Explore historic Pittsburgh through rare photos showing its residents under coal smoke. #PittsburghHistory #CoalSmoke #VintagePhotos #1940s #1950s #IndustrialEra #AirPollution #EnvironmentalHistory #UrbanLife #SmokeChoked #BygoneEra #HistoricalPhotography #Nostalgia #IndustrialRevolution #Documentary #BlackAndWhitePhotos #HistoryChannel #SteelCity #PastLives #Smoke #Coal #Industry #UrbanDecay #Heritage #Memory #RememberWhen #ThrowbackThursday #OldPittsburgh #ForgottenCities #AmericanHistory #SmokeStacks