Why are the light colors different at sunrise and at sunset?

Answer 1

Dust and air molecules preferentially scatter blue light away from the light of sight to the sun, leaving mostly red coming from that direction (and blue elsewhere). The lower it is in the sky, the more atmosphere it has to pass through.

Inidentally, re other answer, Mars is red because of the high iron oxide content of its soil.

Answer 2

Dust in the atmosphere can by scattering produce very interesting sky colours. The redness of Mars is due to lots of dust in its atmosphere. At Earth, during the day, activity on the ground stirs up dust into the air, which scatters the light when we see it at sunset. At night the dust settles, so we see less scattering by dust in the morning at the sunrise, so different colours in the sky.

Answer 3

It is all the same, but what you see when the sun rises may have a different moisture and chemical quality (over a city, or a forest or desert) in the east in morning, than in your west in the evening. The day is different from one hour to the next and the wind and moisture and dust and pollution all keep changing with respect to clouds and the colors of the day.

Answer 4

The ground temperature is generally cooler in the morning giving rise to fewer convection currents.