Can You Catch a Tan Through Glass?

Harmful UVA rays can penetrate glass and cause tans and other skin damage.

According to the Skin Cancer Foundation, skin cancer will affect one in five Americans in their lifetime, so it is important to protect yourself from the sun's rays at all times --- even when you are indoors or in the car.

Sun Exposure Through Glass

It is possible to get a tan or sunburn through glass. Most tans are caused by UVA rays, which are present during all daylight hours and can penetrate glass. UVA rays damage the cells in the basal layer of the epidermis, which is where most skin cancers occur. UVA exposure is also the primary cause of premature aging and wrinkles. UVB rays, which are more intense than UVA rays, are responsible for most sunburns and skin reddening, but cannot significantly penetrate glass.

Treating Glass for Sun Protection

To protect yourself from sun damage, the Skin Cancer Foundation recommends adding UV-protective film to the side and rear windows of your car and, if possible, to the windows of your home and office. A protective film can block up to 99.9 percent of damaging UV rays and let in 80 percent of the available light. Some windows are manufactured with UV protection built in.

Sunscreen for Sun Protection

The Skin Cancer Foundation recommends that everyone use a broad spectrum sunscreen and an SPF of 15 or higher every day, regardless of whether you plan to be outside. A broad spectrum sunscreen will protect you from rays that can penetrate glass and cause skin damage.

References

• UV Information
• Sun Safety for Drivers