United States has high — daily sun protection matters, especially midday and in summer.
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United States has high — daily sun protection matters, especially midday and in summer. UV varies significantly by region and season — the southern and southwestern states, plus high-altitude areas, see notably higher levels than the north.
SPF 30, reapplied every 2-3 hours during outdoor activity, especially midday.
Yes — up to 80% of UV rays pass through cloud cover, so overcast skies in United States don't mean you can skip sun protection.
Yes — UV exposure increases roughly 10% for every 1,000 meters of altitude, so mountain or high-plateau areas within United States need extra protection compared to sea-level spots at the same latitude.
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