
A sample card from the Ringelmann Smoke Chart.
Note: This is an encore post and originally appeared in 2005 on the 1947project.
Shall we talk about noir? Let’s start with the skies over Los Angeles, which are so dirty that visibility is sometimes less than a mile. And while the word “smog” has been used by the U.S. Weather Service since at least 1914, it has taken on new urgency in postwar Los Angeles, resulting in the state’s first anti-smog law, signed by Gov. Earl Warren and reported in The Times, June 11, 1947.
The Times has seldom lobbied so militantly for any measure. It has written editorials, run several multipart series by Ed Ainsworth and even imported an air pollution expert from St. Louis, Raymond R. Tucker, to analyze Los Angeles’ problems.

















