EJSCREEN User Guide 

4-14-2015

Environmental Protection Agency

EJSCREEN User Guide

2015
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Table of Contents

Section Page

A. EPA EJSCREEN Web Application...................................................................................3

B. EJSCREEN Web Application Home Screen ....................................................................4

C. Exploring and Navigating Maps .......................................................................................4

1. Basemaps .......................................................................................................................... 4

2. Navigation .......................................................................................................................... 5

2.1 Zoom In/Out.................................................................................................................. 5

2.2 Pan ............................................................................................................................... 6

3. Overview Map and Scale Bar ............................................................................................. 6

D. Using EJSCREEN Widgets for Analysis ..........................................................................7

1. Bookmarks Widget ............................................................................................................. 7

1.1 Bookmarks List ............................................................................................................. 7

1.2 Adding and Deleting Bookmarks ................................................................................... 8

2. Find an Address or Place Widget ....................................................................................... 9

2.1 Find an Address............................................................................................................ 9

2.2 Coordinates.............................................................................................................. 9

3. Report on Selected Place Widget......................................................................................10

3.1 Locate an Address .......................................................................................................11

3.2 Buffer ...........................................................................................................................12

3.3 Explore Reports ...........................................................................................................14

3.4 Chart of Data Comparisons..........................................................................................14

3.5 Tabular View................................................................................................................16

3.6 Get Printable Standard Report .....................................................................................18

3.7 Get 2008-2012 ACS Report, 2010 Census Report or 2000 Census Report.............23

4. Erase Widget.....................................................................................................................25

5. Map Data Widget...............................................................................................................25

5.1 Map EJSCREEN Indexes.............................................................................................26

5.2 Map Supplementary Demographics .............................................................................30

5.3 Map Supplementary Layers .........................................................................................31

5.4 Search Available Data..................................................................................................38
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5.5 Add layer from the Web ...............................................................................................41

6. Measure Widget ................................................................................................................42

6.1 Measure Area ..............................................................................................................42

6.2 Measure Line ..............................................................................................................44

6.3 Latitude Longitude for a point.......................................................................................46
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A. EPA EJSCREEN Web Application 

This document provides an introduction to EJSCREEN and walks through how to start using the 

tool. The EJSCREEN website and EJSCREEN Technical Documentation provide many more 

details on the data and methods behind the tool.

EJSCREEN is an environmental justice mapping and screening tool that provides EPA with a 

nationally consistent dataset and approach that combines environmental and demographic 

indicators in maps and reports. This can help to highlight geographic areas and the extent to 

which they may be candidates for further review, including additional consideration, analysis or 

outreach. The tools also allow users to explore locations at a detailed geographic level, across 

broad areas or across the entire nation.

The screening tool includes 12 environmental factors*, 7 demographic factors, and a variety of 

EJ indexes*. Each EJ index combines multiple demographic factors with a single environmental 

factor (such as proximity to traffic). The screening tool has Census block group resolution, and 

provides a number of capabilities, including color coded mapping, the ability to generate a 

standard report for a selected area, and comparisons showing how a selected area compares to 

the relevant state, EPA region, or the nation as a whole.

*The National-scale Air Toxics Assessment (NATA) environmental indicators and EJ indexes, which include cancer 

risk, respiratory hazard, neurodevelopment hazard, and diesel particulate matter will be added into EJSCREEN 

during the first full public update after the soon-to-be-released 2011 dataset is made available.

Users should keep in mind that screening tools have substantial uncertainty in their 

demographic and environmental data, particularly when looking at small geographic areas, such 

as Census block groups. Also, in many cases, data on the full range of environmental impacts 

and demographic factors in any given location will not be available directly through this tool, and 

its initial results should be supplemented with additional information and local knowledge.

To access the application, navigate to http://www2.epa.gov/ejscreen
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B. EJSCREEN Web Application Home Screen

The EJSCREEN Application contains a number of user interface controls as well as data display 

and advanced analysis tools. 

To learn more about EJSCREEN, click the Home link in the top right corner of the application. 

To access help documentation for the EJSCREEN Application, click the Help link in the top right 

corner of the application.

