负离子空气净化器真的有效吗?

知乎上有人问负离子空气净化器是不是真的有效。我觉得这个问题很重要,因为现在市场上都是负离子空气净化器。

 

Ionizers 1

 

经常也有人给我转发这类产品介绍,问我这样的机器是不是有效:

 

Ionizers 2

 

净化神器!Wow! 30秒钟就有洁净空气吗?而且能去除甲醛?CCTV认可?卖过5万多台?太棒了!比DIY空气净化器还便宜有效,我也要一台。

 

负离子发生器的工作原理是什么?

不过话说回来:为什么会有人卖这种产品?是蒙人的吗?

假如这是我的北京卧室,卧室里有负离子发生器,空中有颗粒污染物:

 

Ionizers 3

 

负离子发生器开机之后,机器会发出负离子:

 

Ionizers 4

 

因为静电,这些负离子会让颗粒附着到墙上、床上、地上:

 

Ionizers 5

 

如果有空气测试仪,会显示空中的颗粒比以前少。成功了!

 

等一下#1

科学研究发现,市场上的负离子发生器不够强,基本上起不到作用。如果要起到作用,需要用特别强的负离子发生器–需要比市场上的要强。

 

等一下#2

OK, 如果普通负离子空气净化器没作用,我们也可以用一个更强大的。问题是,那么多负离子会产生臭氧。臭氧对人有害。

 

等一下#3

即使你不在乎臭氧问题,你也应该发现到这些颗粒没有被过滤掉。负离子净化器只是让这些颗粒物贴到墙上、床上、地上。我想让这些颗粒附着在我的床上吗?

 

有人测试过北京的空气污染,研究这些颗粒到底是什么。除了灰尘以外,这些颗粒还包括铅、镉和砷–我不想让这些颗粒附到我的枕套上!

就算我不介意让这些颗粒附到我床上,还有另外一个问题。假如我回家:

 

 

Ionizers 8

 

因为负离子净化器有这么多问题,美国独立非营利组织发表了报告让消费者避免负离子净化器。一个叫Sharper Image的厂家起诉了;《消费者报告》赢了

 

结论

下次如果有朋友给你转发“净化神器”的信息,记得屏蔽这些信息。已经有被验证过的净化器配件:HEPA滤网。HEPA能捕捉这些颗粒,而不让它们贴到床上。这是我用Dylos测试仪在北京做的一个小测试:

 

 

The Sqair air purifier Kickstarter

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Chris

I read that HEPA filters cannot capture PM 2.5, is this right?

Definitely not, Chris! HEPA filters can capture over 99% of all particles above and below 0.2µm. That means PM2.5 is definitely included in the types of particles HEPA filters can capture. Check out this specific article on whether air purifiers can capture PM2.5

Rollie

I am looking for a reasonably accurate and priced PM2.5 tester for use at a small school and my home. Under $200?? can you help. There are many out there.

Yes, you’re right! There are so many air pollution monitors on the market it makes it difficult to sort through them. We did some tests on three reasonably priced air pollution monitors, you could check out that review!

Ryan Lichtenwalter

I have had great experience with a from Taobao, which I validated against official measurements. I suppose the entire line uses the same detector and circuitry, so while individual experience may vary, it’s worth trying at roughly 140 CNY, 20 USD.

https://item.taobao.com/item.htm?id=578487155548

I only validated its PM2.5 measurement.

It’s the VSON Technologies WP6910.

http://www.vson.com.cn/Product/0239474841.html