In January, 2015, EPA issued a memo that will help states as they develop State Implementation Plans to address cross-state transport of air pollution for the 2008 ozone standards. This memo summarizes:  

• Proven approaches used to address transport for previous ozone standards

• Results of EPA's preliminary air quality modeling data that characterizes ozone transport.

Files and Documents

• Memo: Information on the Interstate Transport "Good Neighbor" Provision for the 2008 Ozone National Ambient Air Quality Standards under Clean Air Act Section 110(a)(2)(D)(i)(I) (PDF)(16 pp, 1 MB, 01/22/2015)
• Air Quality Modeling Technical Support Document for the 2008 Ozone NAAQS Transport Assessment (PDF)(155 pp, 4 MB, 01/26/2015)
  • Data File for the 2008 Ozone NAAQS Transport Assessment (XLS)(2 pp, 337 K)
  • Data File of 8-Hour Ozone Model Performance Statistics by Monitoring Site for the 2011 Base Year CAMx Model Simulation (XLS)(2 pp, 275 K)
  • Model Performance Statistics Definitions (DOC)(3 pp, 44 K)