Along the top bar of the application, a variety of widgets are available for use:

 Report on Selected Place: Pick location and see report on a user-defined place or 

block group

 Erase: Remove any drawings from the map

 Map Data: See EJSCREEN and other supplementary map data

 Measure: Measure distance, find the area of a polygon, get lat/long

 Bookmarks: Save locations for review

 Basemap: Change map background to show roads, satellite view, etc.

 Find address or place: Locate a specific address or area

For a more detailed explanation on each widget, see sections C and D.

C. Exploring and Navigating Maps

Several data display, basemap and navigation tools are available.

1. Basemaps 

Click the down arrow in the Basemap widget to change the basemap for the map display.

Click any of the basemap options to change the display of the basemap. Bing Maps Road is the 

default display.
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2. Navigation

The Navigation widget is visible in the upper left hand corner of the application. This widget 

allows manual navigation of the map display with a click interface. 

2.1 Zoom In/Out

The map display can be zoomed by using the mouse wheel to zoom in/out, using the Zoom 

In/Out tool or by bounding box

To use the Zoom In/Out tool to zoom in and out of the map display:
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1. Click the plus sign to zoom in to the map display.

2. Click the minus sign to zoom out of the map display.

To use a bounding box to zoom in on the map display:

1. Hold the shift key with one hand.

2. Hold the left mouse button and drag a rectangle to the area of interest.

3. Release the mouse button to zoom to selected area.

2.2 Pan

The Pan tool is used to scroll the map in the direction and by the amount you choose.

1. Click and hold on any location in the map display.

2. Drag the mouse, and the map will move in the corresponding direction.

3. Overview Map and Scale Bar

The Overview Map tool displays a small overview map in the lower left-hand corner of the map 

display that shows a zoomed-out view of the map data along with a gray rectangle that defines 

the map display's current view extent.

1. Click the arrow button to expand the overview map.

2. Click the arrow again to minimize the overview map back to its original position.
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The Scale Bar in the lower left corner of the map display adjusts length according to the zoom 

level. It is drawn in miles.

Note: The scale bar can be hidden when widgets are open in the EJSCREEN application. You 

may need to close widgets to view the scale bar.

D. Using EJSCREEN Widgets for Analysis

1. Bookmarks Widget

1.1 Bookmarks List

The Bookmarks widget stores a collection of map view extents or spatial bookmarks. Users 

can add their own bookmarks and then use these marks to return to a previous view or switch

between views.

1. Locate the Widget toolbar at the top of the application.

2. Click the Bookmarks icon.

The Bookmarks window will be displayed.
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1.2 Adding and Deleting Bookmarks

Use the Bookmarks widget to add a new bookmark based on the current map extent. A name 

can be provided for this bookmark at the prompt.

1. Zoom to a location of interest.

2. Click Add Bookmark in the Bookmarks widget.

An Add Bookmark text box will display.

3. Enter the name of the location of interest in the text box.

4. Click outside of the Bookmarks widget when complete to save the bookmark or click the 

blue X to remove the bookmark.

5. To edit a bookmark name click the pencil icon.

6. To remove a bookmark, click the Bookmarks button.

7. Next to the bookmark created, click the blue X.

The bookmark will be removed.
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2. Find an Address or Place Widget

The Find an Address widget allows the user to find a location of interest via an address or by 

coordinates. 

2.1 Find an Address

In the Find an address or place text box, enter an address or location to search for that 

location. This can be a street address, a town, a ZIP Code, or other location.

The application will list possible matches for the input. Click the search icon, use the enter key 

on the keyboard, or click an entry from the list.

If no matches are found for the input location, the map will remain unchanged.

1. Enter a location (for example: street address, town, ZIP Code, or other location) in the 

Enter the address text box.

2. Click the search icon.

The map display will zoom to that location if found.

2.2 Coordinates 

Searching by Coordinates allows the user to input longitude and latitude coordinates and zoom 

to that point.

1. Enter values for Longitude (X) and Latitude (Y) in the Find an address or place text 

box in the longitude, latitude format (e.g. -77.4, 38.8).
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2. Click the search icon.

