Low - UV levels between 0 and 2.4 tend to affect very few individuals among the sensitive skin-suffering public.
Low-Medium - UV levels between 2.5 and 4.8 tend to start affecting individuals extremely sensitive to the exposed sun.
Medium - UV levels between 4.9 and 7.2 will likely cause symptoms for many individuals who suffer from sensitive skin, including redness and swelling of exposed areas.
Medium-High - UV levels between 7.3 and 9.6 tend to affect a large number of individuals who suffer from the sensitive skin heightened by sun exposure.
High - UV levels between 9.7 and 12.0 tend to affect most individuals who suffer from the sensitive skin exposed to the sun. Symptoms such as sun burn or redness may become more severe during days with high UV levels.