I've been meaning to add tinting to my side windows to prevent skin cancer. Here is a quote and link that we should be mindful of: "Window glass can effectively block UVB rays, while the windshield is typically treated to block UVA rays. But the car’s rear and side windows will allow UVA rays to come through and do damage to your skin. That is where an effective and high-performance window tint comes in handy. The latest research has revealed that window tinting and the prevention of skin cancer are closely correlated."
Skin Cancer Facts: Does Window Tint Prevent Skin Damage From The Sun?