The sun is white, as pictures taken from space can prove https://upload.wikimedia.org/wikipedia/commons/8/83/The_Sun_in_white_light.jpg It appears yellow because the gases in the atmosphere all absorb and reflect different parts of the visible light, and the part that reaches our eyes after all that is similar to yellow.
But other gases in the atmosphere can change the color it appears to be. Like large fires, even where there’s no obvious smoke in the sky, will make the sun appear red. Even though you can’t see it, the materials put in by the fire are enough to absorb a bit more of the color.
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