The US National Weather Service and the Environmental Protection Agency (EPA) have developed the UV Index, which gives you an idea of how strong the UV light is in your area on any given day, on a scale from 1 to 11+.
Reflection off surfaces: UV rays can bounce off surfaces like water, sand, snow, or pavement, leading to an increase in UV exposure. Cloud cover: The effect of clouds can vary, but it's important to know that UV rays can get through to the ground, even on a cloudy day. Altitude: More UV rays reach the ground at higher elevations. Distance from the equator (latitude): UV exposure goes down as you get further from the equator. This is less of a factor near the equator. Season of the year: UV rays are stronger during spring and summer months. Time of day: UV rays are strongest in the middle of the day, between 10 am and 4 pm. The strength of the sun’s UV rays reaching the ground depends on a number of factors, such as: (To learn more about the different types of UV rays, see Ultraviolet (UV) Radiation.) What affects UV exposure? UVB rays have more energy and are a more potent cause of at least some skin cancers, but both UVA and UVB rays can damage skin and cause skin cancer. The main types of UV rays that can affect your skin include UVA rays and UVB rays. People who get a lot of exposure to UV rays are at greater risk for skin cancer. Most of this exposure comes from the sun, but some can come from man-made sources, such as indoor tanning beds and sun lamps. Most skin cancers are caused by too much exposure to ultraviolet (UV) rays.
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