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Correction published 1/6/2009: Health: In its most recent ratings last year, the American Lung Association named the Pittsburgh metropolitan area worst in the nation for the most days of unhealthful particle pollution levels, and second only to Los Angeles for annual air pollution. An article published Jan. 2, 2009 announcing the appointment of a new asthma researcher at Children's Hospital of Pittsburgh of UPMC referred to Pittsburgh's ranking in 2004.

Correction published 1/4/2009: Opinion: The Enough Said feature published Dec. 28, 2008 listed an incorrect figure for the number of U.S. military fatalities in Iraq since the war began in March 2003. As of Jan. 1, 2009, at least 4,221 U.S. soldiers or Marines had been killed in Iraq.