Since 2014, the haze has continued to increase. Previously, according to the Ministry of Environmental Protection, most of the provinces in the central and eastern regions of China experienced severe haze, and 20 cities were heavily polluted, affecting an area of ​​about 1.43 million square kilometers and consuming 15% of China. And precisely because of this, the air purifier in the market has become the focus of everyone's attention.
According to a report released by the China Electronics and Information Industry Development Research Institute recently, air purifiers have become the most popular home appliances due to smog weather. Last year, the national sales volume was close to 2.4 million units, an increase of 90.5% year-on-year; retail The amount reached 5.6 billion yuan, a year-on-year increase of 105.9%. And we also see from the major stores, the main "except the 霾" brand, claiming that the "99% removal rate" of the air purifier light brand is no less than ten, the type models are numerous, and are placed in the entire store The most conspicuous position in the market shows that the entire market is extremely hot.
However, recently media reports said that for the elimination of indoor PM2.5 particles, the air purifier has only an auxiliary effect, the effect is far from the nominal "99% removal rate", and because there is no scientific unified detection method, some products Not even tested. Seeing such news is definitely a blow for those who want to buy air purifier products. However, everyone should not worry too much, industry insiders and experts also said that as long as the qualified air purifier products are used reasonably, there will be some impact on the indoor air purification effect. Therefore, below, we have summarized a few misunderstandings about the use of air purifiers for your reference.
- Conceptual misunderstanding
Misunderstanding 1: no air purifier, window ventilation can improve indoor air quality
If the outdoor environment is good, ventilation can increase the oxygen content of the air and reduce the concentration of toxic gases. But obviously, like the smoggy weather all the time, the outdoor air is probably worse than the indoors. Therefore, for the present, it is crucial to master the principle that “the sky is good, the window is open, and the sky is not good to close the windowâ€.
Myth 2: Indoors do not smoke, no smell, even if the air is fresh
Obviously not. The standard of air freshness is not just that there is no odor. In addition to PM2.5, which is already well known, the harmful substances in the air include dust, formaldehyde, benzene, ammonia, radioactive cesium and the like. These harmful substances can cause headaches, upset, fatigue, high blood pressure, mental dysfunction, loss of attention, decreased work ability, insomnia, etc., and cause asthma or urticaria, and even damage the alveoli and carcinogenesis.
Misunderstanding 3: There is fog outside, and there is no PM2.5 in the window.
PM2.5 refers to particulate matter with a diameter less than or equal to 2.5 microns in the atmosphere. It is also known as particulate matter that can be incorporated into the lungs. The main components are elemental carbon, organic carbon compounds, sulfates, nitrates, and ammonium salts. Other common ingredients include sodium, magnesium, calcium, aluminum, iron and other rich metal elements in the earth's crust, as well as lead, zinc, arsenic, cadmium, copper, etc., which are harmful substances with high carcinogenic rate. The PM2.5 in the air mainly comes from the residue emitted by combustion during daily power generation, industrial production, and automobile exhaust emissions.
However, this is not to say that there is no PM2.5 indoors without opening the window. In fact, PM2.5 is essentially tiny particles, and second-hand smoke is also the main source of indoor PM 2.5. According to previous expert tests, smoking from a cigarette 3 to 6 meters from the smoke can cause the concentration of PM 2.5 in the air to reach 300 micrograms / cubic meter.
Myth 4: The air purifier that can remove PM2.5 is a good product.
Just like our misunderstanding above, there are many other harmful things in the air besides PM2.5, whether we are indoors or outdoors. For example, if your home has just been renovated, there may be harmful substances such as formaldehyde in the air, and the fumes, inferior perfumes, radioactive gases released from the stone, etc., which are produced during cooking, are also very common air pollutants. Obviously, the standard of air purifiers is not just to see if PM2.5 can be removed.
- use misunderstanding
Misunderstanding 1: The air purifier must be used
For indoor pollution control, there are many factors influencing the source of pollution, and it is not only based on air purifiers. For example, in the recent smog weather in Beijing, Beijing should first close the window, open the door as little as possible, and create a relatively closed space for the indoor battalion; secondly, adjust the indoor temperature and humidity conditions, and then use humidifiers, watering, etc. in the winter. The relative humidity is increased and the indoor dust is not allowed. It is only more effective to use an air purifier under such circumstances. Otherwise, the source of pollution will continue to come through the window, even if the air purifier is always on, the effect will be greatly reduced.
It has been reported that the air purifiers sold in the market are really few in addition to effective ones, and there are even many products that have no effect at all. Here we do not consider products that are suspected of false propaganda, assuming that all products can achieve a certain removal effect. But as mentioned above, air pollution is caused by many factors, and the air purifier is only a means of assisting.
