In order to maintain indoor air circulation, open the windows for ventilation no less than once a da

15-20 minutes at a time is sufficient.

Opening windows for ventilation can make people get more "air vitamins, that is, negative ions."

It can increase the body's resistance and prevent diseases. In the cold winter, open the windows every day for ventilation, preferably once in the morning, noon and evening, for 15 to 20 minutes each time. There are two pollution peaks and two relatively clean troughs in the urban atmosphere during the day and night.

The two peaks are generally around sunrise and in the evening, so it is best to open the window at 9 a.m. to 11 a.m. or 2 p.m. to 4 p.m.

Because during these two periods, the temperature has risen, the harmful gases in the bottom layer of the atmosphere have been dissipated, and the effect of opening windows for ventilation is better. Even on smog days, open the windows for ventilation, and you can open a small slit in the windows of each room to ventilate. Generally speaking, between 1 p.m. and 4 p.m. every day, the atmospheric diffusion conditions are relatively good, and the pollutant concentration is low, which is the best time for ventilation.

Background

According to statistics, nearly half of the world's people are exposed to indoor air pollution, which has caused respiratory diseases, 22% of chronic lung diseases and 15% of bronchitis and bronchitis.

and lung cancer. The number of excess deaths caused by indoor air pollution in China has reached 10,000 per year, with an average of 304 per day, 4.3 million excess emergency visits, and direct and indirect economic losses of US$10.7 billion.

Hello, in order to maintain indoor air circulation, open the windows for ventilation no less than once a day, and not less than 30 minutes each time.

I think the weather is cold in winter, and I get up every morning and open the window, at most half an hour, because now there are many cars, and there is pollution in the air, so try to open the window in the morning, and don't need to open the window frequently, and release all the heat accumulated in the house.

This is best to ventilate twice, there are ten minutes in the morning and noon, and the heat is not released when it is cold for too long in winter.

The air is first ventilated by opening the window, and the window is ventilated every day, each time. （）a.≥1，≥30

b.Let God Mill 1, Tan Dou 60

c.2, 30 (correct answer).

d.≥2，≥60

Opening the window for ventilation every day is conducive to the freshness of the room air, and at the same time can reduce the chance of people being infected with bacteria and viruses, but many people are not very clear about the correct way to open the window for ventilation, such as how many times a day to open the window for ventilation?

Open windows to ventilate at least how many times a day.

It is best to open the windows for ventilation three times a day in the morning, noon and evening.

It is recommended to open the window for ventilation three times a day in the morning, noon and evening, 30 minutes at a time, if the room is small, there is wind or cooler outside, the time to open the pure side window should be shorter; If the room is large, and there is no wind or warmth outside, the window should be opened for a longer time. In an 80-square-meter house, for example, in the absence of wind or breeze, opening the window for about 20 minutes can reduce the pathogenic microorganisms by 60%.

When to open the windows every day for ventilation.

The window opening time is 9:00 a.m. to 11:00 a.m. or 2:00 p.m. to 4:00 p.m.

Because during these two periods, one is to avoid the dirty air quality environment caused by automobile exhaust during the rush hour; Second, the temperature has risen at this time, and the harmful gases gathered at the bottom of the atmosphere have been dispersed.

However, it should be noted that friends with pollen allergies in spring should not often open the windows for ventilation, and it is better to consider using air conditioners for ventilation.

Is it good to open windows for ventilation 24 hours a day?

Not good. Although opening windows for ventilation is very beneficial to health, if the windows are opened for ventilation 24 hours a day, first, the outside temperature is low, and it is easy for people to catch a cold when ventilation cold air enters at night; Second, in the event of weather changes, such as haze, strong winds and other adverse weather conditions, it is easy to pollute the air outside the room; Third, during the peak period of commuting in urban air, car exhaust will reduce air quality, and opening windows for ventilation is harmful to the human body.

What are the benefits of opening windows for ventilation.

Opening windows frequently for ventilation can have the following benefits:

1. Open windows for ventilation can effectively use sunlight and ultraviolet rays in the air to kill germs, remove harmful gases in the indoor air, and purify the air.

