Vintage photos taken by the EPA reveal what American cities looked like before pollution was regulated [Video]

Don’t let the soft, sepia tones fool you — the United States used to be dangerously polluted.

Before President Richard Nixon created the Environmental Protection Agency in 1970, the environment and its well-being was not a federal priority.

In the early 1970s, the EPA launched the “The Documerica Project,” which leveraged 100 freelance photographers to document what the US looked like. By 1974, they had taken 81,000 photos. The National Archives digitized nearly 16,000 and made them available online.

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.

This Earth Day, we’ve selected 35 of the photos to reflect on how cities across the US have changed — 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, …