What is UV?

UV, or ultraviolet, radiation is a part of the sun’s spectrum of wavelengths. UV radiation is invisible, yet it has a profound effect on us and on our homes. Short-term overexposure to UV can cause sunburn, and long-term overexposure can cause skin cancer, cataracts and can even suppress the immune system. In our homes and offices, UV radiation is largely responsible for fading and damaging fabrics, carpet, wood furniture and artwork.


The Climate Prediction Center tracks and publishes an index of UV radiation every day. The UV Index is a numerical measure of the amount of damaging UV radiation expected to reach the earth when the sun is at it’s highest point on that day. The center has chosen to provide this index for 58 cities in the United States and Puerto Rico.
Click here for the most current UV Index.

Although we must rely on protective clothing and sunblock to defend ourselves against UV when we are outside, we can block up to 99% of the harmful UV radiation from entering our homes or offices by using 3M window film.

For more information about the UV Index, UV radiation, UV and fading, plus up-to-date information about skin cancer and ways to prevent it, please visit the following links:

Climate Prediction Center - Stratosphere: UV Index

PG&E Energy Center - Solar Ultraviolet Radiation and Fading

Skin Cancer Foundation - Skin Cancer Prevention