Laura asks an excellent question:
"This also begs the question does remaining in a highly polluted area affect our progression once we have full blown PD? "

In the case of PD (low recovery rates, at best, and almost a steady state)
average life expectancy from diagnosis is approximately prevalence divided by incidence.

It's not easy to work with, but we have the data in the two maps. It's a pity that we don't have the raw data.

John