Daily Archives: March 7, 2014

Why sunburns happen on cloudy days…and more!

What is the buzz about UVA these days? We now understand that UVA (in addition to UVB) contributes to skin cancer development.  On a summer day, UVA accounts for >95% of the UV light reaching the earth’s surface, while UVB accounts for just 4%.  The ozone layer and atmosphere block essentially all UVC light emitted by the sun and nearly […]