You can look at any air quality website and source of information and see that the air quality here is utter crap.

If not IQAir, you can use Windy, WAQI, Airly (founded in Krakow, so lots of sensors here).

I am in Krakow right now and my IKEA sensor is reading 183 µg/m³ when I put it outdoors. On a good day it's normally less than 5.