For everyone who is going to be out in the sun this summer: I did some internet research to find out what the best tips are for avoiding sun damage and skin cancer.
According to the University of Alabama Birmingham, sunblocks with an SPF of 15 block 92% of the UVB rays, while SPF 30 blocks 97%UAB report,
According to Consumer Reports, you should use a sunscreen that has an SPF level of at least 30 or higher and one that water resistance. And most importantly, make sure that the sunblock you use protects from UVA and UVB rays. Here is the entire article:
Another tip: even if you are using the required sunscreen, STAY IN THE SHADE (better safe than sorry). And on the flipside, wear sunscreen even in the shade. Radiation remains in the atmosphere after bouncing off the earth's surface and can build up in the atmosphere on a cloudy day
Here are some more helpful links
National Cancer Institute