State

Percentile

EPA Region

Percentile

USA

Percentile

1/3

Selected Variables

EJ Index for PM2.5

EJ Index for Ozone

EJ Index for NATA Diesel PM*

EJ Index for Proximity to Major Direct Dischargers

EJ Indexes

This report shows environmental, demographic, and EJ indicator values. It shows environmental and demographic raw data (e.g., the estimated concentration of 

ozone in the air), and also shows what percentile each raw data value represents. These percentiles provide perspective on how the selected block group or 

buffer area compares to the entire state, EPA region, or nation. For example, if a given location is at the 95th percentile nationwide, this means that only 5 

percent of the US population has a higher block group value than the average person in the location being analyzed. The years for which the data are available, 

and the methods used, vary across these indicators. Important caveats and uncertainties apply to this screening-level information, so it is essential to understand 

the limitations on appropriate interpretations and applications of these indicators. Please see EJSCREEN documentation for discussion of these issues before using 

reports.

EJ Index for NATA Air Toxics Cancer Risk*

EJ Index for NATA Respiratory Hazard Index*

EJ Index for NATA Neurological Hazard Index*

EJ Index for Traffic Proximity and Volume

EJ Index for Lead Paint Indicator 

EJ Index for Proximity to NPL sites

EJ Index for Proximity to RMP sites

EJ Index for Proximity to TSDFs

EJSCREEN Report

N/A N/A6360 N/A N/A528

52525152 N/A N/A5144 N/A N/A361737373637 N/A N/A7166 N/A N/A604360615961 for 9 mile Ring Centered at 36.903135,-111.390242, ARIZONA, EPA Region 9 Approximate Population: 9081 SRP - Navajo Generating Station November 23, 2015
2/3

EJSCREEN Report

for 9 mile Ring Centered at 36.903135,-111.390242, ARIZONA, EPA Region 9 Approximate Population: 9081 SRP - Navajo Generating Station November 23, 2015
EJSCREEN Report

Raw

Data

State

Avg.

%ile in

State

EPA 

Region

Avg.

%ile in

EPA 

Region

USA

Avg.

%ile in

USA

3/3

RMP Proximity (facility count/km distance)

TSDF Proximity (facility count/km distance)

Water Discharger Proximity (facility count/km distance)

Demographic Index

Population over 64 years of age

Minority Population

Low Income Population

Linguistically Isolated Population

Population With Less Than High School Education

Population Under 5 years of age

Demographic Indicators

EJSCREEN is a screening tool for pre-decisional use only. It can help identify areas that may warrant additional consideration, analysis, or outreach. It does not 

provide a basis for decision-making, but it may help identify potential areas of EJ concern. Users should keep in mind that screening tools are subject to substantial 

uncertainty in their demographic and environmental data, particularly when looking at small geographic areas. Important caveats and uncertainties apply to this 

screening-level information, so it is essential to understand the limitations on appropriate interpretations and applications of these indicators. Please see 

EJSCREEN documentation for discussion of these issues before using reports. This screening tool does not provide data on every environmental impact and 

demographic factor that may be relevant to a particular location. EJSCREEN outputs should be supplemented with additional information and local knowledge 

before taking any action to address potential EJ concerns.

For additional information, see: www.epa.gov/environmentaljustice

Selected Variables

Environmental Indicators

Particulate Matter (PM 2.5 in μg/m3)

Ozone (ppb)

NATA Diesel PM (μg/m3)

*

NATA Cancer Risk (lifetime risk per million)

*

NATA Respiratory Hazard Index*

NATA Neurological Hazard Index*

Traffic Proximity and Volume (daily traffic count/distance to road)

Lead Paint Indicator (% Pre-1960 Housing)

NPL Proximity (site count/km distance)

* 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. The National-Scale Air Toxics Assessment (NATA) is EPA's ongoing, comprehensive evaluation of air toxics in the United States. EPA developed the 

NATA to prioritize air toxics, emission sources, and locations of interest for further study. It is important to remember that NATA provides broad estimates of 

health risks over geographic areas of the country, not definitive risks to specific individuals or locations. More information on the NATA analysis can be found 

at: http://www.epa.gov/ttn/atw/natamain/index.html.

for 9 mile Ring Centered at 36.903135,-111.390242, ARIZONA, EPA Region 9 Approximate Population: 9081 SRP - Navajo Generating Station November 23, 2015 54.7 5.72 N/A 0.0088 0.0028 0.0052 0.0037 0.0854

N/A N/A N/A 42% 48%9%7% 14%4% 36% 54.7 7.93 N/A 0.22 0.092 0.29 0.065 0.094 100 N/A N/A N/A 40% 42% 37%5% 15%7% 14% 46% 57% 35%9% 18%7% 12% 35% 36% 34%5% 14%7% 13% 49.7 9.95 N/A 0.19 0.12 0.41 0.11 0.25 190 N/A N/A N/A 46.1 9.78 N/A 0.25 0.054 0.31 0.096 0.3 110 N/A N/A N/A 463

N/A0

0

0

0

7312 N/A N/A N/A60635262605650 45405641525847 67685868616336 650

N/A0

0

0

1

425

N/A N/A N/A 900

N/A0

2

0

0

329

N/A N/A N/A