Experts have proved that activated carbon masks do not intercept PM2.5

In today’s fast-paced digital world, information spreads rapidly with just a click. While it’s easy to access, it also brings the risk of misinformation. From the "salt for salt" controversy to rumors about Beijing’s water security, fake or misleading content has flooded the internet, sometimes confusing the public and even threatening social stability. Since October, Beijing has seen an increase in smoggy days, making masks a popular item again. Many masks on the market claim to block PM2.5, but what kind of mask is truly effective against fine particulate matter? To find out, a reporter recently invited experts to test the filtration performance of seven different types of masks. **Experiment: The N95 Mask Proves Most Effective** The reporter purchased N95 masks, non-woven masks, PM2.5 masks, activated carbon masks, regular three-layer cotton masks, 18-layer medical gauze masks, and surgical masks from online stores, markets, pharmacies, and hospitals. These were then tested by chemistry professionals in a lab equipped with a particle analyzer that meets national standards. The experiment used cigarette smoke—smaller particles similar to real PM2.5—as a contaminant, rather than toner, which is larger (PM10). A student from Beijing Normal University’s affiliated middle school helped set up the equipment, ensuring accurate results. During the test, each mask was placed in a chamber where smoke was drawn through it. A laser dust meter measured the number of particles larger than 1 micrometer. The results showed that non-woven and 18-layer gauze masks had low filtration efficiency, while N95 and surgical masks performed significantly better. The N95 mask, in particular, kept PM2.5 levels at just 13 μg/m³, compared to over 600 μg/m³ without a mask. Activated carbon and cotton masks were less effective, allowing high concentrations of particles to pass through. **Expert Advice: Choose Wisely** Experts explained that N95 masks offer the best protection, while ordinary cotton masks are the least effective. Activated carbon masks, though popular, may release small particles if the filter layer is damaged. Surgical masks also have good filtration but can be uncomfortable due to poor breathability. Professor from Fudan University emphasized that proper fit is essential. The mask must seal tightly around the face, and people with respiratory issues should choose masks carefully based on their needs. **Design Matters: Porcupine Arch Improves Fit** Masks with a 3D design, like the “porcupine arch,” provide a better fit and reduce gaps. Flat masks often leave spaces, reducing effectiveness. Some companies now use advanced materials like Reynolds fibers and microfiltration technology to improve protection. **Real-Life Observations: Few Know How to Choose** During an interview with pedestrians, only 25% of those wearing masks knew how to choose the right one. Many relied on sales recommendations without understanding the science behind filtration. Most wore disposable or patterned masks, unaware of their actual protective value. In conclusion, while masks can help protect against PM2.5, it's important to select the right type, ensure a proper fit, and limit outdoor exposure during high pollution days.

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