Most Emission-Efficient Chemical Tankers
Ships ranked by AER (Annual Efficiency Ratio) — grams of CO₂ emitted per tonne of deadweight carried one nautical mile (g CO₂/dwt·nm), the IMO carbon-intensity metric behind the CII rating — from official EU MRV emissions data for reporting year 2025. Lower is greener. Pick a segment and size class to see the greenest vessels first.
| # | Vessel | Size (DWT) | Built | Carbon intensity — AER (g CO₂/dwt·nm) | Grade |
|---|---|---|---|---|---|
| 551 |
MALBEC LEGACY
IMO 9732826
|
37,596 | 2016 |
7.2
|
B |
| 552 |
STOLT SNELAND
IMO 9352212
|
44,080 | 2008 |
7.2
|
B |
| 555 |
FAIRCHEM PINNACLE
IMO 9984273
|
26,359 | 2025 |
7.2
|
B |
| 554 |
PIGEON POINT
IMO 9322396
|
48,356 | 2005 |
7.2
|
B |
| 553 |
GULF BAYNUNAH
IMO 9381562
|
46,522 | 2008 |
7.2
|
B |
| 556 |
RHAPSODY
IMO 9810666
|
34,766 | 2020 |
7.2
|
B |
| 557 |
SC TAURUS
IMO 9801081
|
40,962 | 2017 |
7.2
|
B |
| 558 |
ANATOLIA
IMO 9388003
|
46,583 | 2008 |
7.2
|
B |
| 559 |
KRITI BAY
IMO 9418573
|
50,998 | 2006 |
7.2
|
B |
| 561 |
ANTARES
IMO 9800817
|
40,356 | 2022 |
7.2
|
B |
| 560 |
TORM ANABEL
IMO 9543550
|
49,948 | 2012 |
7.2
|
B |
| 562 |
BOW CHAIN
IMO 9214317
|
37,518 | 2002 |
7.2
|
B |
| 564 |
SAKHARA LOTUS
IMO 9400382
|
32,107 | 2009 |
7.2
|
B |
| 563 |
PACIFIC STAR
IMO 9363481
|
33,707 | 2008 |
7.2
|
B |
| 565 |
NAVIG8 EXECUTIVE
IMO 9973937
|
49,143 | 2024 |
7.3
|
B |
| 566 |
NCC MAHA
IMO 9387683
|
46,265 | 2009 |
7.3
|
B |
| 569 |
CHEMTRANS MOBILE
IMO 9732802
|
37,596 | 2016 |
7.3
|
B |
| 568 |
ARCHANGELOS MICHAEL
IMO 9747340
|
49,999 | 2016 |
7.3
|
B |
| 567 |
STELLA MARIA
IMO 9407378
|
50,242 | 2008 |
7.3
|
B |
| 570 |
SEA HORSE
IMO 9262584
|
27,185 | 2002 |
7.3
|
C |
| 572 |
SEAVICTORY
IMO 9315783
|
46,700 | 2007 |
7.3
|
C |
| 571 |
MISTRAL FLAME
IMO 9907017
|
33,343 | 2019 |
7.3
|
C |
| 573 |
STOLT SYPRESS
IMO 9150315
|
36,677 | 1998 |
7.3
|
C |
| 574 |
QUARTZ
IMO 9694361
|
49,999 | 2015 |
7.3
|
C |
| 577 |
STOLT LERK
IMO 9719252
|
32,836 | 2017 |
7.4
|
C |
| 576 |
SUPERBA
IMO 9538165
|
37,949 | 2014 |
7.4
|
C |
| 575 |
BOW CAPRICORN
IMO 9752010
|
40,929 | 2014 |
7.4
|
C |
| 578 |
FJELLANGER
IMO 9387724
|
46,287 | 2010 |
7.4
|
C |
| 580 |
NCC NOOR
IMO 9399260
|
45,565 | 2011 |
7.4
|
C |
| 579 |
CHIP
IMO 9353101
|
37,293 | 2008 |
7.4
|
C |
| 581 |
CHEMROAD ROSE
IMO 9317846
|
32,046 | 2005 |
7.4
|
C |
| 582 |
HAFNIA ARAGONITE
IMO 9727558
|
38,506 | 2015 |
7.4
|
C |
| 584 |
CHEMROAD DITA
IMO 9414242
|
33,554 | 2009 |
7.4
|
C |
| 583 |
NEW ENGLAND
IMO 9298727
|
37,515 | 2005 |
7.4
|
C |
| 585 |
SC FALCON
IMO 9746190
|
33,984 | 2016 |
7.5
|
C |
| 586 |
ELKA DELOS
IMO 9259290
|
44,598 | 2000 |
7.5
|
C |
| 587 |
GREEN SPINEL
IMO 9583653
|
51,034 | 2012 |
7.5
|
C |
| 588 |
EASTERLY SYMPHONY
IMO 9464560
|
36,677 | 2009 |
7.5
|
C |
| 590 |
ARDMORE DEFENDER
IMO 9707390
|
37,764 | 2013 |
7.5
|
C |
| 589 |
BOW OPTIMA
IMO 9818541
|
49,042 | 2020 |
7.5
|
C |
| 591 |
STOLT LIND
IMO 9719264
|
32,821 | 2017 |
7.5
|
C |
| 592 |
BOW ORION
IMO 9818515
|
49,042 | 2019 |
7.5
|
C |
| 594 |
GINGA ENDURANCE
IMO 9800441
|
25,986 | 2020 |
7.5
|
C |
| 595 |
STOLT ORCA
IMO 9597147
|
33,559 | 2013 |
7.5
|
C |
| 593 |
GEMMA
IMO 9808314
|
40,019 | 2018 |
7.5
|
C |
| 597 |
BOW COMPASS
IMO 9412737
|
33,609 | 2009 |
7.5
|
C |
| 596 |
NCC SAMA
IMO 9480150
|
45,471 | 2012 |
7.5
|
C |
| 598 |
CHEM HELEN
IMO 9340116
|
38,396 | 2007 |
7.5
|
C |
| 599 |
PURPLE RAY
IMO 9804899
|
19,987 | 2020 |
7.5
|
C |
| 600 |
COURAGE
IMO 9335056
|
45,965 | 2008 |
7.6
|
C |
Which engines power the greenest fleets?
The main engine is the single largest CO₂ source on board — typically well over 80% of a ship's emissions come from propulsion. We aggregated this ranking the other way around: every engine design is scored by the measured carbon intensity of the vessels carrying it, licensee-built units merged under their design brand. The verdict from the 2025 data — modern dual-fuel designs like MAN B&W's ME-GI and WinGD's X-DF families, together with EGR/SCR-abated and ultra-long-stroke G-type engines, consistently power the most emission-friendly ships in service.
AER (Annual Efficiency Ratio) = annual CO₂ emissions ÷ (deadweight × distance sailed), the IMO carbon-intensity metric used for CII ratings. It is built only from measured CO₂, distance and deadweight — not the self-reported cargo transport-work figure, which is unreliable. Implausible outliers (top 2% per segment) are excluded. Grade A–E reflects each vessel's rank within its segment. Source: EMSA THETIS-MRV.