How does Mars get its blue sunsets and red skies?

Mars has a very thin atmosphere, mostly carbon dioxide, loaded with fine dust particles. During the day, sunlight scattered by the dust gives the sky a hazy reddish or tawny color, while at sunset the shorter blue wavelengths are scattered toward the observer, creating a blue glow around the Sun. NASA’s rover cameras have captured these unusual twilight colors directly on Mars. The effect is different from Earth’s blue daytime sky because Mars’s air is much thinner and its dust plays a bigger role. These colors are a clue to the planet’s dusty, dry climate.