I currently live near a busy intersection and I wanted to some for of measurement of PM2.5, PM10 as from what I've read, car pollution are the main culprits of these particles. I then wanted to try to reduce then via air purifiers and see if it makes a difference.
I'm seeing a lot of inexpensive detectors on AliExpress, but I'm a little overwhlemd with the choices.
I also saw these on amazon:
However, they seem to be using the same sensors, so not sure what the reason for the price difference is.