为什么不用测试就知道有甲醛？
先不用测试，如果能闻到装修味道就有VOC的问题。
我高中的时候，就发现甲醛有很浓的味道。疾控中心也这么说。
但是为什么我说你不一定非得去测试它呢? 因为我个人很喜欢做测试！我经常在家里测试空气。
此外，淘宝上还有一堆不到100元人民币的甲醛测试机。所以为什么不呢?
用“甲醛测试仪”测出的东西，其实数据不一定是甲醛。
淘宝上“甲醛测试仪”测到的是一大系列的各种各样的东西，包括有害气体和无害气体。实验中，甚至包括橙子，面包都有毒？？
如果你有一台，你可以做一个小实验：在测试仪附近吃个橙子，测试仪就会报警，可以看看我做的甲醛测试视频。
“甲醛测试仪”会对很多无害气体有反应，比如橙子、鲜花、花生酱。所以测试仪其实并不是很准确。
好的，还有测试的另一种选择: 采集空气样本，送到实验室进行测试。其实这样也可以，但这比较麻烦，而且还花钱。
我买了很多测试仪做了测试之后，我的建议是：虽然听起来不科学，我们的鼻子其实是挺好的测试仪。科学家做过实验，让普通人试图用鼻子测试，结果是可以识别出特别低浓度的甲醛。
我们的鼻子能闻到什么程度的甲醛呢？
美国疾病控制中心说甲醛水平到0.1 PPM要担心（2），正好是普通人能闻到的程度。
如果能闻到，就几乎可以确定有问题，不需要弄得更复杂。
划重点：甲醛测试
虽然听起来不科学，但我们的鼻子其实是挺好的测试仪。市面上的甲醛测试仪其实并不是很准确。
Smart Air
Regarding the orange, the limonene in it reacts with the ozone in the air and makes formaldehyde, so it would be expected to register wouldn’t it ..tho not at a dangerous level I suppose. Interesting idea to use your nose, I like it! The only thing is we become immune to smells and only really notice changes, so you’d need to leave your room/house for a while and return. Not really a problem tho
Thanks for the info, I’m trying to find a good formaldehyde sensor / detector, and am buying a few to test, much like you did I guess.
Check the latter part of my response to Emma. I think it’s the best way to check if a device is accurate. Better yet, if you can afford it, just buy the pro machines. Good thing about that is that you can lend to your friends and even provide services to others in the neighborhood using those!
How about those chemical test kit for formaldehyde? Are they accurate?
The self-test boxes are good for comparisons of formaldehyde levels between rooms and apartments, not so good for accuracy. The one I use is BCoole which you can get on Taobao. I would recommend, for example, doing one control test using one of the box tests in an apartment where the air quality is good (aka: you can breathe and stay days in without feeling unwell, say, in a friend’s house), and then doing a few more in the spaces of the apartment or unit in question (the problematic one). You can then compare the resulting colors in each with the other, as well as to the color key for level comparisons. So if say, you get a 0.03 for the control space (the friend’s place) and a 0.06 in the new place, you know there is double the FMD in the latter. The numbers may not be all that accurate, but the comparison is useful. Better yet, have two control tests before testing the place in question, one of the friend’s place and one of a place you KNOW is high in formaldehyde or that makes you sick. This way you can gauge the results better. That is what I do with the box tests. Otherwise, hire a CMA certified air quality testing authority in the city you live and they can give you a much more accurate test, but you have to pay quite a bit – I believe the pricing in my city in 2022 is around RMB 1000 for one apartment (3 testing spots). Those are definitely accurate. If you have bought a handheld device, you could always check the results against the CMA test to check if your handheld device really works. I heard very few works in the market except for a Japanese one that costs a lot (I believe more than RMB 15,000? Otherwise, I also sometimes think maybe there is a way to get a hold of a professional device (the ones on tripods – the kind the testing companies use). They work just like the self test box in that chemicals are used but rather than you eyeballing the colors, they have a reader to read the test result. Everything is more accurate.