The map display will zoom to that location if found.

Note: Currently, EJSCREEN indexes for Puerto Rico and the US Territories have not been 

developed. In addition, PM 2.5 and Ozone data currently are not available in EJSCREEN for 

Alaska and Hawaii.

3. Report on Selected Place Widget

The Report on Selected Place widget is used to identify a location of interest and then provide

EJ Indexes and Environmental and Demographic reports for that block group or buffer area. In 

addition to a bar chart (where scores for the location can be compared to state, regional and 

national scores), users can generate a tabular view for downloading or a graphic standard 

report in PDF format.

2012 American Community Survey (ACS), 2010 Census, and 2000 Census reports are also 

available.

The Report on Selected Place is intended for examining EJ Indexes, Environmental variables, 

and Demographic variables across block group-level data for the United States. 

1. Locate the Widget toolbar at the top of the application.

2. Click the Report on Selected Place icon.

The Report on Selected Place window will be displayed.
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3.1 Locate an Address

The Report on Selected Place widget provides options to draw a site, enter a location, or

latitude/longitude coordinate pair, click on the map to select a census block group, or enter a 

census block group id.

If a point, address, geographic coordinates or a location is selected the map will focus on a point 

and provide a 1 mile buffer as the default.

Whenever a block group is selected, by either clicking on it in the map display or entering it in 

the widget, the map zooms to that block group to allow the user to examine neighboring groups 

for variation.

1. Type in a location in the Enter a location or a latitude/longitude text box in the Report 

on Selected Place widget.

2. Click Go.

The map display zooms to the location.
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3.2 Buffer 

When user input is a geographic point a buffer is applied around the point. The ring will 

aggregate appropriate portions of the intersecting block groups, weighted by population, to 

create a representative set of data for the entire ring area, honoring variation and dispersion of 

the population in the block groups within it. For each indicator, the result is a populationweighted average, which equals the block group indicator values averaged over all residents 

who are estimated to be inside the buffer.1

 

1

For buffered areas, values are calculated following these steps:

1. The selected point is buffered using the native Geometry Service published through ArcGIS Server.

2. To spatially aggregate the EJSCREEN data for the buffered ring area for the analysis, the tool takes into account the block 

points that exist within the block groups to account for the block groups that are partially intersected with the ring area. A 

weight factor for each block group is determined by summing each block point population percentage for that block group. 

If the ring touches part of a neighboring block group that contains no block points, nothing will be aggregated; if a ring 

intersects a number of block groups, EJSCREEN indices will be aggregated within each block group based on the affiliated 

block points.

3. The aggregation is done by using factor-weighted block points.

These calculated EJSCREEN indices are returned to the web application for display in the viewer (as population and raw 

values) and for comparison against the percentile tables
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The map display will locate the point location and provide the option to add the buffer to the map 

(for example, 1-mile buffer around 1600 Pennsylvania Ave NW, Washington, DC 20004).

 
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3.3 Explore Reports

The Report on Selected Place widget Explore Reports option is driven by 31 data variables, 

displayed below:

*The National-scale Air Toxics Assessment (NATA) environmental indicators and EJ indexes will be added into 

EJSCREEN during the first full public update after the soon-to-be-released 2011 dataset is made available.

These data variables represent the data that is can be displayed in the bar chart on the bottom 

half of the widget. As the default, all data layers in the chosen group are selected. Once a data 

layer is visible, it is displayed in the Chart of Data Comparisons as well as in the Tabular Data

table (if currently visible).

For detailed descriptions of the Environmental Indicators, Demographic Indicators, and 

Environmental Justice Indexes, see the glossary at http://www2.epa.gov/ejscreen.

3.4 Chart of Data Comparisons

Above the main chart in the Report on Selected Place widget, there is a listing of which block 

group is currently selected for data display along with its State, EPA Region and total 

population:
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This graphic is slightly different for a buffer ring-based analysis, which displays the x,y 

coordinates of the center of the circle along with radius and aggregate population (estimated):

Below the identifying text, there is a series of selection check boxes that allow the user to 

control which comparative geographies are visible on the chart. The chart is built to handle one 

geography (State, Region, or USA) or all three at the same time, so the user may feel free to 

select whichever comparison is most relevant.

