Why is the sky yellow when there is a sandstorm and blue when it is sunny? What does this have to do with atmospheric scattering?

During the sandstorm, things like sand and loess spread into the atmosphere, so the sky was "dyed yellow"

The light of the sun is scattered, and the blue light is scattered around the atmosphere, so it becomes blue.

Reference (this is good):

When the weather is clear, there will be many tiny dust, water droplets, ice crystals and other substances in the air. When sunlight passes through the air, long-wavelength red light, orange light and yellow light can penetrate the atmosphere and directly hit the ground, while short-wavelength colors such as blue, purple and indigo are easily blocked by particles suspended in the air, thus scattering light in all directions and making the sky appear blue.

In fact, the scattered blue light is only a small part, and most of the blue light and purple light that have not encountered particles still hit the earth directly, so the white light that hits the earth is still red, orange, yellow, green, blue, indigo and purple.

Have you noticed that the sky will become bluer after the heavy rain? The clearer the weather, the bluer the sky. This is because there are a lot of dust particles, water droplets and ice crystals in the air in such weather.

Besides, it belongs to geography.