How effective are windows and window tints at UVR protection?

Although most cars provide substantial shading for the occupants, significant glassed areas create the potential for UVR exposure. Laminated windscreens, which consist of a tough plastic layer bonded between two panes of glass, typically have UPF ratings of 70 or higher. However the UPF of plain window glass as used in car side windows is usually about 15 or less. The amount of UVB radiation transmitted through plain window glass differs markedly between glass types, however most types transmit about 60% of the UVA. This means that a person sitting in a car where the sun can reach them may still suffer UVR exposure.

Most automotive window tints absorb a significant amount of UVR and provide excellent protection. Some tints appear clear to the human eye but strongly absorb UVR. Wearing sunscreen whilst driving is an effective way of preventing sunburn.