Diethanolamine
Diethanolamine releases at Par Montana Billings Refinery rose from 8k lb to 21k lb (2.5×) between 2023 and 2024.
TRI facility · TRI 2024 reporting year
Par Montana Billings Refinery
Total reported releases 184k lb rose meaningfully year over year (+16%). Total releases concentrations have fallen 28% since 2010.
700 PAR MONTANA RD, Billings, Montana · 324110 · Petroleum · operated by Par Pacific Holdings INC
Anomaly engine
Notable Signals
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) releases at Par Montana Billings Refinery rose from 26k lb to 42k lb between 2023 and 2024.
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) at Par Montana Billings Refinery have more than halved since 2010 (through 2024).
Chemicals reported · most recent year
What This Facility Releases
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 halved since 2010.
Ethylene glycol
Ethylene glycol concentrations have more than doubled since 2010.
n-Hexane
n-Hexane concentrations are roughly unchanged from 2010.
Diethanolamine
Diethanolamine concentrations have more than doubled since 2010.
Ammonia
Ammonia concentrations are up 12% since 2010.
Toluene
Toluene concentrations are up 46% since 2010.
Ethylene
Ethylene concentrations are up 17% since 2010.
Xylene (mixed isomers)
Xylene (mixed isomers) concentrations are up 46% since 2010.
Equity context · ACS 2018-2022 block-group demographics
Who Lives Next To This Facility
Within 3 miles of this facility (19 Census block groups, population-weighted demographics): a population of 28,264. Why we surface this →
27.4%
Low-income
16.5%
People of color
6.7%
Under age 5
15.6%
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.