Ultraviolet radiation (UV)

UV Index

For the public

What does the UV index mean?

The levels of UV radiation and therefore the values of the index vary throughout the day. In reporting the UVI, most emphasis is placed on the maximum UV level on a given day. This occurs during the four-hour period around solar noon. Depending on geographical location and whether daylight saving time is applied, solar noon takes place between noon and 2 p.m. The media usually present a forecast of the maximum UV level for the following day.

How can the UV index help me to protect myself?

Most people are used to adjusting their daily plans and choice of clothing to the weather forecast, especially to temperature predictions. Analogous to the temperature scale, the UVI gives an indication of the level of UV radiation and the potential danger of sun exposure. It can help individuals make healthy choices.

UV codes
Enjoy the sun, but enjoy it safely!

Step 1: Find out today’s UV Index

Step 2: Check out the recommended sun protection.

0 to 2 You can safely enjoy being outside!
3 to 7 Seek shade during midday hours! Slip on a shirt, slop on sunscreen and slap on hat!
8 Avoid being outside during midday hours! Makde sure you seek shade! Shirt, sunscreen and hat are a must!

Even for very sensitive fair-skinned people, the risk of short-term and long-term UV damage below a UVI of 2 is limited, and under normal circumstances no protective measures are needed. If sun protection is required, this should include all protective means, i.e. clothing and sunglasses, shade and sunscreen.

Where is the UV index reported?

In many countries the UVI is reported along with the weather forecast in newspapers, on TV and on the radio; however, this is usually only done during the summer months.

UV Index reporting for a range of countries and in many different languages.