Propylene
Propylene at Shell Norco Chemical Plant have more than doubled since 2010 (through 2024).
TRI facility · TRI 2024 reporting year
Shell Norco Chemical Plant
Total reported releases 5.7M lb rose by an order of magnitude year over year (+742%). Total releases concentrations have more than doubled since 2010.
15536 RIVER RD, Norco, Louisiana · 324110 · Petroleum · operated by Shell Petroleum INC
Anomaly engine
Notable Signals
Total reported releases
Total reported releases at Shell Norco Chemical Plant have more than doubled since 2010 (through 2024).
Propylene
Propylene releases at Shell Norco Chemical Plant rose from 371k lb to 5.2M lb (14.0×) between 2023 and 2024.
Ethylene
Ethylene releases at Shell Norco Chemical Plant rose from 56k lb to 241k lb (4.3×) between 2023 and 2024.
Showing the 4 most editorially weighted signals out of 5. Lower-severity signals fold into the chemical breakdown and history charts below.
Chemicals reported · most recent year
What This Facility Releases
Propylene
Propylene concentrations have more than doubled since 2013.
Ethylene
Ethylene concentrations are up 69% since 2010.
Benzene
Benzene concentrations have more than halved since 2010.
Toluene
Toluene concentrations have fallen 46% since 2010.
Ammonia
Ammonia concentrations have fallen 37% since 2010.
1,3-Butadiene
1,3-Butadiene concentrations have more than halved since 2010.
Xylene (mixed isomers)
Xylene (mixed isomers) concentrations have more than halved since 2010.
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.
Equity context · ACS 2018-2022 block-group demographics
Who Lives Next To This Facility
Within 3 miles of this facility (7 Census block groups, population-weighted demographics): a population of 9,049. Why we surface this →
19.8%
Low-income
17.7%
People of color
4.5%
Under age 5
15.9%
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.