This 1950s historical photograph was provided by the Center for Disease Control's (CDC), National Institute for Occupational Safety and Health (NIOSH). The image showed an extreme air pollution event due to Salt Lake City, Utah smog, which occurred on November 11, 1950, and was made as part of a U.S. Public Health Service (USPHS) study. Air pollution can be a major cause of a variety of respiratory illnesses.
CDC/ Barbara Jenkins, NIOSH
September 29, 2012
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