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The Western Air Quality Study (WAQS) performed photochemical grid modeling for the year 2011 using the Comprehensive Air Quality Model with Extensions (CAMx) version 6.10 and the Community Multiscale Air Quality (CMAQ) model version 5.0.2. The WAQS 2011 base year simulation version b (WAQS_Base11b) was derived from the Three State Air Quality Study 2011 version A modeling platform (3SAQS_Base11a). The WAQS_2011b simulation includes series of updates and improvements to the input data and model configurations used for the 3SAQS_Base11a.

The WAQS_Base11b base case model performance was evaluated against concurrent measured ambient concentrations using graphical displays of model performance and statistical model performance measures. The CAMx and CMAQ performance were compared against established model performance goals and criteria, following the procedures recommended in EPA’s photochemical modeling guidance documents. The evaluation included sub-regional evaluations for Colorado, Utah, Wyoming, and New Mexico; and evaluations by month and season.

Modeling Performance Evaluation Report (Jan 2016)


Model performance evaluation plots for simulation Base11b are available from the Intermountain West Data Warehouse (IWDW)

WAQS_Base11b Change Log

Summary of the changes in the WAQS_Base11b relative to 3SAQS_Base11a.



Chemistry-Transport Model