Los Angeles' skies are among the most foul in the United States: In the American Lung Assn.'s 2014 national State of the Air
survey, the L.A.-Long Beach area ranked worst in terms of ozone
concentrations and third worst in terms of particulates as measured by
the standard known as PM2.5, which captures particles so small they can
be seen only with an electron microscope. But if L.A. were in China, it would be cleaner than all 74 major cities
tracked in 2013 by the Chinese Ministry of Environmental Protection,
based on PM2.5 levels. Read more @ LA Times
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