Category Archives: Prevention

Diabetes: An Avoidable Lifestyle Choice

I’ve been a family doctor for fifteen years, and one of the more dramatic changes I’ve noticed is a big spike in the incidence of prediabetes and diabetes, in all age groups. I had worked in China for ten years until last summer, and all us family doctors at my Beijing clinic weren’t surprised at all with the 2013 paper published in JAMA confirming the frightening reality in China: more than half of all adults in China now are prediabetic. Even worse, 11.2% have diabetes, giving China the dubious distinction of having the highest prevalence of diabetes in the world — higher than in the USA, an extraordinary statement given the far higher rate of obesity in the USA. As tomorrow, March 22  is American Diabetes Alert Day, I felt a timely urgency to share my advice on how to avoid this disease – or at least to slow it down.

It helps me to think of diabetes as a modern lifestyle disease, mostly caused by all developing countries’ gains in weight, less physical activity, and changes in diet. Diabetes now is a global pandemic. Tens of millions of people have diabetes, and many people are undiagnosed because they’ve never been tested. There are two types of diabetes, and type 2 diabetes accounts for 90 to 95 percent of diagnosed diabetes in adults.

Prediabetes concerns us doctors because it means you are at extremely high risk of developing diabetes in the next few years. Studies show that a prediabetic person has a 25% risk of developing diabetes within three years, and a majority within ten years. The greatest risk factor by far is overweight and obesity. Having a BMI under 23 is ideal, and a BMI of 25 increases your lifetime risk of diabetes by 600%. A BMI of 30 increases your risk by 4,000% — that’s 40 times the risk! That’s an extraordinary number which should worry us all, since in the USA over two thirds of adults are overweight and over a third are obese.

But here’s the good news: the crucially important message for everyone is that you have great control over whether or not you develop full diabetes. You should think of prediabetes as an early warning sign by your body, a major wake up call that whatever you’ve been doing to your body isn’t too healthy. Most people with prediabetes fit one or more of these three major risk factors: body mass index (BMI) over 25; lack of enough exercise; and unhealthy food choices as well as portion sizes.

So let’s say that you’re one of the many people who has prediabetes: what can you do right now to help? If you follow the three lifestyle steps below, you can lower your risk more than half! One of the most important public health research studies ever, the Diabetes Prevention Program, proved that lifestyle changes worked better than pills in reducing progression to diabtes. Lifestyle changes lowered a prediabetic person’s risk by 58% over three years — much better than the 31% improvement with a daily pill (metformin).

So what are these magic steps? Without further ado:

  1. Lose weight. Weight gain and obesity are the top causes of type 2 diabetes, and losing weight is now proven to be the most effective prevention. In the DPP study, the goal was to lose at least 7% of your body weight. Your goal should be to lose 5-10% of your body weight.
  2. Exercise. Exercise may not directly cause much weight loss, but exercising muscles absorb sugars much more effectively. This is why exercising is crucial to help control sugars, both in a prediabetic as well as in diabetics. How much exercise is enough? We usually recommend 150 minutes a week of moderate exercise, but any amount is better than nothing. Also, as I mentioned in an earlier column, shorter, more intense workouts can help as much as moderate exercise.
  3. Proper diet. Healthy food choices also are crucial to control your sugars. One of the most common misperceptions about diabetes and prediabetes is that it’s “a sugar problem” and you must cut down on sweets and desserts. The bigger culprit are total starches — pastas, breads, rice and potatoes. In all these cases, processed versions are never as healthy as the originals.

Here are a few quick tips on nutrition:

  • Brown is always better than white: Processed white bread and flour have lost all the nutritious fiber which helps regulate your bowels as well as your sugar spikes after a meal. If you love your carbs, at least try to switch to whole wheat pastas, breads and rice.
  • Portion control: Total calories are also important, as most likely you are taking in a bit more than you realize. These extra calories will get deposited as fat, which leads to more risk of diabetes.
  • Cut back on sodas, beer and juices: All of these are empty calories, full of processed sugars which stress out your liver and pancreas. These unhealthy carbs, especially in sodas, are a major cause of obesity and diabetes in both children and adults.

Type 2 diabetes is partly genetic, so no matter how healthy you are, it still may be inevitable. But these above steps are always good advice for all of us. Another great thing about these healthy life changes is that they also dramatically reduce your risk of heart disease, many cancers, and early deaths from all causes.

