Ever since I moved into this house, I have always felt that the stuffy air is not circulating. I bought a formaldehyde detector for prosecutors a while ago. 0.130 tvoc equals 1.351. Air pollution is really scary so I need to buy an air purifier. There are many patterns to look for. I originally bought a small one and was afraid the air purification wasn't good enough. I chose this big one. Although the sound is a bit loud when it is on, the cleaning effect is still clear. Hcho0.130 immediately falls to around 0.065. Green light on tvoc1. 0.351 also dropped to around 0.600 now rest assured
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