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When the weather is warm and sunny, many people enjoy spending time outdoors. You might see people sitting on benches, eating lunch, or playing with their dogs in the park. The sun feels nice, but it also gives off ultraviolet radiation, or UV rays. UV rays travel from the sun through the atmosphere and reach our skin. While some UV exposure is good for us because it helps our bodies make vitamin D, too much can be harmful.

Vitamin D is important for our bones, blood cells, and immune system. However, experts warn that we need to be careful about how much time we spend in the sun. Every time our skin gets burned by the sun, our risk of getting skin cancer increases. Melanoma, which is the most dangerous type of skin cancer, is now one of the most common cancers in the UK. UV rays can damage the DNA in our skin cells, which can lead to cancer. UV exposure also causes our skin to age faster, leading to wrinkles and sagging. It can even damage our eyes and cause problems like cataracts.

To help people understand how strong the UV rays are, scientists use something called the UV Index. The UV Index is a number that shows how much UV radiation is in the sunlight. The numbers start at zero and can go above ten. The higher the number, the more dangerous the UV rays are. The UV Index is usually highest around midday, when the sun is at its strongest.

Different places in the world have different UV levels. For example, countries near the equator, like Kenya, can have UV levels above ten all year long. In Spain, the UV Index can reach nine in the summer. In the Falkland Islands, the UV Index rarely goes above five, even in summer. The World Health Organization says that when the UV Index is one or two, you do not need to worry about sun protection. When it is three to five, you should start to protect your skin. When it is six or higher, you need to be extra careful.

Children are more sensitive to UV rays than adults, so they need more protection. To avoid UV damage, you should spend time in the shade when the sun is strongest, usually between 11 am and 3 pm. Wearing hats, sunglasses, and clothes that cover your skin can help protect you. You should also use sunscreen with a high SPF, like 30 or more, and make sure it protects against both UVA and UVB rays. It is important to put sunscreen on all exposed skin and to reapply it regularly, especially if you are swimming or sweating.

Many people forget to put sunscreen on certain areas, like the sides of their nose, temples, and upper chest. Doctors recommend using about six to eight teaspoons of sunscreen to cover your whole body. Even on cloudy or windy days, UV rays can still reach your skin and cause burns. The temperature does not affect the amount of UV, so you can get burned even if it is not very hot outside.

Some people think they can get a safe tan, but doctors say there is no safe way to tan in the sun. Tanning is your skin's way of trying to protect itself from UV damage, but it does not offer much protection. If you want to look tan, it is safer to use self-tanning products.

People with darker skin can also get skin cancer and other problems from UV rays. Everyone, no matter their skin color, should protect themselves from the sun. Too much UV can also damage your eyes and weaken your immune system. By being careful and using sun protection, you can enjoy the sunshine without putting your health at risk.