It is best not to close all the windows at night, but to leave a ventilation window to ensure indoor ventilation and fresh air, which is beneficial to people's health. Of course, you should also pay attention when you open the window in winter, so that people will not catch cold when they sleep. The best way is to leave a small crack. In addition, we should pay attention to safety issues, and do not open windows in special weather such as sandstorm and fog.

Because people will inhale 300 ml of oxygen and exhale 250 ml of carbon dioxide every minute after falling asleep. If you sleep with the doors and windows closed at this time, there will be no ventilation indoors, the indoor oxygen will gradually decrease, and the carbon dioxide will increase sharply, especially in crowded rooms.

The way to open the window is very particular.

Opening hours: 8 am-1 1 pm, 3 pm-3 pm 16 pm. During this period, the atmospheric diffusion conditions are good, the concentration of pollutants is low, and the ventilation effect of window opening is good. Among them, around 10 in the morning and around 3 pm are the best time to open the window for ventilation.

Window opening time: ventilation for 20-30 minutes each time. If the window is just a small crack, the ventilation time will increase to 30 minutes ~ 1 hour.

Window opening times: 3 to 4 times a day is enough. Opening windows often or for a long time will reduce indoor air quality.

Window opening method: The best window opening method should be to open the two farthest vents in the room. Let the air in and out, form convection, run through the whole room, and make the air look brand-new.