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2. Sunscreen - Wikipedia

   en.wikipedia.org/wiki/Sunscreen

   The sun protection factor (SPF rating, introduced in 1974) is a measure of the fraction of sunburn-producing UV rays that reach the skin. For example, "SPF 15" means that 1 ⁄ 15 of the burning radiation will reach the skin, assuming sunscreen is applied evenly at a thick dosage of 2 milligrams per square centimeter [68] (mg/cm 2). It is ...

3. How to choose the best sunscreen - AOL

   www.aol.com/news/choose-best-sunscreen-205950421...

   Sun protection factor. SPF, or sun protection factor measures your level of protection against a sunburn. ... It's also water-resistant for up to 80 minutes, and has a 4.7-average star rating from ...

4. A decades-old FDA rule is keeping Americans from having ...

   www.aol.com/news/whats-keeping-u-allowing-better...

   The disease has cost the health care system $8.9 billion a year, ... The sun protection factor, or SPF, rating on American sunscreen bottles denotes only a sunscreen’s ability to block UVB rays.

5. Ultraviolet index - Wikipedia

   en.wikipedia.org/wiki/Ultraviolet_index

   Ultraviolet index. The ultraviolet index, or UV index, is an international standard measurement of the strength of the sunburn -producing ultraviolet (UV) radiation at a particular place and time. It is primarily used in daily and hourly forecasts aimed at the general public. The UV index is designed as an open-ended linear scale, directly ...

6. Sun protective clothing - Wikipedia

   en.wikipedia.org/wiki/Sun_protective_clothing

   UPF (ultraviolet protection factor) represents the ratio of sunburn-causing UV without and with the protection of the fabric, similar to SPF (sun protection factor) ratings for sunscreen. While standard summer fabrics have UPF ~6, sun protective clothing typically has UPF ~30, which means that only 1 out of ~30 units of UV will pass through (~3%).

7. The best sunscreens dermatologists use - AOL.com

   www.aol.com/lifestyle/best-sunscreens-summer...

   Two experts we spoke with — Dr. de Moll and Dr. Magovern — recommend EltaMD UV Clear for those with oily, acne-prone skin because of its lightweight, oil-free formula that won't clog pores. It ...