Document Archives Reports

4th Maximum Ozone Values Table (ppb) through September 30th, 2016

Posted Under: News Room - News, Ozone (8-Hour Standard)

Click here to view current table

The Denver Metro/North Front Range area is designated as nonattainment by the U.S. Environmental Protection Agency (EPA) for the pollutant ozone. The 2008 8-Hour Ozone Standard is 75 parts per billion (ppb) and is calculated using a rolling three-year average of the fourth (4th) highest daily 8-hour ozone concentration.

The table linked above shows current monitoring data for the nonattainment area, including the top four (4) values for each monitoring site for the current ozone season as well as the 4th highest values for the previous two years. The 4th highest values over a three-year period are averaged to determine the Design Value (DV) at each monitor. The highest DV is the test of attainment, with all monitors having to be at or below the standard.

The RAQC’s ozone education campaign, OzoneAware, issues Ozone Action Alerts as well as notices about upcoming community events. The public is encouraged to participate in efforts to reduce air pollution by joining the Clean Air Community and using the OzoMeter to track air quality impacts.

For additional information on ground-level ozone, please visit or call (303) 629-5450, ext. 220.

Click here to view previous tables

Attainment Demonstration Modeling for the Denver Metro/North Front Range 2017 8-Hour Ozone State Implementation Plan (SIP) – Draft Modeling Protocol

Posted Under: Modeling, News Room - News


The RAQC is in the process of conducting modeling needed to demonstrate attainment of the current March 2008 ozone National Ambient Air Quality Standard (NAAQS) in Denver Metro/North Front Range region by 2017.  This Modeling Protocol guides the technical details of a modeling study and provides a formal framework within which the scientific assumptions, operational details, commitments and expectations of the various participants can be set forth explicitly and means for resolution of potential differences of technical and policy opinion can be worked out openly and within prescribed time and budget constraints.  Current modeling is being carried out by a contracting team consisting of Ramboll Environ US Corporation and Alpine Geophysics, LLC under contract to the Regional Air Quality Council (RAQC).

Click here to access.

Archived Weekly 8-hour Ozone Summary Reports

Posted Under: News Room - News, Ozone (8-Hour Standard)



Report through September 25th, 2016
Report through September 5th, 2016
Report through August 21st, 2016
Report through August 14th, 2016
Report through August 7th, 2016
Report through July 31st, 2016
Report through July 24th, 2016
Report through July 17th, 2016
Report through July 11th, 2016
Report through July 4th, 2016
Report through June 26th, 2016
Report through June 19th, 2016
Report through June 12th, 2016
Report through June 7th, 2016


Report through October 21st, 2015
Report through October 4th, 2015
Report through September 27th, 2015
Report through September 20th, 2015
Report through September 14th, 2015
Report through September 7th, 2015
Report through August 30th, 2015
Report through August 23rd, 2015
Report through August 16th, 2015
Report through August 8th, 2015
Report through August 2nd, 2015
Report through July 26th, 2015
Report through July 19th, 2015
Report through July 12th, 2015
Report through July 5th, 2015
Report through June 28th, 2015
Report through June 22nd, 2015
Report through June 7th, 2015


Report through October 15th, 2014
Report through August 24th, 2014