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 |
|---|---|---|---|---|---|
| 353 |
MURMURE
IMO 9939618
|
49,999 | 2025 |
6.0
|
B |
| 352 |
CARTAGENA
IMO 9389318
|
46,923 | 2009 |
6.0
|
B |
| 351 |
NORD VALOROUS
IMO 9827059
|
50,550 | 2018 |
6.0
|
B |
| 354 |
SILVER CINDY
IMO 9682368
|
49,738 | 2014 |
6.0
|
B |
| 355 |
NAVIGATOR
IMO 9370719
|
37,946 | 2008 |
6.0
|
B |
| 356 |
PACIFIC PROSPERITY
IMO 9326926
|
46,017 | 2008 |
6.0
|
B |
| 359 |
GULF MUTTRAH
IMO 9381835
|
46,556 | 2009 |
6.0
|
B |
| 358 |
STENA IMAGINATION
IMO 9685463
|
49,689 | 2016 |
6.0
|
B |
| 357 |
YASA ORION
IMO 9888340
|
50,215 | 2021 |
6.0
|
B |
| 360 |
PYXIS KARTERIA
IMO 9596260
|
46,652 | 2013 |
6.1
|
B |
| 361 |
CHEMROAD SAKURA
IMO 9757967
|
35,688 | 2017 |
6.1
|
B |
| 362 |
SEA LA DONNA
IMO 9380532
|
47,128 | 2009 |
6.1
|
B |
| 364 |
THERESA TIGA
IMO 9919735
|
49,449 | 2023 |
6.1
|
B |
| 363 |
STOLT EBONY
IMO 9744908
|
32,786 | 2017 |
6.1
|
B |
| 367 |
HAFNIA AMBER
IMO 9714056
|
38,506 | 2015 |
6.1
|
B |
| 366 |
HIGH CHALLENGE
IMO 9740586
|
49,990 | 2017 |
6.1
|
B |
| 365 |
HARMONICS
IMO 9799680
|
37,258 | 2019 |
6.1
|
B |
| 370 |
HAFNIA AVENTURINE
IMO 9711547
|
38,506 | 2013 |
6.1
|
B |
| 369 |
HIGH WIND
IMO 9740574
|
49,990 | 2016 |
6.1
|
B |
| 368 |
MRC BELIZ
IMO 9335044
|
46,012 | 2007 |
6.1
|
B |
| 371 |
NAVIG8 GUARD
IMO 9833670
|
49,761 | 2019 |
6.1
|
B |
| 372 |
ARDMORE ENTERPRISE
IMO 9654555
|
49,452 | 2013 |
6.1
|
B |
| 373 |
NAVIG8 EXCEED
IMO 9973913
|
49,166 | 2024 |
6.1
|
B |
| 374 |
DORIC PIONEER
IMO 9637117
|
51,565 | 2013 |
6.1
|
B |
| 375 |
RUI FU SHENG
IMO 9379129
|
46,846 | 2007 |
6.1
|
B |
| 376 |
CL CHARLOTTE BRONTE
IMO 9943310
|
49,347 | 2023 |
6.1
|
B |
| 377 |
WECO AMELIE
IMO 9693812
|
49,708 | 2015 |
6.2
|
B |
| 380 |
CAPE TEES
IMO 9441180
|
73,731 | 2009 |
6.2
|
B |
| 379 |
EUROCHAMPION
IMO 9895903
|
49,999 | 2021 |
6.2
|
B |
| 378 |
ACACIA
IMO 9747352
|
49,999 | 2017 |
6.2
|
B |
| 381 |
THALE VICTORY
IMO 9365817
|
51,087 | 2006 |
6.2
|
B |
| 382 |
CHEMROAD HAWK
IMO 9790622
|
35,647 | 2019 |
6.2
|
B |
| 383 |
CHAMPION JULIE
IMO 9447756
|
51,561 | 2010 |
6.2
|
B |
| 384 |
SEAWAYS LILY
IMO 9354894
|
49,999 | 2008 |
6.2
|
B |
| 387 |
SEAWAYS STAR
IMO 9337523
|
49,999 | 2008 |
6.2
|
B |
| 386 |
TARANGER
IMO 9524762
|
45,372 | 2011 |
6.2
|
B |
| 385 |
ATLANTIC EAGLE
IMO 9332183
|
47,128 | 2007 |
6.2
|
B |
| 388 |
TORM SINGAPORE
IMO 9434230
|
49,999 | 2011 |
6.2
|
B |
| 389 |
HAFNIA AMESSI
IMO 9719745
|
38,506 | 2015 |
6.2
|
B |
| 391 |
HAFNIA AMMOLITE
IMO 9727534
|
38,506 | 2015 |
6.2
|
B |
| 390 |
NORD VALOUR
IMO 9985851
|
49,999 | 2025 |
6.2
|
B |
| 394 |
NCC REEM
IMO 9459034
|
45,498 | 2012 |
6.2
|
B |
| 393 |
ANTARES
IMO 9723019
|
37,867 | 2015 |
6.2
|
B |
| 392 |
ELKA DELPHI
IMO 9705902
|
49,990 | 2015 |
6.2
|
B |
| 396 |
DEE4 LARCH
IMO 9697909
|
49,737 | 2016 |
6.2
|
B |
| 397 |
SEAFRIEND
IMO 9629574
|
50,660 | 2013 |
6.2
|
B |
| 395 |
GREAT EPSILON
IMO 9873644
|
49,298 | 2020 |
6.2
|
B |
| 398 |
STENA PROGRESSIVE
IMO 9944649
|
49,990 | 2024 |
6.2
|
B |
| 399 |
HAPPY LADY
IMO 9644225
|
51,853 | 2013 |
6.2
|
B |
| 400 |
STOLT MAGNESIUM
IMO 9739317
|
27,605 | 2017 |
6.3
|
B |
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.