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Ozone Modeling



To aid in evaluating the impact of emissions control strategies as well as developing Attainment Demonstrations as part of State Implementation Plan (SIP) requirements, the RAQC also engages in photochemical modeling efforts. Photochemical modeling is a grid based computer model used to simulate air pollution episodes. It is the most effective tool for determining how serious air pollution problems are and how they occur. Photochemical modeling allows for the assessment of:

    • How sensitive pollutants are to varying parameters such as meteorological conditions and emission rates
    • How sensitive pollutants are to control scenarios
    • Efficacy of proposed control strategies

Photochemcial modeling is completed using EPA approved modeling platforms and methodologies. A detailed modeling protocol is developed which outlines the technical details of the modeling being performed. The protocol documents the approach, procedures, participants and other requirements need to conduct photochemical grid model modeling.


Final Reports and Presentations

Modeling Protocol for 2008 and 2015 Ozone Standards  (Ramboll – April 2019)

NOx/VOC Sensitivity Analysis (Ramboll/Alpine Geophysics – March 2018)

Source Apportionment Modeling Report (Ramboll – April 2017)

2017 Photochemical Grid Modeling – Model Performance Evaluation (Ramboll – September 2017)

2017 Photochemical Grid Modeling – Attainment Demonstration (Ramboll – September 2016)

Source Apportionment Modeling Analysis for the Denver Early Action Ozone Compact (Environ/Alpine Geophysics, May 2004)


Modeling Forums

November 2, 2017 Forum

August 9, 2012 Forum



Modeling Guidance – Final (Nov. 2018) 


Request for Proposals

2018 Request for Proposal – deadline July 10, 2019

2011 Request for Proposal (RFP)