Myth: You Can Get a Tan Through Windows

Many people believe that they can get a tan while sitting inside near a window because they still feel warmth from the sun. This myth suggests that window glass allows ultraviolet (UV) rays to pass through, allowing people to tan or get sunburned indoors. The idea persists because people often notice their skin becoming warmer after sitting near a sunny window and associate this with tanning.

In reality, standard window glass blocks most of the ultraviolet B (UVB) rays responsible for causing sunburn and tanning. While UVA rays can penetrate glass and may contribute to skin aging over time, UVB rays, which are the main cause of tanning and burning, are largely blocked by most windows. This means that you cannot effectively tan or get sunburned while sitting inside next to a window. However, prolonged exposure to UVA rays can still increase the risk of skin damage and aging, as UVA radiation can penetrate deeper into the skin and cause long-term effects like wrinkles and age spots. Therefore, it’s important to protect your skin from excessive sun exposure by wearing sunscreen or protective clothing even when indoors. If you want to get a tan, it is best to spend time outdoors in direct sunlight, while being mindful of sun protection practices to avoid harmful effects like skin cancer.