#3 I know how the air quality is at my place from the app 13 October 202213 October 2022 by Yiu Fung YIPin Featured Tom: Hey, I brought a cute air quality monitor. Let’s plug it in the living room and check the situation. Mom: WHAT?! Why did you buy this? That’s a total waste. I already have an app to know the air quality. Tom: You mean checking on the station nearby… it’s few kilometers away from us. Mom: Yes. They are installed by professionals, and you see the pollutants list in the app. What else do you need?Tom: Mom, I trust the data. But outdoor air pollution changes from street to street because of the air flow in the city. And I’m interested by indoor air pollution which is linked, but has additional elements. Mom: You mean the air quality could be a big difference between the one in town and this one at home? I thought they were the same.Tom: Yes, CO2 is a good example, we breathe out CO2 and it could be a health issue if it accumulates in badly ventilated spaces. And you have almost no CO2 issue outdoors. Mom: WHAT?! Then why did you just have one!!! You should buy one for each of us!!!