Glad this was pointed out - this article is specifically about regions in “low” UV latitudes, with the actual subject being from the UK.

Accounting for UV intensity of your home country is crucial. Don’t just go out and frolic without precautions just because a study from the UK found sun exposure was good. Their sun isn’t built the same.

Mid day UV index in SF is 9 as I type. Compare what the paper says about the UK UV index:

“ The UV index [in the uk], which measures the erythemal intensity of sunlight, rarely exceeds 6 (where 3–5 is classified as moderate and 6–7 high)”

Make good decisions people! I got some sun when the UV was 2 early in the early morning. Now it’s 9 at midday. All sun is not equal.