What is the ultraviolet level?

According to the new ultraviolet index standard formulated by the World Health Organization, the World Meteorological Organization and the United Nations Environment Organization in 2002, the ultraviolet intensity is divided into five grades: weak, medium, strong, very strong and extremely strong.

1 and 0-2 1 are the weakest security, and measures may not be taken.

2, 3-4, 2 weak, wear protective hats or sunglasses when going out normally.

Grade 3, 5-6, 3: Besides wearing protective hat and sunglasses, you should also pay proper attention to applying sunscreen (SPF index of sunscreen should not be lower than 15).

4. Top 4 teams in July-September avoid going out during the morning 10 to 4 pm, and try to go out in the shade.

5、gt； Grade 10 5 is very harmful. Try not to go out. When you have to go out, you should take certain protective measures.