What is the meaning of the UV index that often appears in weather forecasts?

The UV Index in weather forecasts, referred to as UVI, is an indicator of the potential impact of ultraviolet radiation intensity on human health. UVI divides ultraviolet rays into UV-A, UV-B and UV-C. UV-B has the greatest impact on human health. UVI is evaluated based on the intensity of UV-B. UVI is divided into six levels, from low risk (level 0-2) to particularly dangerous (level 11 and above), reminding us to take different protective measures.

When the UVI is below 3, the risk is low, but proper sun protection is still required; when it is level 3-5, you should apply sunscreen, wear sunglasses when going out, and avoid strong light at noon; when it is level 6-7, you should Strengthen sun protection and choose parasols or hats; for levels 8-10, it is recommended to avoid going out for long periods of time, and for levels 11 and above, it is recommended to avoid going out, and comprehensive protection is required when necessary. Excessive ultraviolet rays can not only cause skin damage and aging, but also have effects on animals and plants, such as eye problems and hindered photosynthesis.

The key to preventing ultraviolet rays is to arrange activity time reasonably, try to avoid strong light exposure, wear sun-protective clothing, and use sunscreen. Today's weather forecast not only provides UVI index, smart devices can also monitor and remind in real time. Therefore, understanding the meaning of UVI index and learning relevant knowledge are important steps to protect our health.