Can wearing a mask protect against smog?
Common anti-smog masks on the market range in price from three or four yuan to thirty or forty yuan, made from materials including pure cotton, linen, and activated carbon. Some claim up to 99% filtration efficiency against PM2.5.
In fact, experimental equipment can measure a mask's filtration effectiveness against PM2.5 particles.The principle involves gas entering a measurement chamber through an inlet under fan pressure, where a detector measures PM2.5 levels.
Test results:
1. 3M masks: As an industry leader, 3M delivered consistently strong performance. Its N95-rated products achieved 98% efficiency. This reflects the filter material's standalone performance.
2. Micro-silver masks:This result surprised us—a valve-equipped mask achieved 99% filtration efficiency. This highlights two factors: the filter material's inherent effectiveness and the valve's excellent airtightness during inhalation.
3. Masks with layered filter cores: Since air passes not only through the core but also through surrounding fabric, filtration is poor, achieving only 47% efficiency.
4. Medical single-layer masks: Their filtration performance is average, with 43% efficiency.
5. Cotton masks: They provide almost no PM2.5 filtration.
(We'd like to test their filter cores for comparison.)(We'll test its filter core for comparison when possible)
4. Medical one-way masks delivered average filtration at 43%.
5. Cotton masks showed almost no PM2.5 filtration, achieving only 4%.
In summary, masks offer some protection against smog, but their effectiveness falls short of market hype.
What's the most effective way to protect against smog?
1. Minimizing outdoor exposure remains the most effective self-protection measure. If going out is unavoidable, avoid cycling, rush hour traffic, and heavily congested roads to minimize inhalation of chemical pollutants. Opt for public transportation over private vehicles whenever possible.
2. Cigarettes, cigars, and pipes produce numerous fine particulate matter (PM2.5) when incompletely burned. Tobacco smoke contains over 7,000 compounds, including 69 carcinogens and 172 harmful substances, severely endangering both smokers and those exposed to secondhand smoke. During hazy weather, this poses an even greater health risk.Therefore, smokers should minimize smoking both outdoors and indoors in the coming days.
3. Avoid opening windows during hazy weather. If ventilation is necessary, do so outside peak haze periods in the early morning or evening. Open windows slightly for ventilation, limiting each session to 30 minutes to an hour.
4. Residents using air conditioning for heating should ensure adequate ventilation to maintain sufficient oxygen levels indoors. Consider placing green plants like pothos, Chinese evergreen, or snake plants on balconies, patios, or indoors. These large-leafed, green-crowned plants possess relatively strong adsorption capabilities.
5. Purchase certified N95 masks that fit your face properly. After removal, allow the mask to dry completely before folding it to prevent moisture from promoting bacterial growth.Avoid prolonged wear. Elderly individuals and those with cardiovascular conditions should refrain from wearing masks to prevent dizziness caused by breathing difficulties.
6. Upon returning indoors after going out, promptly wash your face, rinse your mouth, and clean your nasal passages to remove any residual pollutants and prevent PM2.5 harm.
7. Use lukewarm water when washing your face to effectively remove particles. For nasal cleansing, use a clean cotton swab moistened with water for repeated cleaning, or gently inhale water through the nose and quickly blow it out—avoid coughing. Beyond facial cleansing, wash all exposed body parts.
8. Reduce intake of irritating foods while increasing consumption of fresh vegetables and fruits. This replenishes vitamins and minerals, moistens the lungs to combat dryness, alleviates coughing and phlegm, and strengthens the spleen and kidneys.
9. Homemade throat-soothing tea is an excellent choice for relieving dry throat and coughing, while also reducing air pollution's impact on the lungs.