The chart itself displays a series of bar graphs, comparing the currently selected area (either 

block group or buffered ring) to the state, regional and national statistics for each variable. 

The y-axis of the chart runs from 0 to 100 showing percentiles. The x-axis displays different 

data variables, as selected by the user. 

Pointing to a bar will show a pop-up window including the bar's geography, the variable 

displayed, and the percentile that the selected block group or ring represents when compared to 

a larger group. For example, if your area is at the 57

th Percentile in the state, this means the 

average person there has a block group score greater than (or equal to) that of 57% of the state 

population. 
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57

th Percentile in State 86th Percentile in Region 79th Percentile Nationally

3.5 Tabular View

Below the chart data, the Tabular View button takes the displayed data and creates a table in a 

pop-up window within the application. Whichever variables are selected ("checked") in the data 

tables are displayed in this table. 

EJ indexes do not display raw data, but the rest of the data types include a raw score, state 

average and percentile, regional average and percentile, and national average and percentile. 
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The user can adjust column widths, scroll through the table, and sort the table by clicking on the 

column heading. The tabular view also includes the block group Federal Information 

Processing Standards (FIPS) code, the state, EPA region and population. This table is 

functional for both the block group selection method and the buffer ring selection method.

In the top right-hand corner of the Tabular View window, there is an icon which will allow 

the user to download data as text file. This functionality will save the tabular data to a comma 

separated value file at a location of the user's choice. The data can be imported to a 

spreadsheet program or opened as a text file for archiving or future analysis.
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3.6 Get Printable Standard Report

A user who would like a more concrete representation of the data available in EJSCREEN can 

choose to export a PDF using the Get Printable Standard Report link on the Chart or Report

widget. 

NOTE: It is important to wait for the report to finish creating, which may take 10 seconds or 

more. Do not click the Get Printable Standard Report link again until a report has been 

returned.
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Once the report is created, the user will then have the option of saving the report as PDF. 
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The Printable Standard Report report will include the following:

 The current date

 The block group that the data represents (Block group selection)

 The latitude and longitude of the center of the buffered ring (Buffer ring selection)

 The state and EPA region that the data is encompassed by

 A table of all the variables available in the widget and for each variable the following:

o Raw value (except EJ Indexes)

o State average (except EJ Indexes)

o State percentile

o Regional average (except EJ Indexes)

o Regional percentile

o National average (except EJ Indexes)

o National percentile

 A link to metadata about the report and the tool

- Values highlighted in red are above the 95th percentile.

- Zero is a known and valid value for a data element. NA (not available or “null”) means that 

no value was calculated for that data element. For example, Ozone and PM 2.5 

concentrations were not available for Alaska, so all associated data elements are set to 

“null”.

Multiple reports can be created per session.

3.7 Get 2008-2012 ACS Report, 2010 Census Report or 2000 Census Report

Three demographic report options are available under the Report on Selected Places widget 

Chart or Report option.
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The Get 2008-2012 ACS Report link provides a report with US Census Bureau American 

Community Survey (ACS) data in PDF format. 

The Get 2010 Census report link provides a report with data from the US Census Bureau, 

Census 2010 Summary File 1 in PDF format.

The Get 2000 Census report link provides a report with data from the US Census Bureau, 

Census 2000 Summary File 3 in PDF format.
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4. Erase Widget

The Erase widget is used to remove any drawings from the map.

1. Locate the Widget toolbar at the top of the application.

2. Click the Erase icon.

3. All added drawings and measurement markers will be removed from the map.

5. Map Data Widget

The Map Data widget is intended to allow users to add EJSCREEN and other supplementary 

map data along with web maps from ArcGIS Online or EPA GeoPlatform Online.

Web map layers are displayed on top of the existing map data and can be toggled on and off 

and controlled just like any other layer.

