DK GreenRoots - How Regulation came to be: Donora About twenty-five miles upriver of Pittsburgh, Pennsylvania, the Monongahela River makes a sweeping horseshoe bend. Nestled in the horseshoe on the west bank or the river is the town of Donora, ...

Some terrain is especially problematic for air pollution. 12th in series, reposted w/permission. #HowRegulationCameToBe #Donora #Inversion #SulfurDiOxide #KillerSmog #Smog #AirQuality #Pennsylvania