Is the air inside really better than outside in haze?

In the face of smog days, the most common advice we see, and our most basic instinct, is: close the windows, travel less, and stay indoors. After all, if you open the window, it is really no different from sitting on Chang'an Avenue.

So, if you stay in the house and close the windows, will everything be fine? Probably quite a few people have similar thoughts. However, in reality, this is not the case.

As a result of confined spaces, the air flow is poor, the oxygen content of the room is reduced, and the associated pathogenic microorganisms are prone to breeding. It has been reported that in a closed room, after 5 to 6 hours, the indoor oxygen content decreases, E. coli increases, Rongochroma rubrum increases, diphtheria bacteria rises, and other respiratory harmful bacteria increase to varying degrees. In addition, particulate matter in indoor air is also an important health factor.

Take the most familiar example, referring to the air quality standard set by EPA, 35ug m3, so what about the indoor air quality?The concentration of particulate matter in an office building in Beijing was measured and found that it was polluted for more than half of the time in winter, so the indoor was not as beautiful as we imagined, and the pollution still existed. So, what about indoor air pollution, which mainly comes from?

Through the analysis of indoor air pollution, we can make a rough classification. Common indoor air pollution** includes the following: In fact, everyone understands in their hearts that closing the window is not completely closed (otherwise how to breathe), and at this time, outdoor air pollution can still penetrate into the room through the gaps in doors and windows, thus increasing indoor air pollution.

There are even studies that show that outdoor air pollution is critical, even decisive, for indoor air quality. The concentration of indoor air is basically proportional to the concentration of particulate matter in outdoor air. <>

Convenient transportationNowadays, many people choose to live in an important factor, but in fact, the more busy the traffic section, the more serious the indoor air pollution of the surrounding houses. Previous surveys of the imperial capital have shown that motor vehicle emissions have become a major source of air pollution. And this pollution naturally and inevitably permeates the room.

The impact of vehicle exhaust is often heavier, and the particles formed after the combustion of fossil fuels are often combined. Compared with the recent attention in China, many international studies have begun to take a step forward and pay more attention to the more nuanced. This ultra-fine particulate pollutant, due to its very small particle size, can easily pass through the gaps between doors and windows and enter the room.

In the 24 solar terms of the year, people will experience different natural imagination, in autumn and winter there is fog, with the beginning of heating in the north haze days will also come, compared to many people will be very puzzled, people often say that fog and haze is not a kind of itLet's take a look at the difference between fog and haze, and can you ventilate the room on a hazy day.

1. What is the difference between fog and haze?

1. The color is different.

When there is fog and haze, the first thing people see is the difference in color, among which the fog is biased towards white, which has a feeling of fairyland on earth. But the haze is the color of dust, and the orange-gray color is not very beautiful.

2. The thickness is different.

There is also a big difference in thickness, generally speaking, the thickness range of fog is tens of meters to 200 meters, but the thickness of the haze is relatively large, it can reach about 1 3 kilometers thick.

3. The humidity is different.

In fact, both fog and haze have a large proportion of water vapor, but the humidity is different. Generally, the relative humidity of fog is greater than 90%, and the relative humidity of haze is less than 80. The air is relatively dry on smog days, and the relative humidity of the air is usually below 80%.

4. The boundary characteristics are different.

Boundary features refer to the boundaries after going out of the fog and haze areas, when you get out of the fog range, you can see a clear environment, but there is no clear boundary between the haze and other places.

5. Visibility is different.

Visibility has a great impact on people's lives, where the visibility of fog is less than 1 km, and the horizontal visibility of haze is much greater than 10 km. When these two weather conditions occur, everyone tries not to drive, and the risk factor is relatively high.

2. Can you ventilate the room on a hazy day?

The breathing of people in smog days is not smooth, and the overall air environment is extremely poor. If you don't ventilate your home, the whole house will be dull. On the contrary, it will be more uncomfortable.

Therefore, it is necessary for everyone to master scientific and reasonable ventilation. You can't open the windows all day, so that the polluted dust outside will enter the home in the morning. The correct thing is to open the windows at noon, and try to open the windows as little as possible in the morning and evening when the haze is more serious.

Especially if you are close to the road, try not to open your windows during the day when there is a lot of traffic.

If you don't have an air purifier, I also don't understand why many people say that indoor is better than outdoor?

The real harm of smog to the human body is all kinds of polluting gases, not large gray layers.

Indoor air pollutants are different from the main components of outdoor air pollution, and the composition of indoor air pollutants is more harmful to the human body, indoor pollution is mainly used in indoor decoration and decoration materials, such as: man-made plates, various paints, coatings, adhesives and various furniture, etc., the main pollutants are formaldehyde, benzene, xylene and other organic substances and ammonia, carbon monoxide, carbon dioxide and other inorganic substances. Among them, formaldehyde, benzene and other substances are recognized carcinogens, while outdoor air pollutants (haze) are generally inhalable particulate matter, sulfur oxides (SO2, etc.), nitrogen oxides (NO2, etc.), compared with the two, regardless of the exposure time and degree of harm, indoor air pollution has a greater impact on human health.

It can be seen that for the prevention and attention of air pollution, we must start from our side, start from the family, pay attention to the environmental quality of the room (car) when buying a new car, and try to find a professional organization to do comprehensive testing and treatment, so as to create a truly green and healthy environment.

Engineers from the China Academy of Building Research have found that indoor concentrations are not necessarily lower than outdoor due to factors such as smoking and cooking. The measurement found that without opening the window, no one smoking or cooking, the indoor concentration is generally about three or four percent lower than the outdoor concentration, such as about 500 outdoors, and about 300-350 indoors. Another set of test data showed that the indoor concentration value of some households was higher than that of the outdoor one.

One of the households closed the door and windows for several days, and the outdoor concentration was measured with an instrument.

230 g m3, while indoors it reaches 474 g m3. Therefore, it cannot simply be said that indoor air is necessarily better than outdoor air on smog days.

2. Sources of indoor air pollution.

Indoor is affected by a variety of factors, and their previous monitoring of some public places has also found that the concentration inside is even higher than that outdoors, which is due to a variety of factors. Hou Li'an, an academician of the Chinese Academy of Engineering, said that indoor pollution sources are mainly outdoor pollution sources and indoor pollution sources.

When the smog is severe, if the windows are not opened correctly for ventilation, the indoor concentration will rise rapidly. At the same time, when the doors and windows are closed, it does not mean that the air flow is isolated, and the tiny particles can still run into the house. At the same time, people will also carry a variety of fine particles and microorganisms when they go out and return home.

In fact, everyday activities such as gas combustion, kitchen fumes, indoor smoking, air conditioning and heating, furniture decoration and other daily activities will bring to the interior. Due to the small amount of indoor space, the probability of being confined indoors is more obvious than that of outdoors, so it is not necessarily safe to stay at home.

If you feel that the indoor air is not good, you can try to use an air purifier, which is sold on the market and should have an effect. You can place a few pots of aloe vera, pothos, spider plant, etc., which not only absorb formaldehyde, but also play a beautifying role, and you can put a pot of cactus next to the computer to help absorb computer radiation. Also, try not to smoke at home, especially if you are around with small children.

If the outdoor air quality is good, open the windows for ventilation around 10 a.m. every morning. Of course, if there is smog, don't open the window, try not to go out, and wear a mask when you go out.

Hope it helps!

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