I'm trying to get a good estimate of the risks associated with sun exposure. I'm assuming things scale linearly (the UV index units, which need a name ("UVees"?) are linear). This may not be a good assumption, but it seems somewhat likely that it would be within the range I most care about (significant exposure, but not enough to get burnt -- if I'd get burnt, I'll certainly cover up or wear sunscreen).
I know sun exposure is a major source of skin cancer risk, but I'm not sure how much of that is coming from people who have tons of exposure, and how much risk a moderate level of exposure actually brings.