What is the colour of the wind?

I may consider it as a serious scientific question, in which case we must first consider "what is wind?".

Wind is the movement of air molecules. Can air molecules have color? If they have color can they have more than one color? Air molecules are colorless. However, air often has other molecules mixed in it (e.g. smoke). These other molecules often have 'color'. Thus, they impart a color to the mixture of air and smoke. If this mixture is 'blowing in the wind', then the air may be perceived to have color.

Having said that, I think that  question is really just meaningless.
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