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A. The sun produces invisible rays called ultraviolet-A (UVA) or ultraviolet-B (UVB) that can damage the skin. Too much sun can cause sunburn, skin texture changes, and skin cancers. Rashes also can be attributed to sunlight. Even on cloudy days, UV radiation reaches the earth and can cause skin damage.
The measure of outdoor UV exposure is difficult. The fraction of UV-A and UV-B is constantly changing due to solar elevation, angle, varying hourly and seasonally and also varies with the ozone level. Sunburn is the result of overexposure to the sun's ultraviolet radiation. Long-term cumulative sun exposure increases the risk of melanoma and non-melanoma skin cancer.