> I bought a meter and started monitoring after reading an article similar to this one. Which meter? (I'm asking because I have a bad experience with a device

> I bought a meter and started monitoring after reading an article similar to this one. Which meter? (I'm asking because I have a bad experience with a device from Aliexpress that turned out to produce fake air quality measurements. Though it did not claim to measure the NO2 pollution which the article talks about.) edit: the uHoo seems to be an expensive device that promises to measure a bunch of stuff, but it cannot be calibrated. I would not trust it.