What is meaning SM below Airport Information / right after wind data

Hi what ist meaning the SM Information on the map right after weather data at the Airport? And why get some airports red?image

SM: Statute Miles
Red airports means there’s very low visibility.

Here’s more information about airport dot colors.

Is it allowed to land there or are these closed ?

With autoland it’ll be easy to land but if you’re gonna fly it manually, it’s probably a bad idea.

And the SM are indicating the visibility in statut miles right ?

Yes, you’re right.

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Thanks a lot :-)

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