It does't not worth the money to live in Beijing, no matter how rich you can get there, and you can get rich there, but it simply does not worth.
Your life is more important, specially if you have kids.
But I am happy to know that Poland's air still can breath, at least, compared to India or China.
I have been in Szczecin city once, and I love Poland, and I specially love the Polish people.
Wish all good for you guys over there, and that the air gets better in the future, we need to hope.
It does't not worth the money to live in Beijing, no matter how rich you can get there, and you can get rich there, but it simply does not worth.
Your life is more important, specially if you have kids.