The blue sun appears in Beijing. What caused it?

First, the world of specific events is full of wonders, but perhaps because of this, the world is even more wonderful. On March/March/5th, 2002/KLOC-0, dusty weather occurred in many places in the north, and the concentration of PM 10 in the air was as high as 600 μ g/m3, which was actually a serious pollution. Moreover, this dusty weather affected a large area and the intensity was relatively large. In this kind of weather, some careful netizens found that the sun in the sky has become somewhat different, and its color has changed from bright gold to soft blue. This scene is like watching the sun from Mars, which makes many netizens very novel. Related? Blue sun? The topic of "Mars" also quickly reached the hot search, and many netizens expressed their opinions. Interestingly, netizens ridiculed that this day was the first day of landing on Mars.

Second, the reason for this phenomenon appears after dusty weather. I believe many netizens know that this scene is closely related to dusty weather. What is the specific reason? The chief astronomical analyst of China Weather Network explained this, saying that this is because the particles in the dust can absorb the red light with longer wavelength and scatter it, while the blue light with shorter wavelength is not affected much. In this case, the red light will be greatly reduced, while the intensity of blue light will be greatly increased, so the sun we see at this time will appear blue.

As for seeing the sun appear blue on Mars, it is because of carbon dioxide. The atmosphere of Mars is actually very thin, but its carbon dioxide content is as high as 96%. These carbon dioxide can effectively absorb long-wavelength light, such as red light, while short-wavelength blue light is retained, so the sun will appear blue.

Third, the protection of dusty weather, although? Blue sun? It's novel, but the impact of dusty weather on people can't be ignored. Dust weather will bring a lot of particles, cause air pollution, easily affect people's respiratory system, and also affect people's normal travel. Therefore, when there is dusty weather, we should pay attention to personal protection to reduce the adverse effects caused by this weather.

If such weather occurs, try to stay in the residence, close the doors and windows in time, and sometimes seal the gap to prevent particles from flying into the residence. In addition, dust should be cleaned in a wet way to prevent indoor dust from being suspended in the air again. You can also sprinkle water indoors or turn on the humidifier to keep the humidity of the indoor air. If you must go out, use protective tools such as masks, goggles, hats and scarves. After arriving at the destination, you need to wash your hands and face and change clothes in time.