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Here in British Columbia we often have sunsets that are not red.
These are the best ones to watch to see the green flash. In all
cases the air is present, but it doesn't suffice to produce red
sunsets. Dan gives the conventional explanation for the blue of
the sky which I agree is due principally to scattering from the
molecules of air. The question asked pertained to red sunsets,
and the target audience is a biology teacher. I, too, love the
physics, but in this case one must also try to match impedance.