1. Locate the Widget toolbar at the top of the application.

2. Click the Map Data icon.

The Map Data options will be displayed.
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3. When map layers are added to the map, the layer legend will be added under the Select 

Map Contents menu on the right hand side of the map. Layer options are available in 

the Select Map Contents window.

5.1 Map EJSCREEN Indexes

The Map EJSCREEN Indexes option allows users to display the EJ Indexes, as well as the 

environmental indicators, and demographic indicators which comprise the EJ Indexes as colorcoded (thematic) maps.
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The data available for each of the layer groups are shown below:
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1. When the Map EJSCREEN Indexes tool is opened, PM 2.5 is selected as the default 

and is added to the map. To change the display, click a header and then click a button to 

select a layer for display.

2. This will add a map layer that will display the selected variable based on national 

percentile groups as indicated in the legend added under map contents to the right hand 

side of the map.
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3. Clicking on a block group when any of the Map EJ Indexes layers are activated will 

show a pop-up window that includes the location's blockgroup ID, indicator values, 

population count and national percentile.
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5.2 Map Supplementary Demographics

The Map Supplementay Demographics option allows users to display supplementary 

demographic information from the Census Bureau in the map.

Demographic Data is available for 2012 ACS, 2010 Census and 2000 Census data. Categories 

and variables depend on the data set. All Demographic options allow selection of method, 

breaks, colors, transparency and border.

1. Click the tab for the dataset.

2. Choose Category from the dropdown menu.

3. Select variable from dropdown menu.

4. Adjust Method, Breaks, Color, Transparency and Border if desired.

5. Click the Add to Map button to add layer to map and to the Select Map Contents Menu 

and legend. 
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5.3 Map Supplementary Layers

Options available under Map Supplementary Layers are shown below:

5.3.1 Sites Reporting to EPA

This map service contains the locations for the following program systems: Superfund (NPL), 

Toxic Releases (TRI),Water Dischargers (NPDES), Air Emissions (AFS), Hazardous Waste 

(RCRAInfo), and Brownfields (ACRES).

1. Click Map Data in the Widget toolbar.
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2. Click or mouse over Map Supplementary Layers.

3. Click Sites reporting to EPA.

4. Sites reporting to EPA will be added to the Select Map Contents menu.

5. Check boxes to add layers to the map.

5.3.2 Places

This map service contains locational data for Schools, Churches, and Hospitals from the United 

States Geological Survey (USGS) Geographic Names Information System (GNIS) service.

1. Click Map Data in the Widget toolbar.

2. Click or mouse over Map Supplementary Layers.

3. Click Places.

4. Places will be added to the Select Map Contents menu.

5. Check boxes in the Select Map Contents to add layers to the map.
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5.3.3 Transportation

This map service contains transportation layers for Airport Points, Airport Polygons and 

Railroads.

1. Click Map Data in the Widget toolbar.

2. Click or mouse over Map Supplementary Layers.

3. Click Transportation.

4. Transportation will be added to the Select Map Contents menu.

5. Check boxes in the Select Map Contents to add layers to the map.
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5.3.4 Water Features

This map service contains Water and Hydrological layers for Impaired Streams, Impaired 

Waterbodies, Streams, Water Bodies, Sole Source Aquifers, Watersheds (HUC12), Watersheds

(HUC8) (6), Wild and Scenic Rivers (Contiguous), and Wild and Scenic Rivers (Alaska).

1. Click Map Data in the Widget toolbar.

2. Click or mouse over Map Supplementary Layers.

3. Click Water Features.

4. Water Features will be added to the Select Map Contents menu.

5. Check boxes in the Select Map Contents to add layers to the map.
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5.3.5 EPA Tribal Areas

This map service contains tribal areas for lower 48 states and Alaska Native Villages, Alaska 

Native Allotments and Alaska Reservations in Alaska.

1. Click Map Data in the Widget toolbar.

2. Click or mouse over Map Supplementary Layers.

3. Click EPA Tribal Areas.

4. EPA Tribal Areas will be added to the Select Map Contents menu.

5. Check boxes in the Select Map Contents to add layers to the map.
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5.3.6 Nonattainment Area

This map service contains publically available nonattainment areas data published by EPA. 

