35 vintage photos reveal what Los Angeles looked like before the US regulated pollution

Read the full story and view the photos at Insider.

Los Angeles has had air pollution problems since before smog was a term. In 1943, people began to notice the smog when it covered Los Angeles so thickly that residents thought Japan had launched a chemical attack. The city continued to have smog problems for decades. President Richard Nixon created the Environmental Protection Agency in 1970, which introduced air pollution regulations, and it was a major factor in combating the city’s smog problem.

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