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 |
|---|---|---|---|---|---|
| 652 |
NOCTURNE
IMO 9804863
|
37,245 | 2020 |
7.9
|
C |
| 651 |
CHEMROAD JOURNEY
IMO 9414254
|
33,526 | 2009 |
7.9
|
C |
| 653 |
NCC DANAH
IMO 9419541
|
45,579 | 2011 |
7.9
|
C |
| 654 |
BOW AQUARIUS
IMO 9753791
|
40,900 | 2016 |
7.9
|
C |
| 657 |
GC BERYL
IMO 9924912
|
19,994 | 2021 |
7.9
|
C |
| 656 |
SAANA
IMO 9739836
|
17,991 | 2018 |
7.9
|
C |
| 655 |
HAFNIA TORRES
IMO 9729283
|
39,067 | 2016 |
7.9
|
C |
| 658 |
DYLAN
IMO 9421336
|
50,319 | 2009 |
8.0
|
C |
| 661 |
LADY RINA
IMO 9631383
|
39,310 | 2012 |
8.0
|
C |
| 660 |
STOLT ARGON
IMO 9739288
|
27,579 | 2016 |
8.0
|
C |
| 659 |
ALDEBARAN
IMO 9723007
|
37,887 | 2014 |
8.0
|
C |
| 663 |
BOW CARDINAL
IMO 9114244
|
37,446 | 1997 |
8.0
|
C |
| 662 |
NCC QAMAR
IMO 9387671
|
46,195 | 2009 |
8.0
|
C |
| 664 |
ELENORE
IMO 9335836
|
34,497 | 2010 |
8.0
|
C |
| 666 |
AFOVOS
IMO 9428346
|
49,999 | 2009 |
8.0
|
C |
| 665 |
STOLT PALM
IMO 9764506
|
32,761 | 2018 |
8.0
|
C |
| 667 |
BOW HARMONY
IMO 9379909
|
33,619 | 2008 |
8.0
|
C |
| 668 |
SAKURA ADVANCE
IMO 9568495
|
27,000 | 2010 |
8.0
|
C |
| 669 |
NCC SAFA
IMO 9411329
|
45,471 | 2011 |
8.0
|
C |
| 671 |
MTM AMSTERDAM
IMO 9776444
|
21,176 | 2018 |
8.0
|
C |
| 670 |
MIAMI LIGHT
IMO 9724702
|
45,999 | 2017 |
8.0
|
C |
| 672 |
DARNIA
IMO 9336464
|
45,704 | 2017 |
8.0
|
C |
| 674 |
INFINITY AQUILA
IMO 9258600
|
47,122 | 2004 |
8.0
|
C |
| 673 |
SERENA M
IMO 9444508
|
39,710 | 2010 |
8.0
|
C |
| 676 |
CAROLINE
IMO 9262091
|
45,999 | 2002 |
8.0
|
C |
| 675 |
TRUST GALAXY
IMO 9860192
|
21,020 | 2019 |
8.0
|
C |
| 677 |
STOLT LARIX
IMO 9617650
|
30,297 | 2015 |
8.1
|
C |
| 679 |
CLEAN IMPERIAL
IMO 9376854
|
39,998 | 2009 |
8.1
|
C |
| 678 |
KAMUI GALAXY
IMO 9942653
|
26,400 | 2022 |
8.1
|
C |
| 681 |
NCC NASMA
IMO 9459008
|
45,550 | 2011 |
8.1
|
C |
| 680 |
PORTARIA
IMO 9464326
|
36,677 | 2010 |
8.1
|
C |
| 682 |
CHEM ORCHARD
IMO 9937983
|
33,354 | 2024 |
8.1
|
C |
| 684 |
STOLT FOCUS
IMO 9214305
|
37,467 | 2001 |
8.1
|
C |
| 683 |
NCC AMAL
IMO 9411317
|
45,544 | 2011 |
8.1
|
C |
| 686 |
TSUKUBA GALAXY
IMO 9796834
|
26,175 | 2020 |
8.1
|
C |
| 688 |
KRITI CAPTAIN
IMO 9335147
|
37,434 | 2007 |
8.1
|
C |
| 685 |
BOCHEM ROTTERDAM
IMO 9955478
|
26,599 | 2021 |
8.1
|
C |
| 687 |
SEA RUNNER
IMO 9442720
|
50,352 | 2006 |
8.1
|
C |
| 689 |
RAMELIA
IMO 9818280
|
17,994 | 2019 |
8.1
|
C |
| 691 |
HUANG SHAN 16
IMO 9967940
|
19,985 | 2023 |
8.1
|
C |
| 690 |
BOW PROSPER
IMO 9866770
|
36,222 | 2020 |
8.1
|
C |
| 693 |
STOLT COBALT
IMO 9739305
|
27,606 | 2016 |
8.1
|
C |
| 694 |
ECO REVOLUTION
IMO 9725598
|
39,208 | 2016 |
8.1
|
C |
| 692 |
GOLDEN PALM
IMO 1055882
|
18,420 | 2025 |
8.1
|
C |
| 698 |
METEORA
IMO 9322944
|
40,045 | 2009 |
8.1
|
C |
| 697 |
JKT MIRACLE
IMO 9278662
|
33,573 | 2004 |
8.1
|
C |
| 696 |
EASTERLY CANYON
IMO 9383974
|
36,677 | 2009 |
8.1
|
C |
| 695 |
CELESTE I
IMO 9250488
|
46,350 | 2003 |
8.1
|
C |
| 700 |
ZEVULUN
IMO 9405540
|
51,522 | 2010 |
8.1
|
C |
| 699 |
CAPIBARA
IMO 9267027
|
38,877 | 2004 |
8.1
|
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.