Many of the photos were taken before water and air pollution were fully regulated. The Clean Air Act was passed in 1970, and the Clean Water Act was passed in 1972.
Baltimore, Birmingham, Cleveland, Delaware, Denver, Kansas, Los Angeles, New Orleans, New Jersey, New York, Philadelphia, Pittsburgh, and San Francisco all feature here, in shots filled with smoke, smog, acid, oil, rubbish, and sewage.
None of the 35 photos are pretty (other than the film-photo haze), but it’s worth remembering what US cities used to be like before we cared what we put into the air, soil, and water.
Via Business Insider