How many kindergartens have smog reached, and primary and secondary schools stop outdoor physical education class and outdoor activities.

Hello, the smog level has reached the blue warning (level 4), and it is recommended that the school reduce students' outdoor activities; Yellow warning (level 3) schools should reduce outdoor activities such as physical education class, recess practice and running; Orange Warning (Grade II) schools should stop outdoor sports such as physical education class, group gymnastics and running; Red Warning (Level I) Primary and secondary schools and kindergartens are temporarily closed.

At school, teachers should tell children or students some precautions in foggy days, such as minimizing outdoor exposure time, reducing window opening and wearing masks when going out. For the choice of masks, because the children in kindergarten are younger and have sensitive skin, you can choose the kind of breathable cotton masks, and non-woven fabrics may cause allergic symptoms. Primary and secondary school students exercise a lot, and when the degree of smog is not the most serious, the school may still carry out outdoor courses. Therefore, it is best to give them the kind of nasal congestion that is directly stuffed in the nostrils, that is, the invisible mask. Don't worry about holding your breath, you can wear them on any occasion, so that they can be protected indoors and outdoors.

In addition, at home, parents should prepare lung-clearing food for their children and remind them to drink more water and eat more fruits and vegetables.

The above is just my humble opinion, I hope I can help you!