Don’t get discouraged — you have control over the next steps!


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Don’t Skip Breakfast! Here’s Why.

Did you know that the U.S. Center for Disease Control predicts that one third of all Americans will have diabetes by the year 2050? This scary statistic is not just an American phenomenon; many Western countries’ modernized diets have led to a diabetes epidemic. The main culprits are what you would expect: obesity and an unhealthy diet. These lifestyle patterns are set as children, and are very difficult to change later on.

So what steps can we take to prevent this? As we recognize National School Breakfast Week, one crucial step is to always have breakfast. Most of the 20-30% of children and teens skipping breakfast may think it’s no big deal, but the long-term consequences of skipping breakfast can be serious enough to warrant a big family discussion. We all know instinctively that eating breakfast is important, and research can help parents convince their kids to eat breakfast — as well as eat it themselves!

Most kids are very focused on the present, and they just won’t be motivated with any talk about health risks decades down the line.  But they’re much more open to data showing how breakfast-skippers not only gain more weight, but they also do worse in school. So if you have an overachiever child who runs out the door in the morning without breakfast, show them the studies showing that breakfast skippers perform worse in school exams.

And here’s an important tip for parents whose child is terrified of gaining weight and skips breakfast: children who skip breakfast actually end up more obese than those who eat breakfast! The main reason for this is mostly because breakfast-skippers get very hungry by lunchtime and end up binge-eating more, usually with less healthy mid-morning snacks and bigger lunch portions. Also, because their metabolism is in a partial fasting mode without breakfast, the body stores more energy from foods as fat, instead of just breaking it down to glucose for your brain and muscles.

Adults also don’t get a pass for skipping breakfast, as they get the same slow weight gain as kids do. The importance of eating breakfast was impressively covered in the Childhood Determinants of Adult Health Study. In this fascinating study from Australia, researchers asked 2,000 school children about their breakfast habits, then followed up with them 20 years later and assessed their health. The results were striking; those kids who skipped breakfast all those years had a larger waist — by 2 inches! These same kids as adults also had higher insulin levels, which leads to more diabetes. They also had higher total cholesterol and the “bad” cholesterol, LDL — both of which cause clogging of the arteries and lead eventually to heart attacks and strokes. Another long term study, this time from Japan, followed 82,000 people for 15 years and found that the breakfast-skippers have a 14% increased risk of heart disease and 18% higher risk of strokes.

And for those of you worried about diabetes, or told you are prediabetic, it’s very important to follow the usual advice to have small, frequent meals instead of one or two large meals. Another excellent study, the Health Professionals Follow-Up Study, followed 29,000 American men for 16 years, and found that the breakfast skippers had a 21% increased risk of developing diabetes.

The type of breakfast is also important. The main research suggests what is obvious to parents — that simple sugars in sweetened cereals are much less healthy than high-fiber, more complex whole-grain cereals as well as fruits, nuts, and dairy products. Those quick energy bursts from the sugary cereals give kids a quick “high” which just as quickly wears off, and their brains and body are dragging along come lunchtime.

My advice for those of you who skip breakfast because “I have no time”: at least try to have a cup of yogurt with some fresh berries and cereal in the morning. You can throw it in your bag, along with a banana, and eat it on the way to school or work. Yogurt by itself is a superfood with its calcium and probiotics, and daily yogurt actually helps you to keep your weight stable. And blueberries are packed with healthy antioxidants and fiber.

So, the next time your kids are trying to run out the door before breakfast, sit them down in front of a bowl of Wheaties with yogurt and tell them how breakfast helps with better grades as well as better health — now, and in their futures.


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Sleeping Troubles? Maybe This Can Help.

Recently we had National Sleep Awareness Week, so it’s a good time to review healthy sleep habits. I see a lot of adults and teens in my clinic who are chronically tired and have troubles sleeping — both falling asleep and staying asleep.

How Much is Enough?

