Area GIS Download Page

This page provides links to shapefile downloads for designated 1997 8-hour Ozone, 1997 PM-2.5, and 2006 PM-2.5 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 a 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

In addition to the area shapefiles, external 8-hour Ozone and PM-2.5 data files in both DBF and Excel spreadsheet formats are provided in a compressed self-extracting zip file. When the file is unzipped, it will create a directory called "shape" beneath the directory where the external zip file is located. Included with the external files in the zip file is a "ExternalFileData.txt" text file that contains area attributes, and an composID value that can be linked with the same composID in the shapefile dbf.

Links to Downloadable Files

Pollutant	Area Shapefiles (compressed)	External Data Files (xls and dbf compressed)
8-Hour Ozone	Download (file size ~4.4MG)	Download (file size <10KB)
PM-2.5 (1997 Standard)	Download (file size ~365KB)	Download (file size <10KB)
PM-2.5 (2006 Standard)	Download (file size ~550KB)	Download (file size <10KB)

To save the download file, identify a directory to place the self-extracting zip file to when prompted. You will be given the choice of opening the zipped files. If your browser loads the data onto the screen instead of asking you where to save the file, go back and click with your right mouse button and select "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.

Area GIS Download Page

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