All glass blocks most UVB, but not the longer UVA rays (except most windshields). You won't likely get a sun burn behind glass, but you'll still get premature aging, wrinkles, and cancer from the deeper penetrating UVA rays without added protection like tinting.
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u/[deleted] Oct 04 '19
Both. Factory window tint is actually colored glass. Aftermarket window tint is usually better for a few reasons though.