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There are no colors being beamed onto the Earth through or from the atmosphere. The atmosphere itself doesn’t have any color at all. What we see in the sky when we look up in to the clear “blue” sky, or are awed and amazed by beautiful sunrises and sunsets are light waves reflected off of dust particles and air molecules. Not terribly romantic, but if you should still be able to appreciate the beauty. The size of the wavelengths determines the colors that we see. The blue sky comes from the shorter wavelength of the violet and blue waves. These shorter waves are scattered more efficiently and effectively than the still present but much less visible red and orange colors. The amount of water vapor in the sky determines the depth of the color. Less water vapor creates less of a veil over the sky and therefore the blue light shines clearly through, making it a brighter blue color.