On March 11, a study, entitled “Reconciling NOx Emissions Reductions and Ozone Trends in the U.S., 2002-2006,” revealed that ozone levels in eastern part of the U.S. had fallen more quickly that an Environmental Protection Agency (EPA) air pollution computer model had predicted. EPA’s Community Multiscale Air Quality model had predicted ozone levels would drop by 4.6 parts per billion (ppb), but the study says those levels actually dropped 8 ppb between 2002-2006.