According to the National Sleep Foundation’s research, here’s the amount of sleep we need:

  • Newborn (0-3 months): 14-17 hours
  • Infant (3-12 months): 12-15 hours
  • Toddler (1-2 years): 11-14 hours
  • Preschool (3-5 years): 10-13 hours
  • School age (6-13 years): 9-11 hours
  • Teenager (14-17 years): 8-10 hours
  • Adult (18-64 years): 7-9 hours
  • Older adult (>65 years): 7-8 hours

One of the main problems with insufficient sleep is the daytime sleepiness, an obvious consequence of not sleeping enough. A fascinating series of tests in children showed that insufficient sleep and daytime sleepiness both lead to worse school performance. Most of these children went to bed at 9-9:30 am and almost all got up at 7 am, causing a daily sleep debt of 1/2-1 hour for many children. While that may seem like a small amount, like any debt, it must be paid back, and most children cannot recover all of this lost time by sleeping late on weekends.

One good bit of news from the same study describes how delaying school start times even by just a half hour can significantly improve sleep duration and daytime sleepiness. In their interventional study with six primary schools in Shanghai, delaying school openings from 7:30 to 8 or 8:30 gave the children almost an hour of extra sleep — and more importantly, less complaints of daytime sleepiness. This fits with studies in other parts of the world and supports the growing movement, led by pediatricians, to delay school opening times to 8:30 am. Just doing this could allow better sleep and improved test scores for all students!

Besides school performance, poor sleep also leads to an increased risk of overweight and obesity in children (as well as adults). A 2007 meta-analysis of 36 studies across the world showed a strong, independent association between short sleep duration and weight gain in children, which continues into adulthood.

For adults,  poor sleep can cause long-term problems with high blood pressure, depression, diabetes and obesity. It can also cause dangers such as sleeping behind the wheel or more errors at work (medical training and internships are notorious for this, as are night shift workers driving home).

My tips for sleeping well

Get all screens out of the bedroom. Technology is changing so quickly that it’s difficult for research to keep up. But it’s clear that many people are having a lot more sleeping troubles when using their iPads and cell phones at bedtime. It’s partly because their backlight alters our sleep hormones, but also it’s distracting us with answering text messages even after lights out. I think a great general rule, for adults and kids, is no screen time two hours before bedtime (that includes TV), and definitely get all screens out of your bedroom while you sleep.

Exercise often — but early. Exercise has been shown to improve sleep habits, but only if done at least four hours before bedtime. Otherwise, you still may have too much metabolic energy and will have trouble falling asleep. This is also a good tip for kids who are having sports practices late into the night.

Avoid alcohol and smoking before sleeping. Alcohol is a major cause of insomnia for many. Drinks will certainly make you sleepy, but your body will rebound and wake you up in the middle of the night. It’s far better to have only a drink or two, at least 2 hours before bedtime. Smoking causes the same problems; that initial relaxation quickly wears off and the nicotine stays in your system for hours.

Caffeine is another major cause of poor sleep. As we get older, we cannot handle the triple-shot cappuccinos which we had in college, and it’s very common to have poor sleep with any caffeine drinking after lunchtime. So if you’re having light sleep, definitely take a look at your caffeine habits first; any tea, sodas or coffee after lunch may be keeping you awake. If you must have your afternoon coffee, at least try to switch to decaf.

Other tips include not staying in bed if you can’t sleep. If you can’t fall asleep, after 20 minutes of trying you should get up and try to relax in another room. Staying longer in bed generally makes you more anxious, making it even harder to fall back asleep.

Take a nap. Napping, even if only 20-30 minutes when needed, has been shown to have great benefit for short term memory and concentration. As I get older, I definitely lag more in the afternoon, and a 15 minute power nap at lunch really helps me get through a busy clinic afternoon (as does a lighter lunch).

What about natural medicines and non-prescription pills? Many people use over the counter pills such as Tylenol PM. It does work well, in the short term, for many people — but I strongly advise not taking it regularly, as the Tylenol component is totally unnecessary and can cause liver problems if taken chronically. If you must use this medicine, please buy only the active ingredient, diphenhydramine (Benadryl) separately and only use that. As for natural medicines, melatonin works for some types of insomnia but is rarely very effective. Others may consider an herbal capsule with valerian and other compounds such as passionflower, hops or lemon balm.


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Rubber Ducky You’re The One — To Cause Diabetes and Cancer?

