Outside the mountain, when will the haze in my hometown stop. What are you most concerned about this winter? Smog! Recently, smog has occurred frequently in many places in my country, and Beijing-Tianjin-Hebei and surrounding areas have become "severe disaster areas" again ". With the sound of early warning, the anti-haze war is on the verge of breaking out. Up to the government to limit travel, limit emissions, shut down enterprises, industry, energy transformation, down to people masks, purifiers, green travel, check driving posture. This nationwide "war of resistance" was launched vigorously.

We have no way to trace the origin of smog, and we only know this term in recent years. Maybe there was before, but it didn't attract attention or simply thought it was fog. And all this, in the NASA spectrometer is not hidden.

This is a 2001 NASA spectrograph in North China, when only a large number of aerosol pollution. Beijing issued its first "red alert" for air pollution in 2015 ". The smog has extended hundreds of kilometers southwest from Beijing to the low-lying areas of the Guanzhong Plain near Xi'an in Shaanxi province. Just as the formation of smog, its governance is also a long-term process. In the midst of anxiety, people can't help but ask, can you predict smog like the weather?

　　Scientific InstrumentsIn fact, there has always been a mysterious family behind the weather forecast. They monitor the world's fickle winds, clouds, rain, snow, and weather, and they are weather satellites. Among them, the Fengyun-3 satellite is equipped with 12 remote sensing instruments with multi-spectral bands such as ultraviolet, visible, infrared, and microwave, which can monitor 55 fields such as atmospheric temperature, humidity, clouds and aerosols, atmospheric composition, land surface, and sea surface. Haze monitoring can be achieved through him. At the end of 2016, Fengyun 4 was launched, and the observation data of its hyperspectral resolution imager can retrieve the optical thickness of atmospheric aerosol and monitor the spatial and temporal changes of haze.

Also at the end of 2016, with the development of China's scientific instruments, the first global carbon dioxide monitoring scientific experimental satellite was also successfully launched, carrying a hyperspectral and high spatial resolution carbon dioxide detector and a multi-spectral segment cloud and aerosol detector, which can measure auxiliary information such as clouds and atmospheric particulate matter, and provide important data support for the study of the causes of atmospheric pollution (haze) such as PM2.5.