The integrated science assessment (ISA) in conjunction with additional technical and policy assessments provides the scientific basis for EPA decisions in the review.

• Integrated Science Assessment for Ozone and Related Photochemical Oxidants, Final Report, February 2013
• Integrated Science Assessment for Ozone and Related Photochemical Oxidants, Third External Review Draft, June 2012
• Integrated Science Assessment for Ozone and Related Photochemical Oxidants, Second External Review Draft, September 2011
• Integrated Science Assessment for Ozone and Related Photochemical Oxidants, First External Review Draft, March 2011

You may also be interested in other documents from the current ozone NAAQS review.