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EPA TRI Chemical

Thorium Dioxide

CAS Number: 1314-20-1

Total releases
11 lbs
Number of facilities
3
Carcinogen
No
PBT substance
No
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According to the EPA Toxics Release Inventory, Thorium Dioxide (CAS 1314-20-1) is disclosed by 3 Form R facilities totaling 11 lbs of reported releases. TRI pounds are self-reported disclosure totals, not a measured public-health risk score.

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Thorium Dioxide (CAS 1314-20-1) 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 FAURECIA INTERIOR SYSTEM in MO at 10 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.

AIR pathway mix

Thorium Dioxide: how the 11 lbs splits

11 lbs across all reported pathways

  • Air Releases11 lbs100.0%

Thorium Dioxide's 11 lbs Form-R total is AIR, with air releases making up 100.0% of the bar. Off-site transfers stay separate from air, water, and land releases.

Trend & Where It's Reported

Reported Release Trend

Between 2019 and 2023, cumulative annual Thorium Dioxide releases across all reporting facilities decreased by 100% (5 lbs → 0 lbs). Year-to-year swings reflect facility openings/closures and reporting changes as much as underlying activity.

Geographic Concentration

Reporting for Thorium Dioxide is highly concentrated: Missouri accounts for 95.2% of the reported total (1 facility). Next: Texas.

  • Missouri 10 lbs
  • Texas 1 lbs
Industry Sources

Reporting for Thorium Dioxide is highly concentrated by industry: Transportation Equipment facilities account for 95.2% of the reported total (1 facility). Next: Chemicals.

  • Transportation Equipment 10 lbs
  • Chemicals 1 lbs

Which facilities release the most of this chemical?

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

# Facility Release (lbs)
1 Faurecia Interior System
10 lbs
2 Ascend Performance Materials-Chocolate Bayou Plant
1 lbs
3 Dow Chemical Co Freeport Facility
0 lbs

Frequently Asked Questions

What is Thorium Dioxide in the EPA TRI? ▼
Thorium Dioxide (CAS Number: 1314-20-1) is a chemical tracked by the EPA Toxic Release Inventory (TRI) program. It is not marked as a carcinogen in the TRI classification set. 3 facilities in the United States report releasing this chemical to the EPA.
How much Thorium Dioxide is disclosed in U.S. TRI filings? ▼
U.S. facilities have reported a total of 11 lbs of Thorium Dioxide releases to the EPA Toxic Release Inventory across 3 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 Thorium Dioxide? ▼
Thorium Dioxide 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 Thorium Dioxide? ▼
Faurecia Interior System in MO reports the largest disclosed release of Thorium Dioxide in this dataset, at 10 lbs. Most reporting facilities for this chemical fall under transportation equipment. Release data is self-reported annually to the EPA under the TRI program. View the full list of 3 facilities on this page.
What is the CAS number for Thorium Dioxide? ▼
The CAS (Chemical Abstracts Service) Registry Number for Thorium Dioxide is 1314-20-1. 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
How the Toxic Release Inventory works
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.