Actually, the amount smoke, haze, particulates, smog, even humidity in the atmosphere change the color of the sky. More particulates mean more color. Smoky or smoggy skies sadly make for awesome sunsets. read more
Date: November 15, 2007 Source: University of Wisconsin - Madison Summary: The colors of the sunset result from a phenomenon called scattering. Molecules and small particles in the atmosphere change the direction of light rays, causing them to scatter. read more
But because we can’t see violet very well, the sky appears blue. Scattering also explains the colors of the sunrise and sunset, Ackerman says. “Because the sun is low on the horizon, sunlight passes through more air at sunset and sunrise than during the day, when the sun is higher in the sky. read more