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Ultraviolet A (UVA) light is one of three types of UV light. It comprises the UV light band. The sun emits UVA light naturally. Commercial tanning bed bulbs and indoor tanning bed bulbs, as well as by other consumer and commercial devices also expose UVA light to people's skin.
The ozone does not absorb UVA light. Unlike UVB and UVC rays, UVA rays penetrate deep into the skin. Overexposure to UVA light can contribute to premature aging. However, UVA has also been proven to provide relief for some conditions such as psoriasis when used in a controlled manner.