Landed, smelled and tasted the air, stayed for 2 days and vowed never to return until such time air quality is fit for humans. And the only reason I stayed for the second day was that I couldn't rebook my flight to an earlier departure.
So if you value your health at all, yes, it's probably better to find another place to live.
I took that decision over fifteen years ago. The health of my kids took priority over numbers in the bank.
The western world has exported its pollution to the Far East. The local government has allowed it.