Thus did my coauthor David Smyth remark on my pointing out the upscale housing being built on the west side of DeKalb.  It's a bit of political wisdom going back to the Steam Era, and to modern eyes, it's an incredible reason.  Path dependence is like that. "Past pollution still having an economic impact."
The east sides of New York, London and Paris are noticeably and famously poorer than their western sides. And it turns out there’s a reason for that.

Researchers have found that it’s due to the impact of air pollutants at the time of the Industrial Revolution, as prevailing winds in the U.S. and Europe typically blow from west to east. And it’s an impact that has lasted into today.
Yes, research often confirms things people think staggeringly obvious, but it's in developing the tools to be unable to reject the staggeringly obvious that one obtains the ability to make sense of the truly mysterious.

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