Ozone Designations - 2015 Standards - Colorado State Recommendations and EPA Response

Ozone Designations for the 2015 Standards - Colorado

Scroll to the bottom for most recent documents. 

• Colorado State Recommendation (pdf) (24.73 MB)
• Colorado State Recommendation - Technical Support Document (pdf) (7.36 MB)
• EPA's Response to Colorado (pdf) (55.57 KB)
• EPA's Technical Support Document (TSD) (pdf) (1.69 MB)
• Final EPA Technical Support Document (Colorado) (pdf) (2.25 MB)
• May 2021 - EPA's Response to Colorado (pdf) (872.6 KB)
• May 2021 - Denver Metro/North Front Range: Nonattainment Area Intended Area Designations for the 2015 Ozone National Ambient Air Quality Standards Technical Support Document (TSD) for Counties Remanded to EPA (pdf) (3.86 MB)