What is the cause of sandstorm weather? The sky turns yellow and dark.

This is not reflection, but refraction, because there are many tiny particles in the sky, such as soil and sand, and light must be refracted before it can reach the ground. Because of the long wavelength of yellow light, it is easy to bypass obstacles. When it reaches the ground, there are more yellow light, while the wavelength of red light is not easy to bypass, so many of them are reflected back into space. In fact, we can usually see objects because of their refracted light.