Sunset is at end of day, when sun has caused evaporation of water, smog and other pollutants are airborne from the day’s transportation and industrial output. All those vapors and particles in the air refract the sunlight to make the colors of the sunset. At sunrise, it’s cooler and the moisture has settled out of sky, there are fewer pollutants and such created overnight, so fewer particles in sky for sun to refract off of.
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