青空 蒼空 青い空 蒼天 蒼穹 碧空 蓝天

A sky which is blue.

This tag implicates sky. Don't use it for posts where the sky isn't a significant part of the image (Danbooru forum #162192).

See also

• grey sky
• orange sky
• pink sky
• purple sky
• red sky
• white sky
• yellow sky

• cloudy sky
• night sky
• day

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