Are air purifiers really effective in reducing indoor air pollution?
(Summary description)At present, the purification technology of particulates in the air is relatively mature. A professional testing agency tests and evaluates different types of air purification products, and has conducted field experiments in offices and households. The results show that in offices and households using air purifiers In houses, the mass concentration of PM2.5 can be reduced.
At present, the purification technology of particulates in the air is relatively mature. A professional testing agency tests and evaluates different types of air purification products, and has conducted field experiments in offices and households. The results show that in offices and households using air purifiers In houses, the mass concentration of PM2.5 can be reduced.
The purification efficiency of the house area and the purifier are different, and the required purification time is different. Some purifiers with good performance require shorter purification time. For example, 1 hour can reduce the indoor PM2.5 concentration by more than two-thirds. Close the doors and windows of the room in polluted weather, air purifiers have a certain effect on reducing indoor PM2.5 concentration.
Understand the purification principle of air purifiers
There are many types of air purifiers, such as filtration, electrostatic adsorption, chemical reactions, and multiple types of combined purification. Filtering refers to the use of a fan to draw air into the machine, and the air is filtered through a built-in filter, which can prevent particulates, toxic and harmful gases And some bacteria, etc. play a certain filtering role.
Chemical reaction refers to the effective purification of indoor air through various chemical reaction technologies, such as silver ion technology, negative ion technology, and photocatalyst technology. Multiple purification refers to the combination of filtration technology with various chemical reactions and other technologies. Most existing air purifiers use multiple purification technologies.
New requirements for the new national standard for air purifiers
The newly revised national standard for air purifiers “Air Purifier” (GB / T 18801-2015) has been officially implemented. The new national standard specifies several core indicators that affect the purification effect of air purifiers, namely CADR value (clean air volume) CCM value (cumulative purification amount), energy efficiency level, and noise standard. The higher the CADR value, the faster the purification efficiency, and the higher the CCM value, the more pollutants the air cleaner filter purifies during its lifetime.
These two indicators reflect the purification ability and the sustainability of the air purifier, and are the key to judging the quality of an air purifier.
In addition, specific requirements are also given for the applicable area, the requirements for the release of harmful substances, the evaluation methods for small air purifiers, and the evaluation methods for duct-type purification devices.
How should consumers choose the right purification products?
Any air purification device is targeted at the purification of pollutants. Air purification technology with different principles has certain advantages, but also has limitations.
When selecting an air purification device, first determine the purification purpose, that is, which pollutants to purify. If the main pollutant PM2.5 is the haze, choose a purifier that is effective for PM2.5.
Secondly, select regular manufacturers and identify products that are valid according to the standards of air purifiers (such as reference CADR value, CCM value, etc.). If CARD value is 300, the applicable room area is 15-30㎡.
In addition, the actual purification effect of the air purifier is also related to the room area, energy efficiency, running time, etc. At the same time, the noise generated by the purifier must be considered, and it will not affect the daily rest.
Be careful of secondary pollution when using air purifiers
If you open the air purifier in a closed room for a long time, you need to pay attention to the "secondary pollution".
First of all, the air purifier's purification material has a risk of generating ozone, and ozone can cause strong irritation and damage to the respiratory system. The elderly and children are more sensitive to ozone. Therefore, it is necessary to pay attention to the increase in ozone concentration that may cause human body. Adverse reactions;
In addition, if the air purifier is turned on in a closed room for a long time, when there are many people in the room, it will cause lack of oxygen in the room, reduce the indoor humidity, and generate noise. These will cause people to feel uncomfortable. Therefore, it is necessary to Feel, adjust the use time of the air purifier, and open the window for ventilation in time if necessary. It has a service life. After use for a period of time, it will adhere to particles or other microorganisms, and the purification material is saturated. Timely replacement of purification materials;
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