My boys are now both over two years old, but they still like the occasional chew on their toys, which are mostly made of plastic. Rubber duckies, Lego men, Brio trains — it’s still a ton of fun to put in their mouths if it makes mommy and daddy really mad. I choose my battles with them, but I try to stop them partly because I’m worried about the chemicals in the plastic. Surely, microscopic parts of that plastic must be getting into their systems? One set of bath toys was very typical, made in China but exported to America, from a company vowing they are “safe and dependable”, with standards that “meet and exceed” US laws. What exactly does that mean? What are these laws? Should I be worried? And just how well can I or any parent protect our children from all environmental harms?

When I think about our modern world’s reliance on chemicals and plastics, I’m reminded of what Donald Rumsfeld called the “known unknowns” – we know that we understand almost nothing about the safety of the 80,000 consumer chemicals created since World War II, because they’ve never been required to be tested on humans. As the WHO states in their 2012 report State of The Science of Endocrine Disrupting Chemicals, “the vast majority of chemicals in current commercial use have not been tested at all.


The chief concern is that some of these chemicals are endocrine disruptors, which are chemicals whose molecular structure is similar to our natural hormones. With this mimicry, they can bind to the same receptors that our natural hormones do, thus altering our normal endocrine activities which control  just about every aspect of our health. We are mostly worried about children because these endocrine disruptors could cause permanent damage during our most sensitive growth spurts: while still developing in the womb, and later during puberty. The most notorious example of an endocrine disruptor is diethylstilbestrol (DES), a synthetic estrogen which was given to many pregnant women in the decades after World War II as a treatment to prevent birth complications. But slowly it became clear that many newborn girls of these mothers were getting a rare vaginal cancer, and DES was banned and declared a carcinogenic — but even right now many of these same “DES daughters” are continuing to have reproductive health problems both for themselves as well as in their own children, which means some endocrine disruptors can permanently alter our DNA, affecting generations.

The US Endocrine Society published an even more damning document, their 2015 Scientific Statement on Endocrine-Disrupting Chemicals, which concludes that

…there is strong mechanistic, experimental, animal, and epidemiological evidence for endocrine disruption, namely: obesity and diabetes, female reproduction, male reproduction, hormone-sensitive cancers in females, prostate cancer, thyroid, and neurodevelopment and neuroendocrine systems.

The prestigious JAMA Pediatrics published their own review of endocrine disruptors in 2012, essentially agreeing with the WHO’s assessment that while hard data on humans isn’t very strong, there’s enough concerning data to conclude that “efforts to reduce EDC exposure as a precaution among pregnant women and children are warranted.” Chemicals such as BPA, PVC and phthalates are most often mentioned as causing harm in boys and girls, associated with infertility, obesity, cancers and neurodevelopmental problems such as behavioral issues and a lower IQ.

Plastic ID Codes and Properties. Source:
Plastic ID Codes and Properties. Click to enlarge. Source:

So what can we all do to protect ourselves? After all, everything we touch almost literally has plastic as part of it. I’ve found a few consumer groups and blogs that offer helpful advice for worried parents. My favorite is The Soft Landing blog, which has a very useful collection of safer product shopping guides. The Pediatric Environmental Health Specialty Unit also offers similar advice. Here’s a small summary of what most are advising:

  • Try to buy products (especially for babies) that are free of BPA, phthalates and PVC (The Soft Landing website has great blog lists).
  • Switch all your plastic food containers to glass.
  • With the Plastic Coding System, avoid numbers 3, 6 and 7 and try to use numbers 1,2,4 or 5.
  • Consider buying organic produce to reduce exposure to pesticides..
  • If you must use plastic cling wrap, only use PE wrap; minimize contact of cling wrap plastic with the food; and try not to microwave with the plastic on it. Especially don’t let the plastic sit on top of liquids, whether cold or hot.
  • Reduce indoor dust exposure by cleaning carpets and dusty surfaces regularly using a vacuum cleaner with a high-efficiency particulate air (HEPA) filter.
  • Always immediately transfer your restaurant leftovers into glass containers at home, and never reheat your leftovers or eat directly from takeaway plastic containers.

