It was news to me that the lung damage from pollution isn't necessarily permanent in children, if a change in environment happens early enough. Up until reading this, I was under the impression it would be.

We had a lot of construction work in the neighborhood, our house covered in fine dust particles each day. My kid got asthma in the same period, keeps asking when she can stop taking the medicines, and I say "I don't know" thinking "probably never". But maybe now the construction work is over, there is hope? (And if construction starts again, we know that it is better to move, because there is hope.)