[knowledge] Not all high-tech masks can prevent smog

Not all milk is called Terunsu and not all masks can prevent smog

Recently, Lao Yang was shocked by a variety of face masks. You said that you didn't know what masks were useful. You will know after reading this article. But you have chosen a Hello Kitty with a rough workmanship and shaggy hair on the cottage. This aesthetic issue, Lao Yang, can't save you.

Closer to home, let's talk about which masks do not prevent smog:

1. Disposable masks purchased by hospitals and pharmacies. Whether it is white, green, blue or pink, even a rainbow cannot!

2. Your mother, your sister, your grandmother, your wife's hand-made wool masks. Warm masks can only keep warm, and it's still safe to use it.

3. Cotton cloth masks bought by Taobao. No matter whether it is a solid color of a lattice or a rivet with a pattern, it is not okay!

4. Activated carbon masks. First of all, this stuff can filter out odors, but not the ability to filter PM 2.5. In addition, if you buy a quality activated carbon mask that is off the kind of toner, it is equivalent to directly hit the soil, put it near the nose and suck it in, let alone smog, you simply suck Sandstorm.

So why aren't all these four products effectively resistant to haze? The so-called haze, PM 2.5, is actually a very small particle. All particles smaller than 2.5 microns in diameter in the air are called PM 2.5. For the above products, the hole is too large, and PM 2.5 slipped. So, it is not enough to fight maggots.

So what's the use of 3M HEPA N95?

There are two kinds of masks that can effectively fight paralysis, one is a particulate protective mask, that is, the white, 3M mask that people often say. The other type is gas masks. This is a relatively high-end one. We will say later.

In fact, masks that can effectively prevent smog on the market are previously prepared for special groups. Such as the construction site to play with soil, or coal mining in Shanxi mine. The environment in which they work is extremely dusty. Long-term survival in this air environment can lead to various respiratory diseases.

In the past two years, with the worsening of the air, the businessmen of Bengbu have used what was originally commercialized. Let's explain the next few related terms.

3M: is a company, the full name of Minnesota Mining and Manufacturing (Minnesota Mining and Manufacturing Corporation), was founded in 1902, headquartered in St. Paul, Minnesota, USA, is the world's leading multinational corporation. The so-called 3M masks are masks produced by their families.

HEPA: High Efficiency Particulate Air filter High efficiency particle air filter, which can filter particulates in the air, can be called HEPA. Only the term is mostly used in purifier filters.

The N95 is our next summary.

Even if you buy a 3M particulate respirator, you may not be able to prevent smog.

Some viewers saw that there was going to be a bustling street. You just said that the 3M masks are resistant to smog. Now you can't say it!

No, it is not, the audience next to the friends, please listen to me slowly, here we first talk about a knot not finished, what is the N95, this is not a Nokia mobile phone ah.

US NIOSH standard, the other particle mask made N, R, P three classifications, corresponding to non-oil particles; suitable for filtering oily and non-oily particulate matter, but the terms oily particles, the working time shall not exceed 8 hours; suitable for Filtration of oily and non-oily particulates, filtration of oily particulates takes longer.

The filtration efficiency is greater than or equal to 95%, what is called 95; filtration efficiency is greater than or equal to 99%, what is called 99; filtration efficiency is greater than or equal to 99.7%, not called what 997, and what is called 100.

In summary, the N95 mask represents a mask that can filter more than 95% of non-oil particles. Then hey, today's homework is explained separately under the meaning of R100 and P97, please leave a message directly to this article below.

Since we have mentioned American standards, we also say that Europe and China are the standards.

European EN is classified as ≥FFP1, FFP2, and FFP3 for particulate matter masks, corresponding to masks with a filtration efficiency of 80%, greater than or equal to 94%, and greater than or equal to 99%. The European standard says that the filtration efficiency includes both oily and non-oily particulate matter.

The Chinese GB 2626-2006 standard is divided into KN and KP categories for particulate matter masks, KN ​​category is suitable for filtering non-oily particulate matter, and KP category is suitable for filtering oily and non-oily particulate matter. Similar to the United States standards, what is called 90 for a filter efficiency greater than or equal to 90%, 95 for 95 percent or more, and 100 for 99.97% or more.

For a long time, what kind of oily non-oily things is it? Like microbes, coal dust, ah, acid mist, paint fog, what is called non-oily particles; oil smoke, asphalt smoke, coke oven smoke, automobile exhaust gas Both are called oily particles.

