Paula Begoun in her book "The Original Beauty Bible" says:
UVB rays can’t get through glass, so there’s no risk of sunburn when you sit in a car or next to a window, but that’s the good news. The bad news is that UVA rays can get through windows. Normal glass doesn’t protect skin from UVA damage, so sitting in a car or next to a window that lets daylight through offers no UVA protection whatsoever.
You all know that UVA = Aging & UVB = Burning & Tanning.
That means that using a light dusting of spf 15 compact in the morning just because you spend only 5 mins in the sun is not enough. Once you reach office, you may not be tanning anymore but your skin is aging.
This really came as a shocker to me, as I always wipe off my sunscreen once in office. My floor does have really big glass walls (the side facing the road is completely tinted glass). While my desk is quite far away from it (about 10 ft) I still am surrounded on two sides by glass walls. I'm gonna keep that sunscreen on now & possibly stock a lotion in office to top up once I'm in.
Did you girls know about this? Do you also wipe off your sunscreen once in office?