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  2. You May Not Be Putting Enough Sunscreen On Your Face ... - AOL

    www.aol.com/lifestyle/may-not-putting-enough...

    To make sure you are adequately protecting your skin from damaging rays, dermatologists say this is the exact amount of sunscreen to slather on. Plus, tips on how to reapply.

  3. Sunscreen - Wikipedia

    en.wikipedia.org/wiki/Sunscreen

    Sunscreen labeling standards have been evolving in the United States since the FDA first adopted the SPF calculation in 1978. [144] The FDA issued a comprehensive set of rules in June 2011, taking effect in 2012–2013, designed to help consumers identify and select suitable sunscreen products offering protection from sunburn, early skin aging ...

  4. Does sunscreen expire? Should you wear it indoors ... - AOL

    www.aol.com/lifestyle/does-sunscreen-expire-wear...

    Ultimately, some sunscreen is better than no sunscreen, but either way it is important to ensure enough sunscreen is applied.” However, some dermatologists recommend caution around using spray ...

  5. Ultraviolet index - Wikipedia

    en.wikipedia.org/wiki/Ultraviolet_index

    Reduce time in the sun between 10 a.m. and 4 p.m. If outdoors, seek shade and wear sun-protective clothing, a wide-brimmed hat, and UV-blocking sunglasses. Generously apply broad spectrum SPF 50+ sunscreen every 1.5 hours, even on cloudy days, and after swimming or sweating. Bright surfaces, such as sand, water, and snow, will increase UV exposure.

  6. How much sunscreen should you use and how often do you ... - AOL

    www.aol.com/much-sunscreen-often-apply-075051498...

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  7. Sunshine duration - Wikipedia

    en.wikipedia.org/wiki/Sunshine_duration

    The first measure indicates the general sunniness of a location compared with other places, while the latter allows for comparison of sunshine in various seasons in the same location. [1] Another often-used measure is percentage ratio of recorded bright sunshine duration and daylight duration in the observed period.

  8. Campbell–Stokes recorder - Wikipedia

    en.wikipedia.org/wiki/Campbell–Stokes_recorder

    Comparisons with automatic instruments at German stations revealed that during summer the differences of the two measurement systems can reach up to 4 h per day. The mean difference was −0.23 h, i.e. the measurements of the Campbell–Stokes recorder are larger than the automatic.

  9. Iscotrizinol - Wikipedia

    en.wikipedia.org/wiki/Iscotrizinol

    Iscotrizinol (USAN, [1] INCI diethylhexyl butamido triazone) is an organic compound used in sunscreens to absorb UVB and some UVA radiation [2] with a peak protection at 310 nm. [3] It is one of the most photostable chemical sunscreens known today with 25 hours required to lose 10% of its SPF protection ability. [4] It is marketed as Uvasorb ...