The only time that I have been to that airport there was smog inside it!
Never been there ... but the country is ticking off someone it does appear or there is shoddy workmanship everywhere. At this time will vote there is shoddy workmanship everywhere.
LOL. No doubt. It’s difficult to overestimate just how bad Beijing air quality can be. I was in the elevator of the place I was staying when a embassy Marine got in. He was wearing gym clothes and I said, “You weren’t out running were you?” He looked at me and without a trace of sarcasm said, “Are you shitting me? You’d die.”