PlainEnviro

EPA TRI Chemical

Dibenzofuran

CAS Number: 132-64-9

Total releases
124.9K lbs
Number of facilities
21
Carcinogen
No
PBT substance
No
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According to the EPA Toxics Release Inventory, Dibenzofuran (CAS 132-64-9) is disclosed by 21 Form R facilities totaling 124.9K lbs of reported releases. TRI pounds are self-reported disclosure totals, not a measured public-health risk score.

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Dibenzofuran (CAS 132-64-9) is a chemical tracked by the EPA Toxics Release Inventory (TRI) program under Section 313 of the Emergency Planning and Community Right-to-Know Act. The TRI requires industrial facilities above specified threshold quantities to disclose annual manufacturing, processing, and otherwise-used volumes, along with quantities released to air, water, land, and off-site transfers.

A carcinogen flag, when present on other chemicals in this database, reflects an assessment from EPA, IARC, or the National Toxicology Program rather than a TRI-specific determination. The largest individual disclosure in the current dataset comes from KOPPERS FOLLANSBEE TAR PLANT in WV at 77.9K lbs.

TRI volumes are self-reported estimates, not measured stack emissions, and each pound counts equally regardless of chemical toxicity, so total pounds should not be equated with total risk. Inclusion of a chemical or facility in the TRI does not itself establish a health hazard; it documents the public right-to-know record. Consult EPA's IRIS (Integrated Risk Information System) and the Agency for Toxic Substances and Disease Registry for health-effect summaries.

OFFSITE pathway mix

Dibenzofuran: how the 124.9K lbs splits

124.9K lbs across all reported pathways

  • Off-site Transfers98.8K lbs79.0%
  • Air Releases20.7K lbs16.5%
  • Land Disposal4.5K lbs3.6%
  • Water Discharges1.0K lbs0.8%

Dibenzofuran's 124.9K lbs Form-R total is OFFSITE, with off-site transfers making up 79.0% of the bar. Next segment: air releases at 16.5%.

Trend & Where It's Reported

Reported Release Trend

Between 2019 and 2023, cumulative annual Dibenzofuran releases across all reporting facilities decreased by 96% (88.3K lbs → 3.5K lbs). Year-to-year swings reflect facility openings/closures and reporting changes as much as underlying activity.

Geographic Concentration

Reporting for Dibenzofuran is highly concentrated: West Virginia accounts for 78.1% of the reported total (2 facilities). Next: Florida.

  • West Virginia 97.6K lbs
  • Florida 7.7K lbs
  • Pennsylvania 5.4K lbs
  • Texas 3.9K lbs
  • Indiana 3.8K lbs
Industry Sources

Reporting for Dibenzofuran is highly concentrated by industry: Petroleum facilities account for 85.3% of the reported total (8 facilities). Next: Food.

  • Petroleum 106.6K lbs
  • Food 7.7K lbs
  • Chemicals 6.6K lbs
  • Primary Metals 3.8K lbs
  • Nonmetallic Mineral Product 143 lbs

Which facilities release the most of this chemical?

Facilities with the largest reported releases of Dibenzofuran. Up to 50 shown.

# Facility Release (lbs)
1 Koppers Follansbee Tar Plant
77.9K lbs
2 Mountain State Carbon LLC
19.7K lbs
3 Sugar Cane Growers Cooperative of Florida
7.7K lbs
4 Uss-Clairton Plant
3.9K lbs
5 Ascend Performance Materials-Chocolate Bayou Plant
3.9K lbs
6 Flint Hills Resources Pine Bend LLC
3.8K lbs
7 Cleveland-Cliffs Burns Harbor LLC
3.1K lbs
8 Coopers Creek Chemical Corp
2.2K lbs
9 Cleveland-Cliffs Cleveland Works LLC DBA Cleveland-Cliffs Wa
1.5K lbs
10 Uss Gary Works
752 lbs
11 Arbor Preservative Systems LLC
483 lbs
12 Koppers Inc
355 lbs
13 Drummond Co Inc Abc Coke Div
234 lbs
14 Cleveland-Cliffs Monessen Coke LLC
133 lbs
15 Buzzi Unicem Usa-Cape Girardeau
128 lbs
16 Bluestone Coke
22 lbs
17 Arq Solutions (operations) LLC
13 lbs
18 Giant Cement Co
10 lbs
19 Heidelberg Materials US Cement LLC
5 lbs
20 Clean Harbors Deer Park LLC
1 lbs
21 Basin Electric Antelope Valley Station
0 lbs

Frequently Asked Questions

What is Dibenzofuran in the EPA TRI? ▼
Dibenzofuran (CAS Number: 132-64-9) is a chemical tracked by the EPA Toxic Release Inventory (TRI) program. It is not marked as a carcinogen in the TRI classification set. 21 facilities in the United States report releasing this chemical to the EPA.
How much Dibenzofuran is disclosed in U.S. TRI filings? ▼
U.S. facilities have reported a total of 124.9K lbs of Dibenzofuran releases to the EPA Toxic Release Inventory across 21 facilities. Release quantities are self-reported estimates covering air, water, land, and off-site transfers. They are disclosure totals, not toxicity-weighted harm scores.
How does EPA TRI classify Dibenzofuran? ▼
Dibenzofuran is not marked as a carcinogen in the TRI classification set. TRI classification flags document inventory listing status; they are not a site-specific exposure or health diagnosis. For health-effect summaries see EPA IRIS and ATSDR toxicological profiles.
Which facilities disclose the most Dibenzofuran? ▼
Koppers Follansbee Tar Plant in WV reports the largest disclosed release of Dibenzofuran in this dataset, at 77.9K lbs. Most reporting facilities for this chemical fall under petroleum. Release data is self-reported annually to the EPA under the TRI program. View the full list of 21 facilities on this page.
What is the CAS number for Dibenzofuran? ▼
The CAS (Chemical Abstracts Service) Registry Number for Dibenzofuran is 132-64-9. CAS numbers are unique numerical identifiers assigned to every chemical substance described in the open scientific literature. This identifier is used to search scientific databases and regulatory filings.

Related Guides

Understanding TRI Data
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Biggest Polluters in America
Which facilities release the most toxics
How to Check Environmental Quality
Step-by-step guide to checking your local environment

Health Information

Data comes from the EPA Toxic Release Inventory (TRI) program. Release quantities are self-reported by facilities and may represent estimates. The total shown aggregates reports across all facilities and reporting years.

PlainEnviro presents this data without advocacy framing. The presence of a chemical in the TRI database does not by itself indicate a health risk at current exposure levels. For health-related questions about specific chemical exposures, consult your local health agency or a toxicologist.

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Data sourced from the U.S. Environmental Protection Agency (EPA). See our methodology for details. Retrieved and formatted by PlainEnviro

Disclaimer: This information is provided for informational purposes only and does not constitute professional advice. Data is sourced from the EPA Toxic Release Inventory (TRI). Consult a qualified professional before making decisions based on this data.

Read our methodology - how this data is sourced, computed, and verified.