Why Sky is Red in the Afternoon

In big cities like Jakarta it's hard to see the blue sky.
Carbon smoke pollution makes the sky filled with smog.
Only on certain days such as long holidays blue sky began to unfold.

This is different from that in areas where there is little pollution. Blue lags can still be found in everyday life.
Sunlight consists of several colors, each of which has different wavelengths.
Well, the atmosphere surrounding the Earth affects how each ray reaches Earth, because the wavelength meets the molecules, the dots of water, and a little dust.
Of those colors, blue has a short wavelength and particles in the air that blue blue around makes the sky look blue.
The red color has a longer wavelength, and moves stronger so it does not get too much.
What about the red color in the afternoon?
The sky tends to be red because the red light with the longest wavelength that can travel the Sun-Earth. (Life's Little Mysteries)