“People who wear masks give it to people who are busy outdoors: This is Beijing's smog particles collected today. They have complexes, there are biological particles, there are minerals, all sorts of things. Microscope 1000 times (visual ) shooting, the last one is taken at 250 times."

From March 23rd to 27th, Beijing continued to haze and the pollution continued to increase. On the 27th, the AQI index maintained at around 400 for a long time. What are the tiny particles of helium in the air? User @ zhangchao _ shakes the particles by a microscope 1000 times and finds that they have different shapes, complexes, biological particles, and minerals. shocking.