What is the red sky in Nanning in the morning?

First, the sky in Nanning is red in the morning because of sunrise;

2. Sunglow is a natural phenomenon. In the morning, the sun rises in the east. If there is too much water vapor in the atmosphere, some short-wavelength blue light, blue light and purple light in sunlight are scattered by the atmosphere, and only red light, orange light and yellow light penetrate the atmosphere, dyeing the sky red and orange, forming a morning glow.

The morning glow and sunset glow are caused by the scattering of light by air. When sunlight enters the atmosphere, it will scatter when it meets atmospheric molecules and particles suspended in the atmosphere. These atmospheric molecules and particles themselves do not emit light, but because they scatter sunlight, each atmospheric molecule forms a scattered light source. According to Rayleigh scattering law, light with shorter wavelength such as violet, blue and cyan in the solar spectrum is most easily scattered, while light with longer wavelength such as red, orange and yellow has stronger light transmission ability. So we see that the clear sky is always blue, while the light above the horizon is only yellow, orange and red with longer wavelengths. After these rays are scattered by impurities such as air molecules and water vapor, the sky there will be colorful.

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