Will my skin tan through glass?

Yes, ordinary glass cannot isolate ultraviolet rays and cannot transmit ultraviolet rays well, but it does not completely prevent ultraviolet rays from passing through. Exposing yourself to the sun for a long time through window glass can still tan you. It won't happen if you put on anti-UV film or pull the curtains.

Umbrellas in daily life give people the impression that they can block the sun. In fact, 50% of ultraviolet rays can pass through the isolation of parasols and damage the skin. In fact, the same is true for glass. It can only isolate ultraviolet B, but ultraviolet A can penetrate the glass without any hindrance.

Many people think that sun protection is only necessary in summer when the UV index is high, but they are wrong! Because the ultraviolet index only represents the UVB content in ultraviolet rays. UVB will make your skin red and sunburned, but it is UVA that will really cause your skin to tan, appear spots, wrinkles, and age. It accounts for more than 98% of ultraviolet rays. It is the weakest but has super penetrability. It can make you tan unknowingly through glass or thin shirts, so don’t doubt that many people will tan in the rainy winter. To avoid getting tanned, you should wear sunscreen no matter it is sunny or rainy, indoors or outdoors except when sleeping (because indoor walls and glass can also reflect ultraviolet rays, and halogen lamps and fluorescent lamps used indoors also contain ultraviolet rays. ), and hold an umbrella or wear a hat when going out. To truly whiten your skin, prevention is better than treatment.

Ultraviolet rays are divided into UVA, UVB, and UVC waves. UVA waves exist in all seasons and can penetrate even through glass, so you can be exposed to the sun even in the house. UVB waves are stronger in summer and weaker in winter. , UVC waves are blocked by the ozone layer, so don’t worry about it, so we have to choose sunscreen products all year round, and choose sunscreen products with both SPF and PA values, because SPF blocks UVB waves, while PA blocks UVA waves. of.