要是把窗户打开,空气净化器是不是没用?

SmartAir聪明空气

我们以往的测试显示了在门和窗户都关上的情况之下,室内的颗粒数是大约室外的五成。对有些人而言,开窗只是个民间风俗。但对有些人呢,这是因为有室内的空气污染,例如:新的家具或装修。

那,要是我们将窗户打开,空气净化器是不是完全没用?CK(Smart Air研发工程师)便在SmartAir办公室使用大炮在12 平方米的卧室做了6次测试(次窗户属于打开状态,3次窗户为关闭状态)。

测试

这问题最关键的时候就是室外空气污染特别糟的时候,所以,CK选择了室外空气非常差的两天(2月14和15日)进行了测试。根据美国大使馆的数据,这两天的AQI分别是239 和290 。

为了保证测试条件,CK先将窗户开了,让脏空气先流进来,直到室内的空气和室外的一样脏为止。

然后,CK将大炮开了20 分钟。头三个测试是将窗户打开的,另外三个是将窗户关上的。

窗户打开

窗户关闭

结果

窗户关上时,大炮在20分钟内消除了90% 的0.5微米以上的颗粒。但窗户开得时候,大炮只消除了大约60% 的颗粒。

窗户打开时vs窗户关闭时的PM2.5含量

数据显示了关上窗户效果会比较好。那当然啊!但,有趣的是,就算把窗户打开,空气净化器还是有一定的效果的。

结论

将窗户关上室内的空气可以达到安全的水平。可是,如果房间有太多的VOC 或二氧化碳,需要将窗户打开,以便空气流通,我们还是同时可以减少颗粒污染的。换句话来说,将窗户打开并不会降低空气净化器的清洁量,但是需要花更长的时间达到PM2.5安全上限(可能在极端恶劣天气会难以达到),开启空气净化器时候的空气质量总比完全没开空气净化器要好。

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在 “要是把窗户打开,空气净化器是不是没用?” 上有 4 条评论

  1. Very interesting test!

    It would also be interesting with different scenarios, like low pollution days, and the window only slightly ajar, which is how most people probably keep their windows. Also, a longer time frame would be interesting, to see where the levels stabilize.

  2. Thanks for this. Down here in Hong Kong, the pollution levels aren’t usually as dramatic as those of Beijing, but they’re certainly nothing to be satisfied with. The willful ignorance of many Hong Kongers and obsession with “ventilation”, coupled with the government’s distorted AQHI which doesn’t reflect international standards, means that people nonchalantly keep windows open when they really shouldn’t. I’m the only foreigner in my workplace and am really struggling with colleagues who insist on windows being open to let in the “fresh” air now that it’s cooling down, which is when the pollution really sets in. I’ve got an air purifier next to my desk, so thanks for giving me some comfort to know that it’s doing something. I’m gearing up for a clash if we have any really bad air days and they still insist on the windows open!

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