Can we use 青空 and 青い空 interchangeably?
Is there any difference between the two? Which is the most natural?
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In this specific case, yes, 青空 and 青い空 both mean "blue sky". When used on their own, there is no surprising connotation and thus they are interchangeable. But 青空～ in a compound noun can mean "open-air" or "outdoor" (e.g., 青空教室 is not the same as 青い空教室).