“The Environmental Protection Agency significantly strengthened its national ambient air quality standards (NAAQS) for ground-level ozone, the primary component of smog. These changes will improve both public health protection and the protection of sensitive trees and plants.”

• Final Rule (312 pages, PDF)
• Fact Sheet (6 pages, PDF)
• Changes to the Air Quality Index
  • Presentation: Revise National Ambient Air Quality Standards for Ground-level Ozone
  • Text Slides (3/12/08) (17 pages, PDF)
    • Maps and Graphics (3/12/08)
    • Counties with Monitors Violating the 1997 8-Hour Ozone Standard of 0.08 parts per million (based on 2004-2006 Air Quality Data) (PDF)
    • Counties with Monitors Violating the Revised 8-Hour Ozone Standard of 0.075 parts per million (based on 2004-2006 Air Quality Data) (PDF)
    • Counties with Monitors Projected to Violate the 2008 8-Hour Ozone Standard of 0.075 parts per million in 2020 (based on air quality model projections) (PDF)
      Technical Support Documents
      • 2004 – 2006 Ozone Levels – Monitored Counties (18 pages, PDF)
        Counties Projected to Violate the 2008 Ozone Standard in 2020 Using Air Quality Model Projections (PDF)
    • CongressNow.com – EPA Smog Proposal Criticized by Lawmakers on Left, Right: “House and Senate lawmakers from both parties roundly criticized EPA’s long-awaited decision today to tighten clean air standards for ozone, or smog, with Democrats saying the new level is not protective enough and Republicans highlighting the economic costs associated with reaching the new level. EPA announced this evening it is tightening the National Ambient Air Quality Standards, or NAAQS, for ozone to 0.075 parts per million (ppm), from the existing level of 0.08 ppm.”
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