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3SAQS/WAQS Monitoring Network Assessments

This Wiki page contains materials for Monitoring Network Assessments conducted by the 3SAQS and WAQS. The 2014 3SAQS Assessment evaluated the status of ambient air quality monitors in Colorado, Wyoming and Utah. The 2017 WAQS study expanded the geographical region of the Three State Study to seven states by adding New Mexico, Montana, North Dakota and South Dakota. Final reports, supplemental materials, and meeting archives for the 2014 3SAQS and 2017 WAQS MNA are available below.


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 An Excel Workbook that lists monitors in the WAQS region. The Workbook has tabs for all monitors in the WAQS region, and monitors by agency and/or organization. Information in the workbook was obtained from the AQS Monitor Listing file, 2017-05-26 AQS update1


Note The map based image files are high resolution and can be viewed at full resolution in most web browsers by clicking on a specific region of the map after it has downloaded to your browser window.

By Parameter Maps showing monitors for the parameters considered in the WAQS MNA
All monitors non-overlapping labels
All monitors overlapping labels
O3 and Precursors O3, NO2, VOCs (highlighting monitors that report ethane and formaldehyde)
PM2.5 inclues FRM/FEM and non-FRM/FEM PM2.5 monitors
PM2.5 with supplemental monitoring PM2.5 monitors that also measure PM2.5 Raw and PM2.5 Total
Ions and Ammonia PM2.5 Sulfate and Nitrate and NH3 from AMoN
Meteorology Wind speed and Temperature
NADP sites AMoN and NTN

By Agency and/or Organization Maps showing monitors affiliated with organizations considered in the WAQS MNA
New Mexico, Albuquerque DEQ
Other (N/A)

Current Conditions

O3 MD8s

4th Highest Maximum Daily 8-hour average (MD8). Calculated in the WAQS MNA using EPA's 8-hour average data (2016-12-23 AQS update2)
2010 2011 2012 2013 2014 2015

Design Values

2013-2015 County Level DVs3 (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 DVs4 (overlaid with with monitor locations)5
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.6

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

Additional Resources

State Agency 5-year Monitoring Network Assessments and/or recent State/Local Agency Network Plans

Colorado - CDPHE 2015 MNA 2017 Network Plan

Wyoming - WDEQ 2015 MNA 2016 Network Plan

Utah - UDEQ 2015 MNA 2016 Network Plan

New Mexico - NMED 2015 MNA 2017 Network Review Albuquerque 2017 Network Plan

SDDEP 2015 MNA 2017 Network Plan

NDDEQ 2017 Network Plan

MTDEQ 2016 Network Plan

O&G Well Locations

Colorado - COGCC GIS downloads see Well Surface Location Data
Layers: Wells.shp, Permist.shp, Permits_pending.shp; Filters: Facil_stat = Producing; Downloaded 2017-4-11

Montana & Dakotas - USGS Energy Developmet - GIS Data
Layer: PetroleumWells_041113; Filters: Producing (MD, ND, SD), not DRY (ND); Published: 2013-11-19; Downloaded 2016-10-24

New Mexico - NMOCD
Layer: NM_Wells_State_Wide_UTM_NAD_83_Z13; Filters: Status=Active, Well Type = Gas, Oil, Injection, Gas Storage; Downloaded 2016-10-25

Utah - DOGM GIS Data ftp
Layers: DNROilGasWells; Filters: Status = Producing, Active, Well Type = Oil well, Gas well, Gas injection, Gas storage; Downloaded 2017-4-11

Wyoming - WDEQ (Cara Keslar, personal communication)
Layers: wogcc_wells; Filters: WellStatus = Permit to Drill, Producing Gas Well, Producing Oil Well; Received 2017-4-7

GIS Data

Arc GIS mdx files, scripts and geodatabases used for the 2017 WAQS MNA pending

Design Values
Correlation Analysis
Gap Analysis
Emissions Analysis

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

2. ibid.

3. 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

4. 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 of this analysis.

5. EPA 2017b.

6. 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.