- There are two subtypes of UV light that reach the Earth's surface -- UVA and UVB. UVB is the most damaging of these subtypes.
- UVB light penetrates into the epidermis (upper layer of the skin), reacts with and damages the DNA of the cells there, and causes sunburns. 
- UVA light also increases skin cancer risk but in a different way. UVA light accelerates skin aging and decreases skin elasticity by damaging the collagen scaffolding in the dermis (a deeper layer of the skin).

University of Michigan - Ann Arbor

- According to the AACR, 1 in every 20 US cancer cases are caused by UV (ultraviolet) radiation. 
- According to the Skin Cancer Foundation, UV exposure causes over 85% of all skin cancers; to reduce UV exposure,
     - Seek shade (especially from 10 AM to 4 PM)
     - Avoid indoor tanning.
     - Wear clothes that cover your arms and legs.  Wearing a wide-brimmed hat and wrap-around sunglasses also helps cover your body.
     - Apply adequate sunscreen, with an SPF ≥ 15 (ideally ≥ 30), at least 30 min before going outside (even if it's cloudy). Reapply every 2 hours. Also, reapply after swimming or heavy sweating.

Content above copied nearly verbatim from Cancer Tutorial | Sai Chengalvala


Cancer Prevention | Limit Unnecessary UV Exposure

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