Why Does Setting Sun Appear Red?

The scene of setting sun is observed by thousands of people on daily bases.Sometimes it looks so romantic and beautiful that it touches the heart. Many people are so inspired by that beautiful phenomenon, that's why, they go to sea side or any other open place just to enjoy the sun set.
 But the question is, Why it appears red, when it going to be set.

 Technical reason of being red at the time of setting sun:

image source Deviant Art

The setting sun appears red as it approaches the horizon because of the scattering of light by very minute particles of dust or smoke near the surface of earth.At noon the sun is overhead whereas it is near the horizon  at the time of  sunrise or sun set. A ray of light has to cover a greater distance through the atmosphere in later case. Component colors of sun light have different wave length. The longest wavelength is of Red light. The minute dust particles suspended in the air can scatter colors of short wavelength only, like, blue and violet. While the red color that is of longer wave length, able to pass through the atmosphere and does not scatter. That's why, the setting sun seems red.