5 Facts About UV Exposure Through Clouds and Glass

Standard glass blocks UVB rays but not UVA rays UVB rays cause immediate burning, but UVA rays pass through glass and contribute to long-term skin aging and damage.

Car windows and non-tinted glass offer little UVA protection Sitting in a sunny car or near a non-tinted window can still expose you to enough UVA to cause burns over time.

Up to 80% of UV radiation reaches the ground on cloudy days Thin clouds block almost no UV, and thick clouds only reduce some UVB while UVA passes through easily.

Surprise burns happen on overcast days People stay outside longer on cloudy days because they feel safe, but UVA exposure adds up and can still burn.

Your skin needs protection even when the sun is hidden UV rays don’t take a break, so sunscreen or protective clothing is necessary regardless of cloud cover or being indoors near windows.