Wearing a mask is not scientific for four hours

As frequent and hazy weather becomes a common concern, people are increasingly turning to masks as a way to protect themselves. The traditional practice of wearing a mask is valued for its simplicity and effectiveness. However, two conflicting pieces of advice have recently caused confusion among the public.

Change your mask every four hours

Many people wear masks when going out in misty or polluted conditions. It's important to remember that masks should be replaced every four hours. After this time, they accumulate harmful particles, which can be re-inhaled if not changed. Gauze masks can be washed and reused, but medical and N95 masks are designed for single use only.

Misinterpretation: Masks shouldn’t be worn for more than 30 minutes

A recent social media post claiming that Germany limits mask usage to 30 minutes sparked widespread debate. Experts from 3M China clarified that this was likely a misunderstanding. While there is a German regulation (BGR190) regarding respirator use in workplaces, it applies specifically to occupational settings where workers are exposed to high levels of airborne contaminants. This rule is part of an insurance requirement and is not intended for general public use.

Recently, a photo of a used mask circulating online made many people nervous. The condition of the filter inside the mask can give a clear indication of air quality. A dark or clogged filter means poor air quality, while a clean one suggests better conditions.

Opinions on mask usage vary widely depending on individual needs and environments. Choosing the right mask depends on several factors. Generally, the selection should focus on three key aspects: protection level, fit, and comfort. PM2.5 and other tiny particles in the air are hard to block with non-professional masks. If the mask doesn't fit properly, it won't provide adequate protection. Additionally, comfort and breathability are essential for long-term use, as uncomfortable masks may be removed too soon or avoided altogether.

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