Explain why some people think that indirect sunlight will not cause skin damage?

When there are clouds or a window in between us and the sunlight, it's common to believe that all the ultraviolet radiation from the sun will be blocked.When there are clouds or a window in between us and the sunlight, it's common to believe that all the ultraviolet radiation from the sun will be blocked. A large amount of the UV radiation is blocked, but we often make the mistake of staying outside longer on a cloudy day and getting sunburned.