The most abundant form of environmental electromagnetic radiation is sunlight. The sun emits a broad spectrum of radiant electromagnetic energy. Frequencies in the visible light range penetrate the atmosphere and allow us to see. Radiation at frequencies just above the violet, or high-frequency, end of the visible light spectrum can have important health effects. Such ultraviolet radiation can cause acute sunburn. Chronic exposure to ultraviolet radiation prematurely ages the skin and increases the risk for skin cancers. Sunlight-related injuries are an important problem for agricultural workers because of the need to work outdoors.
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