Document Archives Reports

VOC/NOx Sensitivity Analysis

Posted Under: Modeling, Modeling, Modeling & Emissions Inventories, Ozone

 

In 2017, Ramboll Environ performed sensitivity analyses to estimate the effects that VOC and/or NOx emission reductions have on 2023 ozone design values in the Denver Metro/North Front Range nonattainment area.  A summary of this analysis was presented at the RAQC’s Modeling Forum on November 2, 2017, which can be found here.  An analysis tool was also developed as part of this effort, which allows users to view projected ozone design values for each monitoring site based on various levels of NOx and VOC reductions.

VOC/NOx Sensitivity Analysis Tool

4th Maximum Ozone Values Table (ppb) through September 30th, 2017

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, Simple Steps. Better Air., 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 SimpleStepsBetterAir.org or call (303) 629-5450, ext. 220.

Click here to view previous tables

Archived Weekly 8-hour Ozone Summary Reports

Posted Under: Ozone (8-Hour Standard)

 

2017

Report through September 24, 2017
Report through September 17, 2017
Report through September 10, 2017
Report through August 27th, 2017
Report through August 20th, 2017
Report through August 13,2017
Report through August 6, 2017
Report through July 16th, 2017
Report through July 9th, 2017
Report through June 28th, 2017
Report through June 25th, 2017
Report through June 19th, 2017
Report through June 11th, 2017
Report through May 22nd, 2017

2016

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

2015

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

2014

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

Low-VOC Consumer Products and AIM Coatings Market Survey

Posted Under: Ozone (8-Hour Standard)

Low-volatile organic compounds (VOC) Consumer Products and Architectural and Industrial Maintenance (AIM) Coatings Market Survey Final Report

Prepared by: SC&A Incorporated, August 2017

2017 Source Apportionment Modeling Report Available

Posted Under: Modeling, Modeling, Modeling & Emissions Inventories, News Room - News, Ozone

 

As part of future ozone planning for the Denver Metro/North Front Range (DM/NFR) nonattainment area, the Regional Air Quality Council (RAQC) and Air Pollution Control Division (APCD) recently completed a report on ozone source apportionment modeling for the 2017 emissions year using the 2011 modeling database developed for the Moderate Area Ozone State Implementation Plan (SIP).  The report detailing this modeling effort is now available on the RAQC website (Denver/North Front Range Local Source 2017 Source Apportionment Modeling Using a 2011 Modeling Database).

In addition to the report, modeling results have been loaded into a Source Apportionment Visualization Tool (SA Vis Tool) that can be accessed through the Intermountain West Data Warehouse (IWDW).  Through this tool, users can isolate individuals monitors to see the source contributions on individual days and averaged over multiple days.

Beyond this modeling effort, the RAQC and APCD are also in the process of conducting sensitivity modeling that includes evaluation of:

  • 2023 future year modeling based on on-the-books reductions
  • Impact of both intrastate emissions controls outside Colorado and contributions of international emissions
  • Impact of broad Nitrogen Oxides (NOx) and/or Volatile Organic Compound (VOC) reductions at monitors in the DM/NFR nonattainment area

Upon completion of these sensitivity runs, the RAQC and APCD will be hosting a modeling forum to present results and discuss how the analyses play into future ozone planning efforts.

Please feel free to contact Amanda Brimmer, RAQC,  with any questions or comments.

Denver/North Front Range Local Source 2017 Source Apportionment Modeling Using a 2011 Modeling Database

Posted Under: Modeling

Denver/North Front Range Local Source 2017 Source Apportionment Modeling Using a 2011 Modeling Database

Prepared by: Ramboll Environ and Alpine Geophysics, April 2017

Review: Low-VOC Consumer Products and AIM Coatings

Posted Under: Ozone (8-Hour Standard)

Review: Low-VOC Consumer Products and AIM Coatings

Prepared by: Regional Air Quality Council, June 30, 2016

Review: Non Gasoline Powered Commercial Lawn and Garden Equipment

Posted Under: Ozone (8-Hour Standard)

Review: Non Gasoline Powered Commercial Lawn and Garden Equipment

Prepared by: Regional Air Quality Council, June 30, 2016

Moderate Area 2008 8-Hour Ozone Standard State Implementation Plan

Posted Under: Ozone (8-Hour Standard), SIP

 

Technical Support Documents for the Moderate Area 2008 8-Hour Ozone Standard State Implementation Plan

Posted Under: Ozone (8-Hour Standard), SIP

Technical Support Documents Supporting the Denver Metro/North Front Range Moderate Area 2008 8-Hour Ozone Standard State Implementation Plan

Emissions Inventory Development

Photochemical Grid Modeling

Weight of Evidence (WOE) Analyses

Other

 

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