I went on a camping trip for 3 days and never used sunblock. The whole time I never got a sunburn until I rode the bus home. I got sunburned through the closed window on the bus. It was only my arm that was near the window that was burned, nothing else. I've always heard that you can't get a sunburn through glass, but I did.
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I know about uva that can go through glass, but why didn't I get burned before I got on the bus?
It could be many things. The UV index could have been lower during your camping trip, you were in less direct sunlight (maybe you were in the shade?). Sunburn isn't always immediate too. It can take as long as 6 hrs for redness/pain to show.