We’ve put most of these into practice in our home, so I feel a bit less stressed about this issue.  And the boys’ bath toys? While The Soft Landing blog reassuringly listed them on their list of safer bath toys, their own company rep emailed me to confirm they are “BPA-free, phthalate-free, and non-phthalate PVC”. So I am letting them munch away — for now. Choose your battles…


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先介绍一位朋友:美国儿科医生Richard Saint Cyr.中文名字叫“圣西睿智”

可能有的宝妈从微博就知道他的:Richard 是美国的医学博士,专业领域是儿童保健。他从2008年就来到中国,在北京的一家私立儿科医院工作。因为最近“雾霾”持续不断,Richard就在他自己的网站,以一个儿科医生的角度,同时也是在北京生活接近十年的“中国通”的角度,对几款“口罩”和“空气净化器”做了测评和分析。这些分析文章,虽然是一家之言,但可以给宝妈很好的参考。因此我们口袋育儿专门联系了Richard,获得了他的授权发表。


每天都有人在问我哪种口罩更好用,针对这些问题我近期跟3M研究团队进行了一次探讨,谈话非常愉快,他们非常乐于让我试用他们在北京实验室的“口罩密合度测试仪专业版”TSI Portacount Pro+。这是一款正式测试口罩与人的面部密合度的机器,非常广泛地被使用。


某个雾霾严重的日子(常见的AQI危险级别指数150以上),我找来了9个不同的口罩来测试:3个3M款、另外是totobobo、Vogmask威隔、Respro Techno、艾凯贝Honeycomb款、绿盾和外科手术口罩。









测试结果排中间的,即效率在80%-90%之间的,按结果顺序为艾凯贝Honeycomb87%,Respro Techno85%,之后是我第二次测试3M的9001V84%,然后是totobobo的80%。








我也测试了一下那些在中国生活的外国人中常见的口罩,对我而言结果也让人失望,没有一个效率超过90%的——除了威隔口罩,Respro’s Techno的过滤芯是通过欧洲FFP1认证的,意味着有78%的过滤效率,我试戴的效果比这个效率更高些。但是考虑这款口罩的昂贵价格,我还是不会考虑将它列为日常标配,况且我还有6元一个效果缺更好的呢,而且这一款我带上去还很不舒服。总体来说,78%的防护效率在中国是完全不够的,仅仅FFP1认证的口罩是完全不能满足要求的,况且还有很多其他的口罩效率相较好很多。在北京日均雾霾指数90毫克/立方米的空气中,一个FFP1标准的口罩最多让你呼吸到20毫克/立方米的空气,依然没有达到10或以下(相当于健康的AQI值50以下),我的目标值。







我想再次强调我之前曾经说的话:你所需要的全部就是一个优质的过滤器和一个马力强劲的风扇。没错,就是过滤器+风扇。优质的过滤器是最重要的,最好是有官方认证的“高效颗粒物过滤器” (HEPA)—-在美国这意味着对PM0.3有99.97%的过滤效率。欧盟的定义标准比较宽泛,HEPA过滤效率从85%到几乎100%(见后面说明)。PM0.3是指粒径不大于0.3微米的颗粒物,比PM2.5差不多小10倍;这么小的尺寸被认为是对我们人体最危险的,因为它最容易侵入我们的肺,对人体造成最大的伤害。



我们大部分用户,包括我在内,在家庭卧室里使用的高价净化器,也同样是“风扇+过滤器”的应用概念。如果机器始终处于低噪声的速度运行时,那么它们的空气循环量会远小于机器本身推荐的 “洁净空气输出量”(CADR),“洁净空气输出量”(CADR)实际上不过是生产厂家自己做的测试,而不是不是卫生监管机构做的检测。而且,机器开到最大挡位时通常噪声实在太大了,没有人会这样使用,尤其是在卧室里。“洁净空气输出量”(CADR)测试实际上仅仅只是20分钟的运行数据!对于在中国的消费者来说,这完全是不切实际的,因为人们需要机器全天开在静音速度挡位,这样不会妨碍谈话和睡觉。



颗粒物平均清除率(数据源自Smart Air Filters网站实验结果)


