Methodology
About Emission Map
What is this tool?
Emission Map lets you enter a home address and see every industrial facility within your chosen radius that reported toxic chemical releases to the EPA — including chemical names, quantities released (in pounds), air/water pathways, and EPA carcinogen and PFAS classifications.
The data is entirely public. Federal law (EPCRA Section 313) requires ~21,000 industrial facilities to disclose their toxic chemical releases each year. Emission Map makes this data searchable by address.
Data source
All data comes from the EPA Toxic Release Inventory (TRI) Basic Data Files, published annually by the U.S. Environmental Protection Agency. Facilities report releases by July 1 each year for the prior calendar year. EPA publishes quality-checked data in November — approximately 14–16 months behind real-time.
Data currency: Reporting Year 2024 data was published November 2025. "Reporting Year 2024" means releases that occurred during calendar year 2024.
What TRI covers — and what it doesn't
TRI covers facilities that:
- Are in specific industrial sectors (manufacturing, federal facilities, mining, utilities, etc.)
- Have 10 or more full-time employees
- Manufacture, process, or otherwise use a listed TRI chemical above threshold quantities
Not included: smaller facilities, dry cleaners, gas stations, agricultural operations, vehicle exhaust, and other non-industrial sources. A result of "no facilities found" does not mean the area is clean — it means no TRI-reporting facilities are present.
EPA classifications: CARCINOGEN, PFAS, PBT
The CARCINOGEN, PFAS, and PBT labels shown on facility cards are EPA's own classifications from the TRI dataset — not editorial determinations made by this tool. These classifications appear in the EPA TRI Basic Data Files exactly as we display them.
- CARCINOGEN — EPA or IARC classified as a known or probable human carcinogen
- PFAS — per- and polyfluoroalkyl substance, as classified by EPA TRI
- PBT — persistent, bioaccumulative, and toxic chemical per EPA TRI designation
How proximity search works
Your address is geocoded using the Census Bureau Geocoder (Nominatim/OpenStreetMap as fallback). The resulting latitude/longitude is used to query a PostGIS spatial database for all TRI-reporting facilities within your selected radius, using a geographic distance calculation (haversine, in meters). Results are ordered by total on-site release quantity, largest first.
What this tool does not do
- We do not calculate health risk or exposure. We display EPA-reported quantities only.
- We do not rank facilities as "dangerous." The data speaks for itself.
- We do not add risk scores or editorial analysis beyond what EPA's own classifications say.
Legal and data attribution
All data displayed is sourced directly from EPA TRI Basic Data Files, which are public domain federal government data. EPCRA Section 313 (1986) mandates public disclosure of this information. Every facility card links to the facility's official EPA ECHO profile for verification.
Disclaimer: This tool displays federally reported information only. It does not constitute legal advice, environmental consulting, or health guidance. For official data, visit EPA TRI or EPA ECHO.