Weak citizens dying of air pollution quickly and being replaced by healthy strong new recruits from the hundreds of millions living in the China villages.
Very similar the recipe for big cities in Europe before the industrial revolution. There was no canalization, food had to be brought on horse cars without refrigerators from vast areas, making it decay. A dozen people per room, resulting in fast spreading of viruses and bacteria.
How polluted are the rest of the big cities in England, e.g. Manchester?
20 years seems way too much, I doubt people in a clean country get to die e.g. in the their 90s on average, while Londoners perish in their 70s.
I saw an EU study a few months ago claiming the most polluted monitored place in the 28 EU states is the town of Pernik in Bulgaria and Sofia is the most polluted capital ( it's in Bulgaria as well).
Very similar the recipe for big cities in Europe before the industrial revolution. There was no canalization, food had to be brought on horse cars without refrigerators from vast areas, making it decay. A dozen people per room, resulting in fast spreading of viruses and bacteria.