Ultraviolet (UV) radiation, particularly from the sun, is another significant physical carcinogen. UV radiation is divided into three types: UVA, UVB, and UVC. UVA and UVB are the most concerning for human health. UVB radiation, in particular, can cause direct DNA damage, while UVA generates ROS that indirectly damage cellular components. Both types of damage can initiate skin cancers such as melanoma, basal cell carcinoma, and squamous cell carcinoma.
