This assessment is intended to provide state and local agencies with information on whether their
monitoring networks still meet the monitoring objectives, whether new sites are needed, whether
existing sites are no longer needed, and whether new technologies are appropriate, as required by 40
CFR Part 58.10(d).

The assessment's recommendations are non‐binding; rather, each state/local agency wil decide, as
part of their annual network review, whether to make any of the recommended changes.
Furthermore, although there is no requirement for a periodic network assessment for tribal monitoring,
this information may also be helpful to Midwest tribes in evaluating their current and desired future
monitoring activities.

A pdf version of the 2015 final report that summarizes the analyses below and discusses other network
issues in the context of these analyses is available here:

1. Online Analysis Tool: Updated analysis tools for correlation, area and population served,
removal bias, and probability of exceeding the NAAQS for O3 and PM2.5 are now available as an
online tool: https://ebailey78.shinyapps.io/NetAssessApp/

2. Geoplatform Story Map: This web tool developed by R5 EPA displays much of the data from the analyses
below, together with additional informational layers (nonattainment area boundaries, for example) in a user‐
friendly geographic form that facilitates comparisons.

3. Correlations and Cluster Analysis

4. Measured Concentration Analysis

5. Length of Record and Number of Parameters Analysis

6. Deviation from NAAQS

7. Raw Data