What is ultra violet radiation given off by?

UV radiation is given off by the sun. UV radiation is a broad spectrum that consists of UVA, UVB and UVC radiation. The planets atmosphere protects us from harmful UVA and 90% UVB radiation, leaving unharmful UVC radiation to pass through the atmosphere. However, due to the increasing number of greenhouse gases, Ozone is being broken down a lot faster than it should, which in turn means that more harmful UV radiation can come through, which means that we are at a higher risk of cancer.