The lead paint indicator is the percentage of occupied housing units built before 1960, calculated from the U.S. Census Bureau’s ACS 5-year summary estimates on age of housing stock. EJScreen uses age of housing stock as a surrogate for potential lead exposure as regulations banning lead-based residential paint in 1978 led to the reduction and…
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…
The air toxics respiratory HI indicator is the respiratory HI from the analyzed carcinogens in ambient outdoor air, as provided by the 2017 Air Toxics Data Update. The data is reported at the Census tract level. Block group level values are assigned by repeating each parent tract level value.
The air toxics cancer risk indicator is the estimated lifetime inhalation cancer risk from the analyzed carcinogens in ambient outdoor air, as provided by the 2017 Air Toxics data Update. The value of the indicator is persons per million lifetime. The data is reported at the Census tract level. Block group level values are assigned…
The Diesel PM indicator is the estimated concentration of Diesel PM as provided by the 2017 Air Toxics update. The value of the indicator is in µg /m3 , and reported at the Census tract level. Block group level values are assigned by repeating each parent tract level value.
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…
The PM 2.5 indicator is a measure of potential exposure to inhalable particles that are 2.5 micrometers or smaller. This is measured in terms of annual average concentration in air measured in micrograms per cubic meter. PM 2.5 information included in EJScreen highlights areas across the U.S. that are not meeting the national ambient air…
The new school segregation index data are now available for the year of 2021-2022. Data were from the 2021-2022 National Center for Education Statistics (NCES) and are used for the 2023 County Health Rankings. This indicator reports the extent to which students within different race and ethnicity groups are unevenly distributed across schools when compared with…
The new three-year average life expectancy data for the years of 2018-2020 are now available. Data were from the National Center for Health Statistics – Mortality Files (2018-2020) and are used for the 2023 County Health Rankings. The average number of years a person can expect to live are reported for US states and counties with…
The new seven-year average infant mortality data for 2014-2020 are now available. Data were from the National Center for Health Statistics – Mortality files and are used for the 2023 County Health Rankings. The seven-year average number of infant deaths per 1,000 live birth are reported for US states and counties with >= 20 teen births…