What type of sunscreen can best reduce risk of melanoma? spf 4 used daily spf 4 used once a month spf 15 or higher used daily spf 15 or higher used once a month pl

Hey, I think it would probably be SPF 15 or higher used daily.

SPF 15 or higher im not sure please tell me if im wrong thanks

the ozone layer acts as a filter for the shorter wavelength and highly hazardous ultraviolet radiation (uvr) from the sun, protecting life on earth from its potentially harmful effects. when the sky is clear, there is an inverse relationship between stratospheric ozone and solar uvr measured at the earth's surface.