The weather slowly warmed up, and summer came quietly with heat waves.

How to avoid get sunburned when going out has become a top priority for people, especially those who don't want to be hurt by the sun.

If you want to do a good job of sun protection, you must first understand what factors in the sun can cause people to tan and sunburn, so as to prevent symptoms.

Sunlight is divided into visible light and invisible light. In addition to preventing the direct exposure of visible light, it is necessary to prevent the damage of invisible light. Invisible light is divided into UVA, UVB, UVC, V-UV. The UVC wavelength is only 100-280nm, and it has been completely blocked in the ozone layer. And UVB with wavelengths between 280-315nm and 315-400nm can reach the surface and directly hit human skin. For a long time, it will cause skin aging and melanin precipitation.

After understanding the above principles, let's see sun protection measures:

1. Physical protection: such as wearing a sun hat, parasol, sunglasses, and sun protection clothing, etc., which can effectively prevent sun protection.

2. Chemical protection:Such as sunscreen lotion, sunscreen stick, sunscreen cream, and sunscreen spray on the market, choose the sunscreen method that suits you.The best time to apply it is 15-30 min before going out,use it after lotion and before makeup.

Before choosing sunscreen products, you must accurately understand the sun protection index of the product.

According to the recommendations of the WHO, if you are exposed to sunlight for a long time, it is recommended to use:

1.At least SPF15 or above

2.Broad-spectrum sunscreen

3.Reapply every 2 hours

In addition to reapplying sunscreen products in time, the thickness of the application must reach 2 mg per square centimeter as required, similar with the lotion is about 1 cent per face, and the thin texture may require more.

Since WHO is an organization facing the whole world, the recommended SPF will be a basic value, and the value recommended by most countries will be higher than this.

For example, the SPF recommended on the official website of the US Environmental Protection Agency is 30. our country's sun protection experts recommendations are 25-30.

Therefore, a truly qualified sunscreen should achieve 5S, they are:

Establishing the correct sun protection concept and adopting scientific methods can achieve no sunburn, and protect our skin health. Have you learned more?