US counties reporting good air quality days

As more US counties have reported good air quality days, more young adults have been living with their parents, a correlation of 0.977 that suggests either that clean air makes children reluctant to leave home or that the same economic forces cleaning the atmosphere are also preventing a generation from affording rent. The air clears, the childhood bedroom remains occupied, and the chart connects environmental progress to residential regression with the domestic precision of a coefficient that has never moved out.

Both spiked in 2020. Lockdowns cleared skies over much of the country as traffic and industry idled, while a historic wave of young adults moved back in with their parents after losing jobs, college housing, and urban leases. Two different ways covid rearranged where people were breathing.

Twenty-one years of cleaner air and more boomerang kids is a correlation between two measures of the same economy: one where things are getting better (air quality) and one where things are getting worse (housing affordability). The air improves, the bedroom is still occupied, and the chart captures both realities of a nation that has solved some problems and created others.