Uv rays can pass through clouds and glass.
Uv laminated car windows.
And toyota switched to laminated glass for the front windows of.
Some automakers like hyundai and kia are already using higher spf glass not only because it protects against uv rays but also because it helps cool down the car and thus improves fuel efficiency.
However uva transmission depends on the type of glass.
The problem though is that windshields only protect the front side of your face.
The side window of your car is made out of a different type of glass tempered glass.
Laminated glass is made from laminated plastic between two layers of glass which is known to block 98 99 of all uv light.
Uv radiation levels are generally much lower inside the vehicle than outside in full sunlight.
Laminated glass used for windscreens and tempered glass usually used for side and rear windows both block uvb radiation.
This exposure may prove especially damaging to long distance drivers.
Side and rear windows which usually have only a single layer of tempered glass may only block about 65 percent of incoming uv rays.