[Real-time] Anti-mite paraphernalia is limited to the efficacy of experts: as protective masks

Portable anti-caries artifacts have limited efficacy

Expert: as good as protective masks

The hazy days of the weekend once again allow people to aim at a variety of anti-nuisance items, including portable air purifiers that are small and portable. According to the merchant, it can disperse particles of contaminants within one meter of the wearer's periphery and “wrap” people in the clean air. The product is sold hot on the e-commerce platform, and parents buy for children. However, experts say that the machine's efficacy is "limited" and when it is outdoors, it may not be as good as a protective mask.

Merchant:

"Artifact" dispels close contamination

The Beijing Morning Post reporter saw that the anion air purifier was less than half the size of a mobile phone and was wearable. It was declared to be “the most effective personal charging air purifier in the world”. A brand publicity page shows that its air-cleaning effect is 9 times more powerful than similar products. It can remove 100% of dust and pollen within the scope of work. It can also remove 99% of viruses and 98% of PM2.5. Disperses contaminants within one meter of the wearer's head.

The reporters found that such portable wearable purifiers are mostly foreign brands, which are sold overseas by e-commerce vendors, and prices range from five to six hundred to several thousand yuan. There are also some domestic unknown manufacturers, the price is more than one or two hundred dollars.

Ms. Wang bought a device from the United States on the recommendation of her colleagues and brought it to the son of the elementary school. “The child has a large range of activities, the activity time is not fixed, the masks are inconvenient, and the purifier in the classroom is small. It's pitiful, so try it with this one. If it works, I'm going to buy a few more." But there are also consumers who “don't buy it” for this product. “The air is in circulation, and people are also moving. Will this thing handle harmful particles faster than air?”

expert:

It is better to wear a mask than outdoors.

The reporter interviewed Deng Gaofeng, secretary-general of the China Air Purification Industry and Director of the Low Carbon Architecture Research Center of China Academy of Building Research. He said that this kind of air purifier mainly uses negative ion technology, so that the particulate matter around the machine carries static electricity and attracts each other. Small particles adhere to each other and become large particles, and then sink. “Our tests in the experimental cabin showed that this technology can really reduce the PM2.5 content in the air, and the particulate matter does not disappear, but it adheres to the floor, furniture, and clothing. Therefore, people with an anion purifier at home can watch it. For a long time, furniture will be covered with 'black dust', and the same principle, people wear a purifier, 'black dust' will fall on people's skin, clothes, if not treated in time, with the human body movement, air Flowing, particles will still be inhaled into the respiratory tract, so its effectiveness is limited."

Director Deng also explained that effective experiments are carried out in the environment of an experimental cabin. Therefore, “people who carry air purifiers may be effective when used in a relatively closed environment. If they are outdoors, the effect of this thing may not be as good as Masks."

Mr. Ying, who has been engaged in the production and sale of air purifiers for many years, said that negative ion technology used in air purification will inevitably generate ozone. The elderly and children need to be especially cautious in using them, and should pay attention to whether the emission indicators are compliant and whether they are relevant. The department issued the "Disinfection Administrative License."