People concern for "air quality" lately has me wondering how in the world humanity survived to this point, in utter ignorance of the horrid damage everything they could smell was doing to them. Perhaps we should be encased in sterile bubbles at birth, with all inputs filtered for purity and consistency. Surely that would be the best way to avoid all the dire consequences of the pollutants surrounding us.
Also understanding of problems caused by this and availability of alternatives increased.
We can see how life expectancy improved in areas where pollution was reduced.
In the end you could mind the survivorship bias. Sure, people survived through the past, but many had earlier death due to pollution.