What does it mean for the sky to turn yellow?

1. The yellowing of the sky is generally a precursor to heavy rain, which is normal for the natural phenomenon of wind, rain and lightning, and will not be a precursor to an earthquake.

2. The yellowing of the sky is the effect of mirror and spherical reflection such as refraction, reflection and scattering of rain.

3. Rainwater turns yellow, which may be affected by local air quality. As we all know, clouds are not as clean as they seem. They are composed of dust and water droplets, and the air under the clouds is still full of a lot of dust and water droplets, but it is not the age of human eyes. When precipitation forms, after neutralizing these dust spirits, the falling rain will be affected by the local soil, and the colors are yellow, red and black. I can't emphasize it too much.

4. The sky and rain turn yellow, which may be a rare natural phenomenon caused by sandstorm accompanied by rainfall.

5. Another: natural disasters such as "acid rain" that may be caused by atmospheric hazards.