2. Frequent ventilation can keep the hail pants and quilt from becoming damp and avoid the breeding of mites and mold.

3. Ventilation and fresh air can improve the body's immunity and reduce respiratory diseases.

What are the hazards of ventilation without opening windows.

If the room is not ventilated by opening the window, it will have the following hazards:

1. The indoor harmful gases increase, the carbon dioxide content increases, the harmful gases produced by smoking cannot be discharged in time, and the indoor air is turbid.

2. The humidity in the living room is high, which is easy to make all kinds of furniture and food moldy and rotten.

3. If you don't open the window for ventilation, it will increase bacteria and germs in the air, making people easy to get sick and feel bad.

1. Generally speaking, the time for opening the window for ventilation is best not less than 15 minutes, but this bottom line time will also change according to the size of the room and the speed of air circulation, but generally speaking, 30 minutes can completely circulate the indoor air, so the time for opening the window for ventilation should not be less than 15-30 minutes every day.

2. In the case of a 20 difference in indoor and outdoor temperature, it takes 9 minutes for an 80 cubic meter room letter beam to be completely ventilated; If the difference between indoor and outdoor temperature is 15 minutes, it takes 11 minutes to open the window; If the temperature difference cannot be accurately grasped, 30 minutes of window opening is sufficient.

3. The window opening time is 9:00 a.m. to 11:00 a.m. or 2:00 p.m

00 4:00 is preferred. Because during these two periods, the temperature has risen, the harmful gases that have accumulated in the bottom of the atmosphere have been dispersed, and the effect of opening windows for ventilation is better.

Of course, the wind speed should not be too fast when opening the window for ventilation, and it should not exceed the meter second. From a sensory point of view, at such wind speeds, the human body does not feel that the air is sliding in a significant flow.

115-30 minutes.

It is best not to open the window for ventilation for less than 15-30 minutes a day, and it is best to open the window for ventilation every day, so as to help the circulation of indoor air, but it should also be noted that the window ventilation is best when the air condition is better, if it is a rainy day or a haze day, it is recommended not to ventilate.

Generally speaking, it is best to open the window for ventilation for less than 15 minutes, but this bottom line time will also change according to the size of the room and the speed of air circulation, but generally speaking, 30 minutes can completely circulate the indoor air, so the time for opening the window for ventilation should not be less than 15-30 minutes every day.

2 a.m. 9-10 p.m. and 3-4 p.m.

The best time to open windows for ventilation is at 9-10 o'clock in the morning, and at 3-4 o'clock in the afternoon, because the temperature is in a state of increase or due to high temperature in these two time periods, the countertroposphere phenomenon has disappeared, and the harmful gases deposited in the bottom layer of the atmosphere have been dispersed, so relatively speaking, the air in this time period is relatively fresh, and it is more suitable for opening windows for ventilation.

However, it should also be noted that 9-10 a.m. and 3-4 p.m. are only a time period, not a fixed time, so it is also necessary to make a decision based on the actual situation at that time.

3. It is recommended to do 2-3 times, but it can be changed according to the actual situation.

Generally, it is recommended to open the window 2-3 times, because there are changes in the breathing, activity and environment of people indoors, and there will be a certain amount of harmful substances in the air before accumulating before the accumulation of branches, so it is necessary to open the windows regularly to circulate the air. In 24 hours a day, it is best to open the window to ventilate the air 2-3 times, and the time of each circulation should not be less than 15 minutes. If there is a change in personnel, increase or decrease and some activities that have an impact on the indoor air, the window can be adjusted according to the actual situation of the indoor air.

4 Convection is required, but pay attention to the method.

Only by opening windows to ventilate air convection can it be more conducive to air exchange, so as to realize the circulation of indoor air and achieve the effect of air purification. When opening the windows for ventilation, all the windows should be opened, so that the indoor air will be convection, and the circulation effect will be more, so that it only takes about 15 minutes to achieve air purification.