information)