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Figure 6.21.
Brilliant sunset through elevated pollution layer over Los Angeles, California, in May 1972. Gene
Daniels, U.S. EPA, May 1972, Still Pictures Branch, U.S. National Archives.
Figure 6.22.
Elevated pollution layer formed over Long Beach, California, on July 22, 2000, by a sea breeze
circulation. Photo by Mark Z. Jacobson.
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