"Anti-mite products" choose to pay attention

With the haze index "a new record," air purifiers, protective masks and other "hit-proof products" face a large area out of stock. The masks of the market are not all able to prevent PM2.5. The selection of "prevention products" is very particular.

Compared to more expensive air purifiers, protective masks are also popular with consumers in smog days. The person in charge of the Suning Tesco Market Center stated that since November, the sales volume of Suning's masks has surged, and masks in Shanghai, Beijing and other places are in short supply, and they have to be replenished quickly. "A 3M head-mounted anti-particulate mask sold nearly 20,000 in one week in East China."

What kind of mask can effectively prevent PM2.5?

Zhang Hao, deputy director of the Department of Respiratory Medicine at the Children's Medical Center of Shanghai Jiaotong University, said that the so-called professional anti-PM2.5 masks are currently inconclusive for their ability to block fine particles. But in her view, “whether or not a mask can block all particles in the air, it’s better to wear it than to wear it outside in heavily contaminated air conditions.” At the same time, even if masks don’t always filter out ash, Fine particles, but at least can maintain mouth and nose moisture, reducing respiratory moisture loss.

Fu Haidong, a professor at the Fudan University School of Public Health who has long been concerned about the PM2.5 problem, said that the masks that are considered to be the best at preventing PM2.5 are mainly N95 and KN90. However, even if the mask is selected correctly, it must be worn properly. Attached to the face, the mouth and nose breathe completely through the mask filter. Masks with good filtering effect are often poor in breathability, which can lead to increased respiratory resistance and difficulty in breathing. Therefore, people suffering from respiratory diseases should be carefully selected. (Oriental Morning Post (blog, Weibo))

Is an air purifier useful?

In recent days, many parts of our country have suffered from persistent haze. The haze has given rise to blocking the people, but it has brought business opportunities to air purifiers. However, in the end, the public has no idea. A survey by the reporter found that due to the lack of relevant standards, it is difficult for consumers to make accurate judgments on the ability of the purifier to purify.

The reporter learned from Suning that starting in late mid-November, the sales of air purifiers entered a peak period, which is a 680% increase compared with the same period of last year. “The price of air purifiers between 3,000 yuan and 4,000 yuan is best to sell, a 3,400 yuan. The air purifier sold more than 3,000 units in one day," said the person in charge of the Suning Tesco Market Center.

At present, air purifiers sold on the market range from 1,000 yuan to 2,000 yuan for the “pro-people’s money” and also nearly 10,000 yuan for “local tyrants”. Various manufacturers also took the opportunity to declare in the advertisement "PM2.5 removal rate of 99.99%", "99% formaldehyde purification rate" and so on. So, do these products really achieve the manufacturer's declared effect?

The relevant person in charge of the Air Purifier (China) Industry Alliance said to reporters yesterday, “There are two main mandatory standards for air purifiers in our country, namely the electrical safety indicators and the antibacterial rate of antibacterial materials. Its type and parameters , test methods, inspection rules, etc. are only recommended standards, not mandatory standards, and cannot be used as a law enforcement standard in market supervision.” In addition, the Shanghai Consumer Protection Committee conducted an investigation of the air purifier market this year, which was tested In the Taiwan samples, PM2.5 purification efficiency, the sample purification efficiency is generally higher, are more than 78%, there are two sets of sample purification efficiency greater than 99%.

The deputy secretary-general of the alliance, Chen Yun, will remind consumers that consumers should purchase purifiers according to their actual needs, not the more functions, the better; when using, try to keep the doors and windows closed and run at the maximum air volume for at least 30 minutes before adjusting. To other stalls.

CCTV reporters saw a number of home appliance stores in Beijing and Shanghai. Almost all air purifier manufacturers claimed that their product purification effect was very good. The removal rate of harmful substances such as PM2.5 and formaldehyde was as high as 98% or even 99%.

However, this expert stated that the current national standards stipulate safety, antibacterial, and other aspects of air purifiers, but there is no clear requirement for PM2.5 and formaldehyde removal rates, so companies can set their own area, operating time, and initial concentration. Get the necessary data, alone to see this value can not determine the size of the purification capacity, that is, also claims that PM2.5 removal rate of 99%, and some purifiers only need an hour to reach, and some purifiers may need 10 hours.

The reporter learned that while many purifier products advertise the removal rate, they ignore the “applicable area” as an important measure of the purifying capability of the purifier. Currently, there is only one item in the local purifier local standard in Shanghai. "Area" refers to the maximum indoor area suitable for use in air purifiers, mainly for PM2.5 particulate matter. Yesterday, the Shanghai Bureau of Quality Supervision announced the results of risk monitoring on the applicable areas of the mainstream purifiers in 20 markets. There are 9 types of purifiers with a larger area than the actual measured values.

In addition, there are still 7 products that do not label the applicable area at all. According to the test results, the phenomenon of elevation of air purifiers and non-applicable areas is very serious. The application of the area of ​​elevation may reduce costs and increase sales, but for The legitimate rights and interests of consumers are an infringement because the applicable area is only local standards. Even if the company does not label or mark it arbitrarily, it is difficult for the relevant departments to carry out effective supervision. The experts call for the early introduction of indicators concerning the purification capacity of the applicable area into the country. standard.

In addition, the reporter found that there are some small air purifiers that are only sold on the Internet. They are cheap and some of them sell for more than 2,000 units a month. In fact, these so-called air purifiers are small ozone machines. The six purifiers purchased did not meet the requirements of the national standard.

Although ozone can be sterilized. However, once the ozone concentration is too high, it is easy to damage the human respiratory tract. Consumers are advised not to purchase this small-scale ozone generator.