八年前,当我第一次来到北京时,市面上净化器种类很少,只有一两个品牌可供选择。可如今,短短的几年时间里,几百个新品牌净化器如潮水般涌入市场。当浏览中国购物网站时,我和你的感觉一样,净化器多得实在是令人眼花缭乱、目不暇接。可是,我们却几乎找不到任何关于对净化器的独立测评(此前我写过一个,本文是另一篇)。我选择测试的机器的顺序条件如下:首先价格要低于1千元;然后是著名国际品牌>中国品牌>配置HEPA过滤器(或品质接近):风扇风量(洁净空气输出量CADR)至少要满足我办公室的需求,即房间容积X 5ACH(每小时空气转换次数),21m3X5=105m3/hr空气量;最后补充一条就是具有过滤甲醛和挥发性有机化合物的能力,但这不是我的首选项。配有单独的预过滤器的净化器是有益的,但千元以下价位却很难买到。按照上述原则,我遴选了以下几种机器进行测试:

  • 聪明空气Smartair DIY经典型:200元;过滤效率:9% PM0.3;CADR(洁净空气输出量): 未知; 服务面积:11-20 m2
  • 瑞士风Air-O-Swiss P320: 699元;过滤效率:97% PM0.3;CADR :86 m3/h, 服务面积:16 m2
  • 松下F-30C3PD-D: 599元;过滤效率:99% PM0.3和89% 甲醛;CADR:163 m3/h, 服务面积:30 m2
  • 飞利浦 AC4025: 699元;过滤效率:2% PM0.3和 95% 甲醛;CADR:127 m3/h
  • 美的 KJ20FE-NH3: 750元;过滤效率:9% PM0.3和 87%甲醛; CADR 204 m3/h, 服务面积20 m2
  • 小米: 899元 (代理商网上售价1,000-1200);过滤效果3% PM0.3和 91% 甲醛;CADR:406 m3/h, 服务面积:48 m2


我的诊所办公室是主要的试验场地,一个舒适的建筑面积为9.6平方米(容积21.3m3)的房间。对于这样的小空间,若使用一个巨大的布鲁雅尔(BlueAir)净化器或类似的大机器不但要花一大笔钱而且要占用宝贵的地面空间;因此我想测试一些较小的机型。我在午休时间测试这些机器,先让室外空气涌入房间后,关上门窗。然后测试它们在最大速度时的性能,我的关键数据采集节点分别在10分钟和50分钟,用我的超值神器—Dylos 1700型颗粒物检测仪来测量PM2.5和PM0.5的浓度下降百分比。在其余的工作时间里,我会把他们设定在标准的更安静的运行模式,并做随机抽查。我办公室的所有测试结果见下面的表格,其要点如下:

  • 所有机器在最大速度下的关键指标都表现不错—-50分钟5去除率范围在88~94%之间. 有的机器达到净化效果的用时更短些,小米的大风扇一发威,只用了10分钟就已经去除了88%PM2.5和PM0.5。据此可以判断,风扇与过滤器同样重要,而且小米的CADR值406m3/h是同类机型竞争者(美的)的两倍。
  • 关于小米的测试过程我需要澄清一点:因为它的最大速度模式只能持续15分钟就自动切换回自动模式,所以很难获得与其它机器进行比较的50分钟对照数据,因为它只有开始的15分钟是开在最大速度。但考虑到它在10分钟内最大速度时的突出表现,可以推断,如果它可以持续开在最大速度,表现应该一样好。
  • 瑞士风(The Air-O-Swiss)320是最小的机型,CADR只有86m3/h,达不到我所需要的105m3/h,数据显示,它的表现还不赖,可能它的350型更有效,但是这个型号超出了我设定千元以下的价位。
  • 松下和飞利浦也都表现很好:只是对我而言,松下刺眼的橙色外观太不专业了。飞利浦的绿色尚可,特别是在儿童房,但也不是最理想的。
  • 美的的黑白造型很漂亮,我可以大大方方地在办公室摆出炫一下。它的块头尺寸和风扇速度都较大,这一点在良好的测试结果尤其是在对付5方面得到了证实。
  • 聪明空气(The Smartair)DIY经典型:200元DIY的过滤器+风扇,表现至少和比它贵的整机一样好,它的瑕疵是对付5的显得有些力不从心。虽然它外观长相看起来不够专业漂亮,但对我来说使用还是可以的。尤其是对于学生或是低收入者来说,用它总比什么都不用要好得太多(见我先前的文章)。
  • 所有机器在最大速度下的噪声都无法忍受一整天,但在比较安静的运行模式下,在办公室里面感觉都还好。



