Hydrogen cyanide
Hydrogen cyanide at Marathon Petroleum CO LP have more than doubled since 2011 (through 2024).
TRI facility · TRI 2024 reporting year
Marathon Petroleum CO LP
Total reported releases 849k lb rose modestly year over year (+7%). Total releases concentrations have more than doubled since 2010.
4663 W AIRLINE HWY, Garyville, Louisiana · 324110 · Petroleum · operated by Marathon Petroleum CORP
Anomaly engine
Notable Signals
Total reported releases
Total reported releases at Marathon Petroleum CO LP have more than doubled since 2010 (through 2024).
Cyclohexane
Cyclohexane releases at Marathon Petroleum CO LP rose from 19k lb to 31k lb between 2023 and 2024.
n-Hexane
n-Hexane at Marathon Petroleum CO LP have more than three-quarters since 2010 (through 2024).
Chemicals reported · most recent year
What This Facility Releases
Nitrate compounds (water dissociable; reportable only when in aqueous solution)
Nitrate compounds (water dissociable; reportable only when in aqueous solution) concentrations have fallen 14% since 2015.
Hydrogen cyanide
Hydrogen cyanide concentrations have more than doubled since 2011.
Ammonia
Ammonia concentrations have more than doubled since 2010.
Hydrogen sulfide
Hydrogen sulfide concentrations are up 44% since 2012.
Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size)
Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) concentrations have more than doubled since 2011.
Toluene
Toluene concentrations have fallen 28% since 2010.
Cyclohexane
Cyclohexane concentrations have more than doubled since 2010.
n-Hexane
n-Hexane concentrations have more than halved since 2010.
Equity context · ACS 2018-2022 block-group demographics
Who Lives Next To This Facility
Within 3 miles of this facility (6 Census block groups, population-weighted demographics): a population of 6,684. Why we surface this →
48.2%
Low-income
76.1%
People of color
6.7%
Under age 5
16.1%
Over age 64
Source: Census ACS 2018-2022 block-group demographics, population-weighted across the 3-mile buffer around this facility (from USEPA-clone/EJAM-open blockgroupstats). Indicator-level percentile and EJ-disparity scores are surfaced on the county page and the state page — they describe wider regional exposure burdens, not effects attributable to a single facility.
Source. EPA Toxics Release Inventory · retrieved 2026-05-07. Reporting year 2024. TRI is a federal public-domain dataset under 17 USC §105.
What this is not. TRI quantifies releases reported by the facility under EPCRA §313 — not ambient air or water concentrations measured at receptors. We do not attribute individual health outcomes to specific facilities; that exceeds what the data can support.