The birthplace of smog ladies and gentlemen Pittsburgh is proud of it's neighboring suburban town. Walking down the streets littered with dilapidated buildings and vacant store fronts, you may notice something ahead..what is that? Why that's the smog museum. Smog was first found in Donora. Well despite it's current ghostly atmosphere, Donora was once a thriving coal town along the Monongahela river. Smog you say?