perhaps you should have a look at this.
Perhaps you should take into account the type of pollution and the real damage that the worst types can cause, more complicated than the white shirt test .
Britain, France, Germany, Hungary, Italy, and Romania are being taken to court for not controlling the most harmful emission types. Poland is not on the list.
Looking at the map, Delph's neck of the woods looks very very clean compared to Kraków.
I'm sure delph is happy in his part of the world, long may he continue to enjoy white shirts.