RESOURCE Eight-Hour Ozone Plan for the Maricopa Nonattainment Area On June 15, 2004, the EPA designated a 4,880 square mile area located mainly in Maricopa and Pinal Counties as an eight-hour ozone nonattainment area. An eight-hour ozone plan for the Maricopa Nonattainment Area was submitted to the EPA by the June 15, 2007 deadline. The plan demonstrates that the eight-hour ozone standard will be met by the ozone season of 2008, with measures that have been implemented before the ozone season of 2008. The plan uses photochemical modeling to show that the standard will be attained in 2008 with federal, state, and local control measures that have already been implemented in the region. The modeling results are supported by a downward trend in monitored ozone concentrations. As Figure ES-1 indicates, the eight-hour ozone standard has not been violated at any monitor in the Maricopa nonattainment area for the past two years (i.e., 2005 and 2006). NOTE: Because these are extremely large files, and as an additional security measure, right click and choose "Save Target As..." to save to disk. Eight-Hour Ozone Plan (PDF, 4.7 MB) Appendices, Volume 1 (PDF, 35.0 MB) Appendices, Volume 2 (PDF, 78.2 MB)