Obligatory xkcd: "Sky Color" https://m.xkcd.com/1145/ Obligatory xkcd[2]: "Rayleigh Scattering" https://m.xkcd.com/1818/ Others?
The "Rayleigh Scattering" comic is really spot on. Air is blue. The reason air is blue is blah blah blah physics, see the article we're all commenting on, but at the end of the day air is blue. We don't demand the same elaborate physics questions for why a ripe banana peel is yellow.
The sky is not blue for the same reasons that a banana is yellow.
But the reasons behind color in both cases is interesting regardless.