Wearing a mask is not scientific for four hours

Unpredictable and hazy weather has made people more aware of air quality issues. Wearing masks has become a common practice, especially when going outside. While the traditional mask is still appreciated for its simplicity and effectiveness, recent conflicting advice has left many confused.

Change Your Mask Every Four Hours

Many people wear masks during smoggy days. However, it's important to remember that masks should be replaced every four hours. After this time, they accumulate harmful particles, which can be inhaled if not changed. Gauze masks can be washed and reused, but medical and N95 masks are designed for single use only. Reusing them may reduce their protective value.

Misinterpretation: Masks Shouldn’t Be Worn Longer Than 30 Minutes

A recent social media post claimed that Germany had a rule stating masks shouldn't be worn for more than 30 minutes, sparking debate. Experts from 3M China clarified that this was likely a misreading. The German regulation (BGR190) does set time limits for respirators used in workplaces, but only in high-risk environments where workers are exposed to heavy particulate matter. In such cases, masks can become clogged quickly, increasing breathing resistance. This rule applies specifically to occupational safety, not to the general public.

Recently, a photo of a mask filter before and after use went viral on Weibo, causing concern. The condition of the filter can indicate how polluted the air is. If the filter turns dark quickly, it’s a sign that the air quality is poor.

Opinions vary widely on mask usage. Choosing the right type of mask depends on the situation and the level of protection needed. Different jobs and environments require different solutions.

In general, selecting a mask involves considering three key factors: protective performance, fit, and comfort. PM2.5 and other fine particles are hard to filter with regular masks. If the mask doesn't seal properly against the face, it won't offer effective protection. Additionally, comfort and breathability are crucial, as wearing a mask for long periods can cause discomfort. These factors influence how well the public accepts and uses masks in daily life.

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