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 by repeating each parent tract level value.
EJ Screen Air Toxic Respiratory Risk
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.
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.
EJ Screen Lead Paint Exposure
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 finally an end to the use of such paint in housing. The percentage
of older housing units is a proxy for potential exposure to lead paint and lead-containing dust that
accumulates indoors, in homes, or in other buildings where lead paint was used. EJScreen uses housing
units built before 1960.
Data from the 2023 County Health Rankings are here!
Data and maps from the 2023 County Health Rankings are now available! Click the map icon to view the rank and underlying data for Premature Death, or search for additional updates by searching the Map Room for the term “CHR 2023”.
Residential Vacancies – 2020 Q4
This layer displays residential vacancy rates and total residential vacancies in census tracts across the United States. Vacancy rates are reported quarterly.
Business Vacancies – 2020 Q4
This layer displays business vacancy rates and total business vacancies in census tracts across the United States. Vacancy rates are reported quarterly.
Affordable Connectivity Program Subscribers
This layer displays the total number of household subscribers in the Affordable Connectivity Program by data month. The Affordable Connectivity Program is an FCC benefit program that helps ensure that households can afford the broadband they need for work, school, healthcare and more.
LEHD Commuting Data
This layer displays the net commuting flow for counties and census tracts from the 2022 LEHD Location-Origin Dataset. Other commuting data layers are also available in the same data release including out commuters, in commuters, and workplace area characteristics. These other layers can be found by searching for LEHD.
Commuting Distances
This layer displays the mean distance traveled by commuters, based on the centroids of the census blocks in which the reside and work. The mean was calculated excluding those records where the distance traveled was over 125 miles one-way. Additional data layers are available which show the proportion of commuters with a short (< 5 miles), moderate (5 – 25 miles), long (25 – 75 miles), or very long (75 – 125 miles) commute.