Wearing a mask is not scientific for four hours

Frequent and hazy weather has caused people to cope with haze. The traditional wearing masks have been respected for their simplicity and practicality. However, the two kinds of sounds that emerged at one time made everyone overwhelmed.

Wear masks every four hours

Mist, many people wear masks when they go out. It should be noted that when wearing a mask, it is best to change it once every 4 hours, because after wearing 4 hours, the mask has been covered with harmful particles, and if it is not replaced, it will be inhaled by the body. Gauze masks can be worn after cleaning. Medical masks and N95 masks are disposable and cannot be reused.

Masks must not be worn for more than half an hour is misread

In recent days, most areas of China have been affected by haze and afflictions. Masks have become a must-have item. Recently, a microblogging statement “German stipulated that masks may not be worn for more than half an hour” triggered heated discussions. Experts from the technical department of 3M China Ltd. stated that this may be misreading.

The German regulation (regulation number BGR190) does require time limits for the use of respirators in the workplace, but this provision is purely based on the requirements of the insurance (safeguards) clause and applies only to employers requiring employees to wear their breath in the workplace. Case. The establishment of this insurance clause is based on the expectation that there is a high-intensity operation in the employee's work. Simply speaking, only in the extremely harsh working environment, the filtered particles will quickly clog the mask filter, resulting in increased respiratory resistance.

Recently, the reporter saw the filter cotton before and after the mask that was seen in the Weibo, and scared a cold sweat. Real air quality is good or bad, just look at the filter device.


There are many different opinions. How to select the most suitable method for different types of work in different ways is not the same.

In general, the choice of masks should be considered from three aspects: protective performance, wearing tightness and comfort. PM2.5 and other suspended particles in the air are extremely small, and non-professional protective masks cannot effectively filter these small particles. At the same time, if the mask can not effectively seal with the face, it will lead to protection failure. In order to alleviate the discomfort caused by wearing masks for a long period of time, the comfort and breathability of the masks are also very important, which is related to the public acceptance of the masks and the wearing time.

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