What is the scientific basis of "a thousand miles away at sunset and not going out at dawn"?

In summer morning, the air at low altitude is stable and there is little dust. If there was a bright red glow at that time, it was called sunrise. This means that there are many water drops and clouds in the eastern low altitude. With the rising of the sun, the thermal convection will gradually develop flat, the clouds will gradually become dense, the bad weather will gradually approach, and the local weather will get worse and worse. This is the truth of "don't go out at dawn"; At night, due to the sunshine heating in one day, the temperature is high, and there is generally not much water vapor in the low-altitude atmosphere, but due to the weakening of convection, dust may be concentrated in the lower level in large quantities. Therefore, if there is a bright sunset glow, it means that the sunset glow is mainly caused by the scattering of solar light by dry particles such as dust, which means that the weather in the west is relatively dry. According to the law of airflow moving from west to east, the local weather will not get worse in the future, so there is a saying that "the sunset clouds travel along Wan Li Road".

Of course, "Don't go out at dawn, go to Wan Li Road at sunset" is a universal law, and there are exceptions. For example, when the sun has fallen below the horizon, the glow on the horizon should disappear, because there are clouds below the horizon, and the glow below the horizon is reflected by the bottom of the clouds, but it can show a rouge red. The more impurities in the air, the closer the color of the sun is to carmine. This shows that there are clouds under the western horizon and the air is very humid and turbid, which indicates that the weather will get worse. Therefore, there is a saying that "there is no carmine in the day, and there is no rain in the wind".

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