Is it suitable to open or close the window in rainy weather?

Hello! It is best not to open the window in rainy days. When the weather is wet, many people will choose to close the doors and windows to prevent moisture from flowing in, but the indoor air is no longer circulating, which may easily lead to the growth of bacteria. The humidity of the air is the highest in the morning and at night. It is not recommended to open windows in large areas during this period. But if you want to open a window, you can choose to avoid the window facing south or southeast. In the south, there is more moisture in these two directions. In addition, in the afternoon or when the weather turns fine, the humidity is relatively low, so you can choose to open the window for ventilation during this time to blow away the humidity.

A few citizens think that they can stay away from germs as long as they open the window every day. In fact, ventilation itself can't kill germs, but it can blow harmful gases and even germs to the outside through air circulation, and dilute the content of harmful gases or germs in the room, thus indirectly achieving the purpose of air disinfection.

But just opening the window is not enough. When cleaning indoors, wet cleaning should be adopted to prevent dust from flying all over the room. In an air-conditioned room, always scrub the filter screen of the air conditioner to prevent contamination with germs, and at the same time pay attention to opening the window regularly for ventilation. For rooms with insufficient natural ventilation, using electric fans for ventilation or using air purifiers correctly is one of them.

Second, don't blindly rely on incense and ozone air filters. Experts said that these measures have no substantial effect on SARS, and smoked vinegar has no preventive effect on atypical pneumonia virus. If there are many guests at home, fumigate with peracetic acid after the guests leave. Many citizens also like to close doors and windows to increase the effect of drugs, but excessive closure will make the drug concentration too high. Therefore, after using disinfectant for 30 minutes, open the doors and windows for ventilation.

Third, turn on the air conditioner as soon as the weather is hot. Many citizens think that air conditioning itself has the function of circulating air, as long as it is sprayed with disinfectant regularly. But experts pointed out that this is very unfavorable for the spread and dilution of germs. After turning on the air conditioner, open the window regularly to ventilate. In addition, the longest duration of air conditioning cannot exceed 12 hours.

Three keys to ventilation

Although most citizens have the habit of getting up early and opening the window for ventilation, in the case of modern industrial pollution and increasing automobile exhaust, early morning ventilation may not be appropriate. Experts say that Shanghai is a city with relatively concentrated industries. Air pollution has two peaks, day and night, and two relatively clean valleys. The two pollution peaks are generally around sunrise and evening, and the two relative cleaning periods are at 10 am and around 3pm. Therefore, citizens can choose the window opening time according to the actual situation in their area, and it is best to avoid the two pollution peaks in the morning and evening, which is one of them.

Second, don't leave the door open all day. Experts believe that opening the window three or four times a day for 30 minutes is enough. Take the space of 100 cubic meter as an example. When there is no wind and the temperature difference between indoor and outdoor is 20℃, the air can be exchanged for about 1 1 min. The number of air changes can be determined according to your psychological needs. For working people, it is enough to keep the house ventilated.

Third, it is not advisable to open more windows on cloudy days. Under different climatic conditions, the choice of ventilation is also different. Clean up the pollutants in rainy and snowy days, and the pollutants are easy to disperse when it is windy. The air quality is high in this weather, so citizens can open more windows as appropriate. However, on cloudy days when the air pressure is very low, the inversion temperature coming back from the ground will not disappear for a long time, the pollutants will be difficult to dissipate, and even photochemical smog will appear. At this time, it is not appropriate to open the window and go outdoors.