A new study published in the online version of the Journal of American Academy of Dermatology suggests that individuals in the USA are more likely to develop skin cancer, such as melanoma and merkel cell carcinoma on the left side of their bodies. And, researchers say that driving may be to blame because the left arm receives more UV exposure.
In countries where people drive on the opposite side of the road, the right arm gets more exposure. A 1986 study found that Australian men were more likely to show precancerous growths on the right side of their bodies.
Car windows will block the majority of UVB rays, but UVA rays can penetrate glass and can damage skin over time. For this reason, it may be prudent to apply sunscreen while driving, especially if you drive frequently.
Look to Anthelios sunscreens, Ombrelle sunscreens or Keys Solar RX for broad spectrum UVA/UVB protection that can help.