Haze, a term that once seemed unfamiliar, has now become a part of daily life. It appears unexpectedly and disappears just as suddenly, leaving people uncertain about when it will return or when it will vanish. As a result, flood prevention—especially in terms of air quality management—has become a critical issue. Scientific approaches, standardized testing, and advanced technologies are essential tools in this fight. These methods, often referred to as “combination punches,†play a vital role in combating the problem. The purpose of this article is to introduce these strategies, provide insights, and help readers make informed decisions in their efforts to protect themselves from air pollution.
The persistent poor air quality has made “fog and haze†and “PM2.5†household words. Products like “flood masks†and “PM2.5 air purifiers†have become popular, with many people rushing to buy them. But how effective are these so-called “fighting artifacts� Can a “hit-proof mask†or an air purifier truly protect against invisible PM2.5 particles?
**Masks: The Anti-Mite Effect Is Hard to Measure**
Currently, there are no national or industry standards for PM2.5 masks in China. This lack of regulation makes it difficult to assess the true effectiveness of these products. According to Lu Bing, director of the Jiangsu Special Security Products Quality Supervision and Inspection Center, the center recently conducted a risk monitoring of various masks available on the market. They tested 162 samples, including 70 from local stores in Nanjing and 92 from online retailers. These included disposable masks, industrial dust masks, and PM2.5 protective masks.
Since no specific standard exists for civil masks, the testing was based on existing national standards such as GB2626-2006 for industrial respirators and GB19083-2010 for medical masks. Tests focused on filtration efficiency and respiratory resistance, which are key indicators of mask performance. However, the results showed that many PM2.5 masks on the market had filtration efficiencies below 50%, indicating poor quality and inconsistency.
Experts like Su Hequn emphasize that without proper standards, the test results cannot be used as definitive proof of a mask’s effectiveness. Consumers should choose masks based on their needs rather than marketing claims.
**Air Purifiers: The Purification Effect Remains Unclear**
Similarly, air purifiers have become a common household appliance, with “PM2.5 purification†as their main selling point. However, the actual effectiveness of these devices is still unclear. When asked about detection methods, a salesperson at a Beijing supermarket admitted that PM2.5 particles are too small to be seen by the naked eye, making it hard to measure the purifying effect.
According to Li Long, deputy director of the Jiangsu Metrology Center, there is currently no unified standard for PM2.5 purification in air purifiers. While existing standards like GB/T18801-2008 cover general air purifier performance, they do not specifically address PM2.5 removal. A recent comparison experiment involving 20 brands showed significant variation in performance, with the best achieving up to 99.56% PM2.5 removal in 20 minutes, while the worst only reached 72.28%.
Experts warn that these results reflect differences in testing conditions rather than the true long-term effectiveness of the devices. Without clear standards, it remains challenging to accurately evaluate the quality of these products.
In conclusion, the lack of standardized testing and regulations for flood prevention products like masks and air purifiers raises concerns about their real-world effectiveness. Experts urge the development of clear guidelines and scientific testing methods to ensure consumers receive reliable protection against air pollution.
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