Skin Type III should avoid the sun at noon. They should wear a hat and sunglasses to protect your body. Protect lips and neck as well. Your self-protection time is 20-30 minutes. For a UV index of 3-4, use a sun protection factor of 10–15. For a UV index of 9+, use a sun protection factor of 15–20. And don't forget to apply sunscreen regularly. These are estimations, use enough sun protection and sunscreen!
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Disclaimer of liability
All information without guarantee. The data given are approximate values and may vary from person to person. The times mentioned vary as soon as sunscreen comes into contact with water. In addition, the respective seasons, locations such as directly at or in the water or in the mountains (snow) reduce the protection time enormously. All data are average values and cannot be used reliably for the individual person. Always protect yourself sufficiently.