Therefore, the reason why buy 3M may not be able to prevent flooding, that is to say if you buy the N95 3M masks, then no exhaust for the car exhaust.

Buy the right mask, choose the wrong taste and still can't prevent it.

Even if you have spent a lot of money, bought a mask with no problem in function or quality, and you can't prevent smog from getting out. First, look at the common mistakes.

Because the mouth is covered with a layer of polypropylene material, so breathing certainly does not wear a smooth mask, so many people have appeared on the pattern of wear. Although this thing is called a mask, it doesn't mean that you only cover your mouth and it's time to do it! In addition to the cold, you can use your nose to breathe!

The second is common in the way many young girls wear. I know you don't have any health at all. The mask is just one of the concave items. However, for the protection of fog and fog can not get any effect, by the way Tucao about, you these non-mainstream aesthetic ah. Hey.

The third is a very common and often overlooked point, that is, a mask is not strict. Many people feel that masks are too low and breathing is not fast, so there will be problems such as not holding the metal strips on the nose flaps and increasing the rubber band of the lugs. However, in fact, it is too easy to wear, will only let the dirty air from the mask into the gap in the face, that is, you spared a half-day sin, and did not play a protective role.

Then how to detect whether the mask fits effectively? First, try to cover the mask with both hands for positive and negative pressure tests, that is, vigorously exhale and inhale to see if there is air entering from the edge of the mask. If there is a leak, please adjust it in time. Although it is troublesome, it should be adjusted every time the mask is worn.

Speaking so much about how to choose the right mask? Buy the most efficient filter?

The filter efficiency of the mask was described above, but in fact, the higher the level of filtration efficiency, the greater the resistance to breathing when worn, and the 90 or 95 standard is sufficient for daily anti-fog and haze use. If the budget is not bad, then P and KN are certainly preferred.

Secondly, masks can be divided into ear-hook styles and head wear styles according to lanyards. The advantage of the ear-hook type is that it is convenient to wear, but wearing it for a long time can feel very ears. Imagine if you also wear glasses, masks, Bluetooth headsets, then the ear may want to go with the dog.

If a mask is worn correctly, it is totally impenetrable. After finding the right angle, there will be a rope immediately on the head. However, such masks need to pass the rubber rope from the top of the head, which is inconvenient to wear, especially for eyeglass users like Lao Yang. And whether or not you wear it will affect the hairstyle! Therefore, Mr. Yang will always use a hat.

According to whether it is collapsible, masks can be divided into folding and cups. The advantage of folding is that it is portable and inexpensive, but when inhaling, the mask will squat on the face, and the filtering effective area will decrease and the breathing resistance will increase. The cup type won't solve the problem of the effective area. At the same time, the lips do not touch the mask. They are also relatively hygienic and are not easy to use. However, they are lost in portability.

Try to choose to wear a mask such as breathing valve, in addition to reducing the resistance to exhalation, more importantly, people will emit a lot of water vapor when breathing, if there is a breathing valve then you can relatively keep the mask dry. If you don't put it on your face and you have bad breath, it's just not alive.

Digression, do not want to smell the paint after the renovation, please wear P grade, KP level or European standard mask for protection. Want to go to formaldehyde and other harmful gases, particulate mask which does not work!

How often do you change masks?

Although these masks are not reusable for repeated use, they are not meant to be thrown away once and for all. Most masks produced by regular manufacturers mark the length of time the product is used.

Under normal circumstances, when the PM 2.5 value is more than 200 or even below, it is generally not a problem to wear a week or so, but if it is more than 300 consecutively, then it is still 3-4 days for a more OK.

If you have to go outdoors for a long time in the fog, change the masks according to the length of time.

The following groups of people are not recommended to wear masks! x3 Important things to say three times!

Patients with moderate to severe cardiopulmonary disease, hypertension, claustrophobia, anxiety, spontaneous pneumothorax, or other dyspnea should not wear dead masks.

For pregnant women, infants, and elderly people who do not have such a strong cardiopulmonary function, camping tries their best to avoid wearing masks.

If you feel dizziness, nausea or any other discomfort while wearing it, remove it immediately.

For the above three categories, please ask the doctor before deciding whether to wear it or not. However, as most doctors don't know much about masks, you can use the homework that Lao Yang left to detect them.