Chemical tanker · Marshall Islands flag · built 2008
ARS ET LABOUR: CO₂ emissions 2018–2025
IMO 9396385 EU ETS8 reporting years
- CO₂ reported 2025
- 12,411 t
- Fuel burned
- 3,927 t
- Distance
- 33,979 nm
- Time at sea
- 3,389 h
- Emitted at berth
- 9% of total
- Share of year under way
- 39%
- Gross tonnage
- 25,864
ARS ET LABOUR against its type
Built in 2008, it is 2 years older than the median chemical tanker on this register, which was built in 2010 (1,951 vessels with a known build year). At 25,864 gross tonnage it is larger than 61% of the other 1,899 chemical tankers with a recorded tonnage. It is one of 474 chemical tankers here under the Marshall Islands flag, 20.2% of the 2,344 on the register. The same builder is recorded for 21 other vessels here, 5 of them chemical tankers. Its MRV returns name it LEON DIAS for 2018, LEON ZEUS for 2019–2022 and ARS ET LABOUR for 2023–2025. The reported port of registry changed: Monrovia (2018), then Panama (2019–2023), then Majuro (2024–2025).
Its 12,411 t of CO₂ for 2025 is 2.2 times the median of 5,531 t among the 1,484 chemical tankers on this register that reported for 2025. Per nautical mile it emitted 365.2 kg CO₂, 46% above the type median of 250.2 kg. It logged 3,389 hours at sea against a median of 2,106 hours for its type that year. 9.2% of its 2025 emissions were at berth; the median for chemical tankers was 6.6%. Across 8 years with reported emissions, the highest was 2021 (12,917 t) and the lowest 2023 (1,108 t). Its efficiency percentile within the type went from 76 in 2020 to 77 in 2025 (lower is more efficient). Of the 4 sister ships listed below with a 2025 return, 1 reported a lower CO₂ per nautical mile than this vessel.
Emissions by year2018–2025
| Year | CO₂ (t) | Fuel (t) | Distance (nm) | At sea (h) | At berth (t) | kg CO₂/nm | EEOI | Percentile |
|---|---|---|---|---|---|---|---|---|
| 2025 | 12,411 | 3,927 | 33,979 | 3,389 | 1,140 | 365.2 | 24.6 | 77 |
| 2024 | 5,602 | 1,782 | 18,351 | 2,383 | 249 | 305.3 | 20.9 | 66 |
| 2023 | 1,108 | 354 | — | 419 | 44 | 415.8 | 20.8 | not ranked |
| 2022 | 11,015 | 3,474 | 16,847 | 1,754 | 4,481 | 653.8 | 38.4 | 99 |
| 2021 | 12,917 | 4,051 | 22,215 | 2,117 | 5,602 | 581.5 | 41.1 | 99 |
| 2020 | 5,024 | 1,581 | 14,949 | 4,133 | 402 | 336.1 | 13.6 | 76 |
| 2019 | 2,038 | 653 | — | 675 | 222 | 369.9 | 11.8 | not ranked |
| 2018 | 3,251 | 1,039 | — | 1,672 | 366 | 339.1 | 23.1 | not ranked |
Vessel particulars
- IMO number
- 9396385
- Previously reported as
- LEON DIAS, LEON ZEUS
- Ship type
- Chemical tanker
- Gross tonnage
- 25,864
- Length overall
- 180.0 m
- Year built
- 2008
- Flag state
- Marshall Islands per EU MRV 2025
Sources disagree: Wikidata/AIS (undated) list Panama. The flag shown is from the newest official source, the EU MRV return for 2025. - Builder
- Constanța Shipyard
- Port of registry
- Majuro MRV 2025
- Home port
- Majuro
- Technical efficiency (design)
- EEXI (5.51 gCO₂/t·nm)
- Verifier
- NORMEC VERIFAVIA SAS, France
- Accreditation
- 3-2127
- Compliance document issued
- 2026-03-31
- Compliance document expires
- 2027-06-30
Efficiency against its own type2025
Position 1,044 of 1,348 qualifying chemical tankers by EEOI, at the 77th percentile. The dashed line is the type median, 14.4; this vessel reported 24.6.
EEOI divides emissions by transport work, which for this vessel and year was 503,893,626 tonne-miles over 33,979 nautical miles.
Reported CO₂ by year
Reported CO₂ in 2025 was 281.8% higher than in 2018, for EU/EEA voyages only.
From 2024 to 2025, emissions rose 121.5% while distance sailed rose 85.2%and CO₂ per nautical mile rose 19.6%.That points mainly to how much the vessel sailed, rather than the other.
Where the 2025 emissions occurred
Methane, nitrous oxide and EU ETS2025
- Total CO₂ equivalent
- 12,604 t
- Methane (CH₄)
- 0.20 t
- Nitrous oxide (N₂O)
- 0.71 t
- Under EU ETS
- 8,375 t, 67% of total
Verifier history
| From reporting year | Verifier | Accredited in |
|---|---|---|
| 2018 | ICS Verification Services Single Member P.C. | Greece |
| 2023 | AMERICAN BUREAU OF SHIPPING HELLENIC SINGLE MEMBER LIMITED LIABILITY COMPANY (ABS HELLENIC S.M. LTD) | Greece |
| 2025 | NORMEC VERIFAVIA SAS | France |
A change of verifier is not in itself a sign of anything being wrong.
Sources and how to read this
- Emissions: EU MRV publication (THETIS-MRV), reporting years 2018–2025, published by the European Commission.
- Vessel particulars: Wikidata (CC0).
This page draws on 8 MRV reporting years, an efficiency ranking, 5 of 5 vessel particulars and a name history. Not found in the sources for this vessel: AIS movements in Norwegian waters, a licensed photograph, a sanctions listing and US port state inspections.
Empty means unreported, never zero. How EEOI, distance, percentiles and sister ships are handled is explained under reading a vessel page. Something wrong? See corrections.