Xiaomi, meet Blueair

我卧室里一直是用大机器,一台布鲁雅尔(Blueair)503和一台IQAir Pro150。我想现在是用又便宜又小的机型挑战它们的最佳时机(和去年飞利浦机型测试类似)。这次测试与之前的测试不同之处在于:之前一直是测试比对室内和室外的空气;这次,我想看看它们超过8小时过滤效率效果。就是在整个房间充满污染颗粒物后,关闭门窗,自动连续监测。把精油置入蒸发器—­­这家伙可以使房间的空气污染指标快速提升到骇人的水平。另一项测试是记录最终一小时的数据,观察在大部分时间里它们是否能使我室内的空气质量处于安全值内。




  • 8小时标志时间净化效果,大部分机器表现很好。对于5,布鲁雅尔(Blueair)过滤效率达到99.9%,小米在睡眠模式下的过滤效率达到99.8%,与之非常接近,其他大部分机器在98%~99%之间。对于更小的颗粒物PM0.5,布鲁雅尔(Blueair)过滤效率达到99.9%,接下来是飞利浦的99.6%和小米的99.5%。
  • 1小时短时净化效果,因其巨大的风扇所赐,奥郎格(Airgle)的表现令人非常满意,净化能力大于房间所需。然而,预算内的机器如小米在自动运行模式和美的在低速运行状态下,表现也毫不逊色。(小米在自动运行模式下更省电,在提高速度对付更细微的颗粒物时噪声稍大,会有短时吵人的感觉;而美的在低速运行时,对于睡觉来说,噪声就太大了,还好,静音睡眠模式的过滤性能表现也非常不错。)
  • 另一个有用的评价标准是最后一小时的检测数据(每立方英尺颗粒物浓度/ 100):我的目标值是5保持在50以下(Dylos检测仪检测数据),这大约相当于10μg/m3(或空气质量指数AQI<50)。好消息是,每台机器的最终结果都远低于50,其中包括两种便宜的型号。对于很难控制的更小的颗粒物PM0.5,我不太清楚目标值,但来自我的环境测试公司(Environment Assumed)的查利.汤普森认为:Dylos检测仪检测PM0.5在1000以下基本等同于空气质量指数<50)。按此计算,无论是飞利浦和布鲁雅尔(Blueair)确实做的最好,其次是美的,小米第三。更令人惊讶的是奥郎格(airgle)和爱客(IQAir),这样的大牌机器却有超过1000的数据记录。
  • 整体性能,所有三个较便宜的机器用优异的表现证明了自己,即使与大牌机器比较,他们的性能也没有明显的劣势。美的展现了令人印象深刻的数据(即使在非常安静的睡眠模式)。小米也表现很好,在自动模式下,不论是长时间净化还是短时净化,效果都非常好。从非常低的最后一小时检测数据上看,飞利浦也表现很好(但测试当晚室外空气质量也很好,可能有助得出较低的数据)。对于三个昂贵的大牌机器,理论上应当胜过便宜的竞争对手,但只有布鲁雅尔(Blueair)的表现显得鹤立鸡群,5和PM0.5两种颗粒的检测数据都是最低的。

空气净化器净化测试结果—卧室(40m3). *Dylos测试仪检测PM2.5<50,PM0.5<1,000为目标值,检测数据每立方英尺颗粒物/100




我必须再谈一谈关于小米空气净化器,虽然它仅上市三个月,但很可能颠覆整个行业—-因其新颖的设计和令人难以置信的价格。小米有一个很酷的功能是其他所有的机器所不具备的,就是小米的APP应用;小米的机器有内置WiFi,可以链接到智能手机的APP应用,用户可以通过手机控制机器的速度以及获得室内对比室外的空气污染实时数据(中国环保部每小时的数据)。这个APP 应用甚至能发送手机短信告诉你“室外空气现在比室内空气清洁,该打开窗户透透气啦”!它也能为你实时计算出过滤器的剩余使用寿命。这真是超酷的功能,虽然这有点炒作的噱头,但这却是我第一次体验了“互联智能家居”的概念,WiFi互联化的家电,我亲身体验到了这些数据的价值。







2017-01-09 Richard Saint Cyr 口袋育儿). 文章来源:


This post was originally republished on my new Chinese-only blog at (please also follow my Facebook page) .