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 2024. 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 |
|---|---|---|---|---|---|
| 402 |
CHAMPION STAR
IMO 9258612
|
47,171 | 2004 |
6.8
|
B |
| 401 |
DIVA
IMO 9760548
|
37,296 | 2017 |
6.8
|
B |
| 403 |
KIZOMBA
IMO 9433901
|
51,747 | 2009 |
6.8
|
B |
| 404 |
BOCHEM NEW ORLEANS
IMO 9973303
|
25,000 | 2024 |
6.8
|
B |
| 405 |
HAFNIA ALABASTER
IMO 9727572
|
38,506 | 2015 |
6.8
|
B |
| 406 |
NAVIG8 EXCEED
IMO 9973913
|
49,166 | 2024 |
6.8
|
B |
| 408 |
VELEBIT
IMO 9455741
|
49,999 | 2011 |
6.8
|
B |
| 407 |
ROLLS I
IMO 9296119
|
40,952 | 2005 |
6.8
|
B |
| 409 |
OCEAN THALIA
IMO 9278052
|
51,319 | 2004 |
6.8
|
B |
| 412 |
BLOSSOM GLORY
IMO 9362372
|
50,605 | 2007 |
6.8
|
B |
| 411 |
ESENTEPE
IMO 9247508
|
40,250 | 2004 |
6.8
|
B |
| 410 |
DIADEMA
IMO 9808326
|
40,072 | 2018 |
6.8
|
B |
| 413 |
ARPEGGIO
IMO 9749441
|
35,103 | 2017 |
6.9
|
B |
| 414 |
SC DRACO
IMO 9752022
|
40,924 | 2016 |
6.9
|
B |
| 415 |
CORDOBA
IMO 9379131
|
46,763 | 2007 |
6.9
|
B |
| 418 |
DDELPHINUS 12
IMO 9359375
|
46,011 | 2010 |
6.9
|
B |
| 417 |
BOW SAGA
IMO 9215309
|
49,559 | 2007 |
6.9
|
B |
| 416 |
MAETIGA
IMO 9386861
|
46,925 | 2009 |
6.9
|
B |
| 419 |
STOLT STRENGTH
IMO 9311024
|
33,929 | 2005 |
6.9
|
B |
| 420 |
SC TAURUS
IMO 9801081
|
40,962 | 2017 |
6.9
|
B |
| 421 |
CAROLE M
IMO 9732797
|
37,596 | 2016 |
6.9
|
B |
| 422 |
TAMIAT NAVIGATOR
IMO 9422237
|
46,625 | 2006 |
6.9
|
B |
| 423 |
BOW OLYMPUS
IMO 9818527
|
48,555 | 2019 |
6.9
|
B |
| 424 |
CONCERTO
IMO 9743837
|
37,350 | 2017 |
6.9
|
B |
| 425 |
SEA CIRRUS
IMO 9724568
|
39,999 | 2017 |
6.9
|
B |
| 427 |
JAZZ
IMO 9804849
|
37,361 | 2019 |
7.0
|
B |
| 426 |
EVGENIA S
IMO 9388015
|
46,609 | 2008 |
7.0
|
B |
| 428 |
BOW OPTIMA
IMO 9818541
|
49,042 | 2020 |
7.0
|
B |
| 430 |
NCC NASMA
IMO 9459008
|
45,550 | 2011 |
7.0
|
B |
| 429 |
NORDIC COPENHAGEN
IMO 9796810
|
26,024 | 2019 |
7.0
|
B |
| 433 |
FJELLANGER
IMO 9387724
|
46,287 | 2010 |
7.0
|
B |
| 432 |
BOW SUN
IMO 9197284
|
49,466 | 2003 |
7.0
|
B |
| 431 |
ALPINE MARINA
IMO 9451692
|
46,162 | 2010 |
7.0
|
B |
| 435 |
CHEMROAD SAKURA
IMO 9757967
|
35,688 | 2017 |
7.0
|
B |
| 434 |
STOLT MAGNESIUM
IMO 9739317
|
27,605 | 2017 |
7.0
|
B |
| 436 |
LINUS P
IMO 9749350
|
32,247 | 2014 |
7.0
|
B |
| 437 |
COURAGE
IMO 9335056
|
45,965 | 2008 |
7.0
|
B |
| 438 |
LYCIA KA
IMO 9327384
|
37,039 | 2006 |
7.0
|
B |
| 440 |
MARITIME GISELA
IMO 9221011
|
44,419 | 2001 |
7.0
|
B |
| 439 |
NOCTURNE
IMO 9804863
|
37,245 | 2020 |
7.0
|
B |
| 441 |
PIGEON POINT
IMO 9322396
|
48,356 | 2005 |
7.0
|
B |
| 444 |
SEYCHELLES PRELUDE
IMO 9365623
|
45,680 | 2007 |
7.0
|
B |
| 443 |
HAFNIA AVENTURINE
IMO 9711547
|
38,506 | 2013 |
7.0
|
B |
| 442 |
BOW CAROLINE
IMO 9367554
|
33,609 | 2009 |
7.0
|
B |
| 445 |
BULL SHARK
IMO 9391440
|
49,999 | 2009 |
7.1
|
B |
| 446 |
AQUADISIAC
IMO 9396713
|
50,695 | 2008 |
7.1
|
B |
| 447 |
BOW PERFORMER
IMO 9790658
|
35,118 | 2019 |
7.1
|
B |
| 449 |
AKTI A
IMO 9935569
|
39,847 | 2022 |
7.1
|
B |
| 448 |
CHEM SAIPH
IMO 9731781
|
37,596 | 2017 |
7.1
|
B |
| 450 |
BOW FAGUS
IMO 9047764
|
37,375 | 1995 |
7.1
|
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 2024 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.