Special Sampling Projects - Portsmouth Gaseous Diffusion Plant

The Portsmouth Gaseous Diffusion Plant is a former uranium enrichment plant located in Pike County, Ohio. From 1954 until 2001, the facility enriched uranium to be used in nuclear reactors and weapons. Since 1989, the U.S. DOE has been involved in clean up of the site and is now actively working on decommissioning many of the buildings at this location. The purpose of the air quality monitoring close to the perimeter of the facility is to evaluate the air quality that is at the five locations near the property boundary of the site.

As a part of this monitoring effort, Ohio EPA and the U.S. DOE are operating five monitoring sites as seen in the figure below where both agencies independently monitor for the same parameters at each site.  This website is dedicated to providing the public access to the Ohio EPA data. The following parameters are monitored at each site at the indicated frequency:

  • PM2.5 – continuously
  • PM10 – continuously
  • Asbestos – collected on a 1 in 6 day frequency
  • Metals – collected on a 1 in 6 day frequency include:
    • Antimony
    • Arsenic
    • Beryllium
    • Cadmium
    • Chromium
    • Cobalt
    • Lead
    • Manganese
    • Mercury
    • Nickel Selenium
  • VOCs - collected on a 1 in 12 day frequency include:
    • 1,1,1-Trichloroethane
    • 1,1,2-Trichloroethane
    • 1,1-Dichloroethane
    • 1,1-Dichloroethene
    • 1,2-Dichloroethane
    • 1,4-Dioxane
    • 2-Butanone
    • 4-Methyl-2-pentanone
    • Benzene
    • Carbon disulfide
    • Carbon tetrachloride
    • Chloroethane
    • Chloroform
    • cis-1,2-Dichloroethene
    • Methylene chloride
    • Tetrachloroethene
    • Toluene
    • trans-1,2-Dichloroethene
    • Trichloroethene
    • Vinyl chloride

Sampling began sporadically in November of 2020; therefore, the data records will be less complete for the earlier month(s).

  • For continuous PM2.5 and PM10 data for the “current month”, these reports present the data in RAW form, meaning that the data you see are exactly what was collected electronically from each pollution monitor throughout each day. It is important to remember that RAW data are never considered valid until verified by Ohio EPA, a process that can take much more time than the nearly immediate data availability on this website. Thus, data seen here may not necessarily be FINAL data. Please bear in mind that what you see in these reports will not always be 100 percent accurate.  All continuous data identified for “past months” on this page will be quality assured FINAL data. Quality assurance takes up to 30 days after the month in which it was collected; therefore continuous data for “past months” will be posted approximately 60 days after the month in which the data is collected (example, February data quality assured by the end of March and posted on this website by the end of April).
  • For intermittent data (Asbestos, VOCs and Metals), these reports present data that have been collected for a given month, sent to the lab for analysis and returned (takes up to 30 days), and then quality assured by Ohio EPA.  Therefore, intermittent data will be posted approximately 90 days after the month in which the data is collected (example: January data processed by the lab by end of February and quality assured by the end of March and posted on this website by the end of April).
  • Calculations for averages and maximums for all VOC, metals and asbestos pollutants include all values reported for the month, including those above the method detection limit (MDL) but below the reporting limit (RL) and those below the MDL.
  • The meaning of qualifier codes appearing in these reports can be found here: https://aqs.epa.gov/aqsweb/documents/codetables/qualifiers.html

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PM2.5 PM10
Asbestos VOCs Metals


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