冬季室内干燥，不少市民选择购买加湿器来增加空气中的湿度，进而起到净化空气的作用。不少市民给本报打来热线电话反映：“我们经常使用的加湿器，会不会对室内环境造成污染？有人说，若使用不当反而容易造成二次污染。这到底是怎么回事？”为此，记者在专业人士的协助下，通过一组实验发现，加湿器的不当使用的确会增加室内空气污染。

Winter indoor dry,Many people choose to buy humidifier to increase the humidity in the air,Then play the role of clean air.Many people to call our hotline reflect:"We often use the humidifier,Will cause pollution to indoor environment?Some say,If use undeserved but easy to cause the secondary pollution.What's this all about?"therefore,Reporter in the professional assistance,Through a set of experiment found,Improper use of humidifier can really increase indoor air pollution.

实验之前 Before the

工作原理： Working principle:

用高频超声波将水雾化 With high frequency ultrasonic will water atomization

　　超声波加湿器因为物美价廉，且操作方便，已经成为越来越多市民的选择，其工作原理就是采用每秒200万次的超声波高频震荡，将水雾化为1微米到5微米的超微粒子，通过风动装置，把水雾扩散到空气中。

Ultrasonic humidifier for good quality and low price,And convenient operation,Has become more and more people choose,Its working principle is to use the 2 million times per second the ultrasonic frequency concussion,Will water mist into 1 micron to 5 micron superfine particle,Through the pneumatic device,The diffusion of water into the air.

　　本次实验中，记者分两次进行了测试。一是先对空气进行净化，然后打开加湿器，测量不同地点空气中PM2.5的含量；二是将三种不同的水加入加湿器后，并让其工作，随后对其周边空气进行细菌采样。

The experiment,Reporter in twice were tested.One is the first to air purification,Then open the humidifier,Measured in the different place air PM2.5 content;The second is to three different water after join humidifier,And let it work,Then the surrounding air bacteria sampling.

实验过程 Experimental process

空气取样后进行细菌培植 Air sampling after bacteria culturing

　　记者在苏州贝昂科技有限公司北京体验馆工作人员的帮助下，对超声波加湿器产生的PM2.5进行测量。测量前，记者先对加湿器周边的空气进行了净化，当空气质量检测仪上显示的PM2.5数值为0后，记者打开了超声波加湿器，测量距离分别为30厘米和1米。(如图1所示)

Reporter in suzhou BeiAng technology co., LTD., Beijing experience museum staff help,Ultrasonic humidifier to produce PM2.5 measurement.Measurement before,Reporters first to humidifier surrounding the air purification,When the air quality detector shown on PM2.5 numerical zero after,Reporter opened the ultrasonic humidifier,Measuring distance are 30 centimeters and 1 m.(As shown in figure 1 shows)

　　测量时，记者发现空气质量检测仪上的数字一直是波动的，在30厘米的距离，PM2.5最大数值为435，1米距离时，PM2.5数值有了明显的下降，变成175。30分钟后关闭加湿器再进行测量，检测仪上的数字一下子降低，只有30多。

measurement,Reporters found that air quality detector on the digital has been fluctuating,In the 30 centimeters of distance,PM2.5 maximum value for 435,1 meter distance,PM2.5 numerical have significantly reduced,Into 175.30 minutes close humidifier measured again,Detector on the figure of a lower,Only more than 30.

　　记者分别将凉白开、自来水和蒸馏水注入加湿器中，并对距离加湿器5厘米附近的周边空气进行细菌采样。其采样时间分别为，刚开始启动加湿器，启动5分钟时以及启动30分钟时。记者将采样用无菌蒸馏水稀释后，滴到菌落总数测试片上，并放入恒温培养箱培养24小时。(如图2所示)

Reporter from cold boiled water/Tap water and distilled water injection in the humidifier,And the distance humidifier 5 centimeters around the nearby air bacteria sampling.The sampling time is respectively,Just started the humidifier,Start 5 minutes and start 30 minutes.Reporters will be diluted with sterile distilled water sampling,Drip to the colony total on the test piece,And in constant temperature incubator culture 24 hours.(As shown in figure 2 shows)