When I got this phone, it was one of the main reasons to get it, beside the roughness.
But it doesn't matter where I click or how long I wait in the app, the only measurement is CO2.

So I don't know if is my phone or the app, but in the promotional video you can see it has readings of suspended particles.

Any help about it, I will appreciate.

Hi, the sensor only measure CO2 and the quality of air

it is not very precise as an answer, what is air quality? Bad or good ?