Not logged in - Login
< back

3SAQS/WAQS Monitoring Network Assessments

The WAQS MNA Wiki contains links to supplementary materials for the 2017 WAQS MNA Final Report, as well as a meeting archive for the WAQS MNA Workgroup. Materials for the 2014 3SAQS MNA are also provided in the wiki.

Note: The map based images are high resolution. After opening image files in your browser, click on an area of interest to view at higher resolution.

3SAQS 2014

3SAQS Monitoring Network Assessment Technical Memo (9 June, 2014)
3SAQS Network Recommendations (27 Feb., 2014)
Document Archive
Cost Survey

WAQS 2017

Final Report

WAQS Monitoring Network Assessment Final Report (3 Nov., 2017)


WAQS Monitoring Network Assessment Working Group Meetings
WAQS Governing Board 2017.05.05.pptx (5 May, 2017)
WAQS OC 2017.11.06.pptx (6 Nov., 2017)

Monitoring Sites

Tabular Data

Monitors (monitors in the WAQS region. Data were obtained from AQS Monitor Listing file, 26 May, 2017 AQS update1)


By Monitored Parameters (Parameters cconsidered in the WAQS MNA)
All monitors non-overlapping labels
All monitors overlapping labels
O3 and Precursors O3, NO2, VOCs (with ethane and formaldehyde)
inclues FRM/FEM and non-FRM/FEM PM2.5 monitors
PM2.5 Raw and Total
AQS codes 88500 and 88501 (potentially useful for WAQS MPE)
Ions and Ammonia
Sulfate and Nitrate ion, and AMoM NH3
Wind speed and Temperature
NADP sites
AMoN and NTN

By Agency and/or Organization
Colorado-DPHE (N/A)
Wyoming-DEQ (N/A)
Utah-DEQ (N/A)
Montana-DEQ (N/A)
Dakotas (N/A)
Other (N/A)

Current Conditions

4th Highest Maximum Daily 8-hour average (MD8). Calculated in the WAQS MNA using EPA's 8-hour average data (2016-12-23 update)
2010 2011 2012 2013 2014 2015

2013-2015 County Level DVs2 (overlaid with Site Level 2015 O3MD8s from WAQS MNA)
O3 MD8
O3 MD8 zoom to show counties with monitor(s) > 70ppb

2014-2016 County Level DVs3 (overlaid with with monitor locations)34
O3 MD8
O3 MD8 zoom to show counties with monitor(s) > 70ppb
NO2 1-hour
NO2 annual
PM2.5 24-hour
[PM2.5 24-hour] with CIA overlay
PM2.5 annual
PM2.5 24-hour NAAs WAQS Region
PM2.5 24-hour NAAs zoom to Wasatch Front, includes NO3 and NH4 monitors (should update with AMoN, specifically)

Monitor-to-Monitor Analysis


Locations of highly correlated monitors, as defined in the MNA Report.45

Locations of the top 10 most highly correlated for O3, NO2 and PM2.5
Top 10
Top 10 zoom of Denver Metro Area

Tabular data

Excel spreadsheet with summary data from the correlation analysis.
Monitor Correlations

Plot Archive

Plots Regression Analysis - Scatter plots and time series for O3MD8s and daily O3, NO2 and PM2.5

Plots Correlograms for O3, NO2 and PM2.5 monitors

Representative Area

Gap Analysis

Maps showing monitor locations, O&G wells, population centers. PM2.5 maps show Class I Areas.

O3 NO2 O3&NO2 PM2.5 (O3 and NO2 maps include well locations for 'approved and pending' permits)

O3 NO2 O3&NO2 PM2.5

O3 NO2 O3&NO2 PM2.5

New Mexico
O3 NO2 O3&NO2 PM2.5

O3 NO2 O3&NO2 PM2.5

North and South Dakota
O3 NO2 O3&NO2 PM2.5

Emissions Analysis

WAQS 2011b v2 O&G Sector Emissions
VOCs Emissions Wells Monitor Rankings
NMHC Emissions Wells Monitor Rnkings
NOx Emissions Wells Monitor Rankings
FP Emissions Wells Monitor Rankings

1. EPA 2017a, AQS Pre-generated data files,

2. EPA 2017b, Map Service: USEPA Office of Environmental Information (OEI). Data: U.S. EPA Office of Air and Radiation (OAR) - Office of Air Quality, downloaded on Oct. 11, 2017

3. 2014-2016 Design Value maps are overlaid with active monitoring locations, rather than site level MD8s, because data for 2016 O3 MD8s were not available at the time this analysis.

4. EPA 2017b.

5. Highly correlated monitors are defined in the MNA as being correlated with another monitor with a regression coiefficient (R2) >0.8 and average concentration within 10%. The average concentration criteria was set to 15% for NO2. Regressions use all available matching (that is, days where both monitor report data) 24-hour average data.