alt Hacker NewsFunnily enough, Kraków region has the longest live expectancy in Poland (see https://stat.gov.pl/en/topics/population/life-expectancy/lif...).
Which is interesting, as either air quality does not matter that much or those data are just bogus.
Well, air quality matters probably, so we are left with the data. Let's check what is the origin of this information: https://www.iqair.com/poland/lesser-poland-voivodeship/krako...
6 stations. One from "corporate contributor" named Arek (common Polish first name, short from Arkadiusz so does not look like a big corp) plus 5 other individual contributors.
What equipment those 6 stations have? No idea. Are the instruments calibrated properly? No idea. Are they placed in the right spot, not on the balcony near the chimney? No idea. Are they placed evenly across Krakow to give reliable city-wide data? Looking on the provided locations - not really.
Iqair seems to "crowdsource" their measurements so they get "crowdsourced" data, which can be total crap. Do they even verify those data? How? No idea.
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.