[eveningcoffee]

* Your chimney's exhaust is just another person's air when it's as concentrated as you'd find in places like those described in the article.*

This is true but does not change anything as even now the exhaust would get out of the building, just more inefficiently. It is staying likely closer to the ground for longer too.

Of course for long term solution a concentrated and well filtered power plant with an accessible grid would be a best solution. But even then an exhaust hood above the cooking place is needed.