What is Ultraviolet Radiation?
UV is a type of light from the sun or certain kinds of artificial light.
The earth's ozone layer protects us from too much exposure to UVR from the sun. As the ozone layer thins, the amount of UV reaching us increases.
Types of UV Rays?
There are three types of UV rays:
- UVA rays cause tanning, premature aging and wrinkling of the skin and weaken the immune system. They are common in tanning beds.
- UVB rays cause the skin to tan and burn.
- UVC rays are the most damaging type but are filtered by the ozone layer.
To learn more about the health effects of ultraviolet radiation and how to protect yourself visit Canadian Cancer Society Sun and UV pages OR Government of Canada web site .
What is the UV Index?
The UV index tells us how intense the sun's UVB rays are - Remember these are the rays that cause the skin to tan and burn.
There are five categories - low, moderate, high, very high and extreme.
You should always take precautions when the UV index is 3 (moderate category) or higher.
To learn more about the UV Index and how to protect yourself visit Environment and Climate Change Canada pages at Government of Canada.