• air pollution
  • asthma
  • environmental health
  • ozone

Daily Census Tract-Level Ozone Concentrations, 2011-2014

Daily Census Tract-Level Ozone Concentrations, 2011-2014

This dataset provides modeled predictions of ozone levels from the EPA's Downscaler model. Data are at the census tract level for 2011-2014. These data are used by the CDC's National Environmental Public Health Tracking Network to generate air quality measures. Census tract-level datasets contain estimates of the mean predicted concentration and associated standard error. Please refer to the metadata attachment for more information.

Learn more about outdoor air quality on the Tracking Network's website:

By using these data, you signify your agreement to comply with the following requirements:

  1. Use the data for statistical reporting and analysis only.

  2. Do not attempt to learn the identity of any person included in the data and do not combine these data with other data for the purpose of matching records to identify individuals.

  3. Do not disclose of or make use of the identity of any person or establishment discovered inadvertently and report the discovery to:

  4. Do not imply or state, either in written or oral form, that interpretations based on the data are those of the original data sources and CDC unless the data user and data source are formally collaborating.


NameSocrata field nameColumn name in sgr mountData typeDescription
yearyearyearTextYear of estimate
countyfipscountyfipscountyfipsTextCounty FIPS code
ds_o3_stddds_o3_stddds_o3_stddNumberStandard error of the estimated ozone concentration
statefipsstatefipsstatefipsTextState FIPS code
longitudelongitudelongitudeNumberLongitude of census tract centroid
ctfipsctfipsctfipsTextCensus tract FIPS code
ds_o3_predds_o3_predds_o3_predNumberMean estimated 8-hour average ozone concentration in parts per billion (ppb) within 3 meters of the surface of the earth
latitudelatitudelatitudeNumberLatitude of census tract centroid
datedatedateTextDate (day-month-year) of estimate

Upstream Metadata