The ozone indicator in EJScreen reflects potential ozone exposure measured in terms of summer
seasonal daily average maximum concentrations in an 8-hour period measured in parts per billion.
Ozone information included in EJScreen highlights areas across the U.S. that are not meeting the
national ambient air quality standard for ozone. In other words, the levels of ozone present in these
areas are deemed harmful to human health.
The ozone indicator in EJScreen is a measure of potential exposure but not a measure of risk. The raw
ozone data is compiled by census tract, which is supplied for use in the tool by EPA’s OAQPS. For air
toxics risk measures (as opposed to exposure) users can turn to EJScreen’s other three indicators: cancer
risk, respiratory HI, and diesel PM.
Opioid Use Disorder by County, Medicare Population, 2021
This layer displays the percentage of Medicare beneficiaries with opioid use disorder in the latest report year (2020).
EJ Screen Traffic Proximity
The traffic proximity indicator is based on AADT count divided by distance in meters from the Census
block centroid. The proximity score is based on the traffic within a search radius of 500 meters (or
further if none is found in that radius). This distance was selected to be large enough to capture the
great majority of road segments (with traffic data) that could have a significant impact on the local
residents, balanced against the need to limit the scope due to computational constraints. The closest
traffic is given more weight, and the distant traffic is given less weight, through inverse distance
weighting. For example, traffic 500 meters away is given only one tenth as much weight as traffic 50
meters away.
Public Education Expenditures
This layer data from the National Center for Education Statistics (NCES) Common Core of Data (CCD) School District Finance Survey. The survey provides finance data for all local education agencies (LEAs) that provide free public elementary and secondary education in the United States. County-level data was generated by CARES by aggregating school-district level records with valid reported figures for total students and total expenditures.
Air Quality – Ozone Levels (O3) by Census Tract, 2018
This layer displays the daily average concentration of ozone and the percentage of days with concentrations of ozone above the National Ambient Air Quality Standard (NAAQS) of 0.075 parts per million in 2018.
Air Quality – Daily Concentration, Particulate Matter (PM 2.5) by County, 2017
This layer displays the daily average concentration of fine particulate matter and the percentage of days with concentrations of fine particulate matter above the National Ambient Air Quality Standard (NAAQS) of 35.0 micrograms per cubic meter in 2018.
Prescription Drug Claims for Opioids by ZIP Code and County, 2019
Layer displays the percentage of claims for prescription drugs among Medicare Part D beneficiaries that were for opioid drugs in 2021. Data is available by county and ZIP Code Tabulation Area (ZCTA).
Air Quality – Ozone Levels (O3) by Census Tract, 2017
This layer displays the daily average concentration of ozone and the percentage of days with concentrations of ozone above the National Ambient Air Quality Standard (NAAQS) of 0.075 parts per million in 2017.
Medical Debt in Collections, 2023
This layer displays debt information at the state and county levels from the Urban Institute’s 2023 Debt in America. Data includes medical debt, student loan debt, automobile debt, retail debt and any debt in collections based on February 2022 credit bureau records.
Air Quality – Daily Concentration, Particulate Matter (PM 2.5) by County, 2017
This layer displays the daily average concentration of fine particulate matter and the percentage of days with concentrations of fine particulate matter above the National Ambient Air Quality Standard (NAAQS) of 35.0 micrograms per cubic meter in 2017.