Retraction: Maternal Exposure to Particulate Matter Increases Postnatal Ozone-induced Airway Hyperreactivity in Juvenile Mice

The authors of an article published in 2009 (1) have informed the Journal that, as a result of an institutional inquiry, they had reexamined the raw data used in their article and determined that the results reported in Figures 2, 4, and 5 were unreliable. They were unable to repeat the studies reported in Figures 2 and 4 due to lack of materials. Therefore, the authors have requested that the paper be retracted. The authors apologize to the Journal and to its readers.