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The designation process has included the development of GIS shapefiles during the designation process for nonattainment areas since 2004. The first NAAQS that the nonattainment areas were designated using shapefiles were the 1997 8-hour ozone areas. Table 1 provides links to the GIS shapefiles developed since 2004.

Table 2 provides the links to shapefiles that were developed outside of the nonattainment designation process. For these pre-2004 nonattainment area designations, the boundaries in the shapefiles were developed outside of the designation process based on the Part 81 table description. Some issues where identified when translating the Part 81 boundary descriptions as shapes. The area description in the Part 81 table is the nonattainment area boundary of record for issues in the pre-2004 designated areas. The Part 81 area descriptions can be found in the Green Book "Area/State/County" reports for each NAAQS.

Both sets of shapefiles include boundary information for all of the designated areas. External files are provided that contain the current nonattainment/maintenance status and classification for designated areas. The shapefiles can be downloaded to a directory or disk by clicking on the links below.

Each shapefile is composed of multiple files and has been compressed into a self-extracting zip file. Each zipped file contains the following individual files, which must all be saved to be properly used by mapping software:
  • shapefile.dbf: feature attributes
  • shapefile.prj: projection file
  • shapefile.sbn: spatial index of features
  • shapefile.sbx: spatial index of features
  • shapefile.shp: feature geometry
  • shapefile.shp.xml: metadata in XML format
  • shapefile.shx: shape index of the feature geometry
Additional information about the designated areas is available in the external data files in both xbase (dbf) and spreadsheet (xls) formats. These data files are provided in a compressed self-extracting zip file along with the file "ExternalFileData.txt" which lists the area attributes in the external data files. The external data files can be linked to the shapefiles through the composID field in each file.
 
Note:

The compressed area shapefiles listed below contain the boundary shapes for all of the areas that were designated nonattainment for a standard revision. The external data files contain the current area status information, indicating the reclassification and whether an area is nonattainment or has been redesignated to maintenance at the time of the Green Book posting. The external data files can be linked to the shapefiles through the composID field in each file.

As of the July 2, 2014 Green Book, the exported pollutant name has been modified to include the year of the NAAQS standard or revision.

 
Links to Downloadable Files
Table 1: Shapefiles developed as part of the Nonattainment Area Designation process

Pollutant Last Shapefile Update
(updates made to add or adjust area boundaries)
Shapefile Containing All Designated Nonattainment Areas
(compressed)
External Data Files with Current Area Status *
(xls and dbf compressed <10 KB)
8-Hour Ozone (2008 Standard) 06/05/2012 Download
(file size ~8.5 MG)
Download
8-Hour Ozone (1997 Standard) 11/04/2013 Download
(file size ~4.5 MG)
Download
PM-2.5 (1997 Standard) 06/18/2009 Download
(file size ~400 KB)
Download
PM-2.5 (2006 Standard) 08/24/2011 Download
(file size ~600 KB)
Download
Lead (2008 Standard) 01/20/2012 Download
(file size ~100 KB)
Download
Sulfur Dioxide (2010 Standard) 11/12/2013 Download
(file size ~250 KB)
Download

* External Data Files contain the nonattainment/maintenance status and classification at the time of the Green Book's posting and can be linked to the shapefiles through the composID field in each file. Multi-state nonattainment areas are not considered maintenance areas until all states in the area have been redesignated.

 
Table 2: Shapefiles developed from Part 81 table descriptions

Pollutant Last Shapefile Update
(updates made to add or adjust area boundaries)
Shapefile Containing All Designated Nonattainment Areas
(compressed)
External Data Files with Current Area Status *
(xls and dbf compressed <10 KB)
1-Hour Ozone (1979 Standard-revoked 6/15/2005)
Classified areas only
11/04/2013 Download
(file size ~11 MG)
Download
Carbon Monoxide (1971 Standard) 11/04/2013 Download
(file size ~1.3 MG)
Download
Nitrogen Dioxide (1971 Standard) 11/04/2013 Download
(file size ~100 KB)
Download
Sulfur Dioxide (1971 Standard) 11/05/2013 Download
(file size ~300 KB)
Download
PM-10 (1987 Standard) 11/05/2013 Download
(file size ~1 MB)
Download
Lead (1978 Standard) 11/04/2013 Download
(file size ~50 KB)
Download
* External Data Files contain the nonattainment/maintenance status and classification at the time of the Green Book's posting and can be linked to the shapefiles through the composID field in each file. Multi-state nonattainment areas are not considered maintenance areas until all states in the area have been redesignated.
 
To save the download file, click on the link. You will be given the choice of opening or saving the zipped files. Identify a directory for the zip file when prompted. If your browser loads the data onto the screen instead of asking you where to save the file, hit the back button, click on the file with your right mouse button, and select the save option (e.g., "Save Link As" in Firefox or "Save Target As" in Internet Explorer).
 
Each shapefile was created using ESRI's GIS mapping software and can be used by geospatial mapping applications that support the ESRI shapefile format. ArcView, ArcGIS, and ArcExplorer (ArcExplorer is free from ESRI) can be used to view the shapefiles. Commercial and free third party software is available that can be used to view shapefiles.
 
Disclaimer
 
Although these data have been processed successfully on a computer system at the Environmental Protection Agency, no warranty expressed or implied is made regarding the accuracy or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. It is strongly recommended that careful attention be paid to the contents of the metadata file associated with these data to evaluate data set limitations, restrictions or intended use. The U.S. Environmental Protection Agency shall not be held liable for improper or incorrect use of the data described and/or contained herein.

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