Further information on EPA nonattainment areas can be found at 

http://www.epa.gov/oaqps001/greenbk/index.html.

1. Click Map Data in the Widget toolbar.

2. Click or mouse over Map Supplementary Layers.

3. Click Nonattainment Area.

4. Nonattainment Area will be added to the Select Map Contents menu.

5. Check boxes in the Select Map Contents to add layers to the map.
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5.3.7 Boundaries

This map service contains boundary data for ZIP Codes, Congressional Districts, City 

Boundary, Federal Lands, Townships Boundary, Counties, States, and EPA Regions.

1. Click Map Data in the Widget toolbar.

2. Click or mouse over Map Supplementary Layers.

3. Click Boundaries.

4. Boundaries will be added to the Select Map Contents menu.

5. Check boxes in the Select Map Contents to add layers to the map.
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5.3.8 Supplementary EJSCREEN data

Each tab under Supplementary EJ Indexes holds one of two supplementary EJ indexes 

combined with one of two demographic indexes. The twelve environmental indicator sublayers 

are the same for each type of EJ Index.

5.4 Search Available Data

The Search Available Data allows the user to search content on ArcGIS Online. Users with an

account through ArcGIS.com, can click "Sign In" on the top-right corner to sign in and view 

additional available information through the platform.
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1. Enter a keyword in the Enter keyword to search text box. Press Enter on the keyboard 

or click Search.
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2. Search results display in the window and add Filtering options

3. Click Add to add a layer to the Select Map Contents menu.

4. The layers can be controlled or toggled on and off in the Select Map Contents menu.
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5.5 Add layer from the Web

The Add Layer from the web allows a user to add publicly available data from the web to the 

map.

1. Select from the options by clicking the appropriate radio button.

2. Enter a valid publically available URL in the URL text box.

3. Enter the Service title in the text box if desired.

4. Click the Add to Map button.
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6. Measure Widget

The Measure widget allows the user to measure geographic distance as well obtain the 

longitude and latitude for a location on the map.

1. Locate the Widget toolbar at the top of the application.

2. Click the Measure icon.

The Measure widget will be displayed.

6.1 Measure Area
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The Measure Area tool allows the user to measure the area of a polygon.

1. Locate the Widget toolbar at the top of the application.

2. Click the Measure icon.

3. Click the Measure Area icon .

4. Area Units of Sq Miles will appear on the Measure window. A dropdown menu with all 

unit options is located next to the default units.

5. Select the desired unit.

6. Click on the map to begin drawing the polygon. Continue clicking to add to the polygon

and double click to complete the drawing.

7. The area measurement will appear in the Measure window.
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8. To remove the drawing click the Erase Icon in the toolbar, click on the map to begin a 

new drawing, or close the Measure tool.

6.2 Measure Line

The Measure Line tool allows the user to measure distance on the map display.
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1. Locate the Widget toolbar at the top of the application.

2. Click the Measure icon.

3. Click the Measure Line icon .

4. Distance Units of Miles will appear on the Measure window. A drop down menu with all 

unit options is located next to the default units.

5. Click anywhere on the map display to begin a line. Click to add points along the line or to 

add angles to the line.

6. Double-click to complete the line.

7. The distance measurement will appear in the Measure window.
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8. To remove the line click the Erase Icon in the toolbar, click on the map to begin a new 

line, or close the Measure tool.

6.3 Latitude Longitude for a point

The Measure Location tool allows the user to obtain the latitude and longitude measurements 

for a point.

1. Locate the Widget toolbar at the top of the application.

2. Click the Measure icon.

3. Click the Degrees icon .

4. Location Units of Degrees will appear on the Measure window. A drop down menu with 

unit options is located next to the default units.

5. As the mouse is moved over the map the current location will disply in the Measure 

window.

6. Click on the map to add a flag to the map and freeze the location in the measure 

window.
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7. The location measurement can be copied from the Measure window.

8. To remove the flag click the Erase Icon in the toolbar or close the Measure tool.

9. To find the measurement of a new location click the Degrees icon in the measure 

window and click the map. This will also remove the previous flag.