Misunderstanding 2: Usually does not open, only foggy weather will open
In fact, the vast majority of consumers have such misunderstandings and excuses. After all, the popularity of air purifiers is caused by persistent haze weather. However, we also mentioned above that for the cleaning of air, not only the smog is pollution, dust, odor, bacteria, chemical gases, etc. all have adverse effects on the human body, and the role of the air purifier is positive. It is the removal of these harmful pollutants. Especially for the newly renovated homes, the vulnerable people in the home who are sensitive to the air, the young people, and other vulnerable people, the air purifier can still play a role.
Of course, if the weather is fine outside, we recommend that everyone's indoors be ventilated and maintain a certain humidity so that fresh air can flow indoors. Sometimes this effect is more effective than opening an air purifier all year round.
Myth 3: Air purifiers bought once and for all
To be honest, because of the continuous smog weather, many people have become interested in products such as air purifiers, but whether the air purifier can really remove harmful substances, can not see and touch, no one can really say clearly. However, one thing is certain. The air purifier must not be bought once and for all. Whether it is physical filtration or electrostatic dust purification technology, it is necessary to regularly clean and replace the filter to fully utilize the air purifier. effect.
Myth 4: Buying an air purifier at home will work in the whole room.
Due to the lack of understanding of the air purifier, many people think that as long as they buy an air purifier at home, they are fixed in one place, and long-term use will purify all the rooms in the house. However, some experts in the industry said that although the air purifier has certain effects on the removal of particulate matter from the technical principle, its limitation is that it is only effective in a specific applicable area and time. However, there is currently no standard for defining the purification efficiency of a product per unit time and applicable area. Therefore, the best use of the air purifier is to put one in each independent space, or to measure the flexible rotation in different positions.
Myth 5: The air purifier consumes a lot of electricity and can be used for one or two hours a day.
The power consumption of air purifiers is generally not high, and the power consumption of mainstream products generally does not exceed 70W, which is still very power-saving. It is recommended to turn it on at any time when the air quality is poor.
- Purchase misunderstanding
Misunderstanding 1: The more expensive the air purifier, the better the effect (the more the air purifier filter layer, the better the purification effect)
In principle, air purifier products are basically using filter technology, which is simply a combination of fan + net filter. The micro-fan in the machine stirs the indoor air, and under the action of the fan, the particulate matter in the air is adsorbed on the filter net, so that the particles in the air are decremented to achieve the purpose of cleaning the indoor air. It can be seen that the key to the air purifier is the installation of the filter. For most products, the price difference depends on the number of layers and the quality of the filter.
However, the "the more the number of filter layers, the better the purification effect" and "the more expensive the price, the better the purification effect", these two statements are not accurate. First of all, although the number of layers of the filter determines the price and determines the effect, the material of the filter will directly affect the purification effect, especially the HEPA filter we often say, its current price in the market is from a few hundred to the top. There are thousands of different filtering effects. Secondly, in addition to the filter, some air purifiers will have additional functions such as liquid crystal display and humidifier. These are important factors in determining the price of the product. Even there have been reports that an empty net product with a price of 7,000 yuan. The cost is only about 2,000 yuan, so it is inaccurate to use the price as a benchmark.
Misunderstanding 2: When purchasing, look for the "purification rate of 99.9%"
The biggest misunderstanding of consumers about air purifiers may be "99.9%" which is now boasted by major manufacturers. If you buy an air purifier and see the promotion of "purification rate of 99.9%", you don't need to trust more. First of all, due to the lack of industry standards, there is no complete unified algorithm for the so-called air purification rate. Secondly, the purification rate of the product will be affected by various factors such as air volume, working time and room area, which will result in a different purification experience of 99.9%.
Of course, it is not that there is no basis for purchasing an air purifier. There are many indicators that determine the performance of an air purifier, such as CADR values, 1 hour purification rate, HEPA filters and other filter quality, cost of replacing filters, noise, and more. In particular, the CADR value (clean air output rate) is the ratio of the air purifier output clean air obtained by the American Association of Home Appliance Manufacturers (AHAM) according to certain test standards. Simply speaking, the higher the CADR value, the air. The purification rate of the purifier is higher, but some brands are not involved in the AHAM test.
Misunderstanding 3: In addition to performance indicators, the purchase of air purifiers depends on the "applicable area"
An important indicator for many consumers to purchase air purifiers is the "applicable area" of the product. In fact, the so-called applicable area is not reliable, if it is unreasonable to decide to purchase. Because “applicable area†is not a value that can be determined by simple calculation, or even a constant value, it will change with the use environment and conditions, “such as the air quality and climatic conditions of the city, user housing. The height of the floor and the decoration materials, etc.". This is also the reason why the definition and detection method of the cooling capacity are clearly defined in the standards of the mature air-conditioning products, but the "applicable area" has never been included in the product standard.
As we mentioned in the above answer, the best way to use the air purifier is to put one in each independent space, or measure the flexible rotation in different positions. Zhao Yang
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