The Meaning of the UV Index Scale

Ever wonder what the UV Index means?

Photo by Charlene Marie

For many years, scientists have been studying the sun and its effects on our habitat. In order to measure the sun’s rays, a scale called the UV or ultraviolet Index scale was created. This handy little chart is used frequently by meteorologists and lets us know when exposure to the sun is dangerous. Today, Sunglasses Avant Garde will give you a breakdown of this colorful safeguard.

In a nutshell, ultraviolet rays are a form of radiation emitted by the sun that can cause damage to human skill cells, if overexposure occurs. Although they are invisible to human eye, they can have a vast effect on our body.

Check out the illustration of the UV Index scale below and see what the colors and numbers mean.

Illistration courtesy of epa.gov

Green: 2 or less

When looking at the UV Index scale, think of it like a sideways traffic light. If you see green, you are good to go outside. You will still get some exposure to the sun, so it is always a good idea to wear sunglasses and a light sunscreen, if you are sensitive to the sun.  

Yellow: 3 to 5

A yellow block on the UV Index means there is a moderate risk of harm due to sun exposure. In other words, if you plan on being outside for a long period of time, find shade during the brightest hours of the day and take advantage of sunscreen and protective eyewear.

Fun fact: Did you know that bees can see ultraviolet rays?

Orange: 6 to 7

If you see orange on the UV Index, take precautionary measures and limit your exposure. This means the sun’s rays are strong and can cause damage quickly if skin is exposed. Definitely use a heavier sunscreen, at least an SPF 20 or above and protect your eyes. Utilizing a brimmed hat is beneficial when the UV Index is high.

Red: 8 to 10

If you see red on the UV Index, stop and think before stepping out into the light. Red is an indicator that the UV rays are very harsh. Wear your sunglasses and lather your skin with an even thicker sunscreen. SPF 35 or above is typically better. Make sure sunscreen is reapplied if excess sweating occurs and try to stay out of the sun for long periods of time.

 Sunglasses like these TAG Heuer 0231 402 Speedway series will help protect your eyes

Purple: 11 +

A purple color on the UV index means the sun’s rays are extremely dangerous to unprotected skin. Since burning can occur at a rapid rate, make sure you cover up, bring your UV-protective shades, hat and do not leave without sunscreen. On days when the UV index is so extreme, it might be best to enjoy an indoor activity.  

Keep your eyes on the UV Index and help protect yourself from the sun’s harmful rays. Your body will thank you in the long run!

Do you have any comments or suggestions about today’s blog? Let us know!

~Charlene Marie