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 |
|---|---|---|---|---|---|
| 701 |
SEA CIRRUS
IMO 9724568
|
39,999 | 2017 |
8.1
|
C |
| 702 |
WAN CHENG
IMO 9234587
|
46,764 | 2002 |
8.2
|
C |
| 703 |
BOW TITANIUM
IMO 9777395
|
27,601 | 2018 |
8.2
|
C |
| 704 |
FUTURA
IMO 9293961
|
40,085 | 2006 |
8.2
|
C |
| 705 |
STENA CONVOY
IMO 9543110
|
49,999 | 2022 |
8.2
|
C |
| 706 |
NAVIG8 UNIVERSE
IMO 9489106
|
45,313 | 2013 |
8.2
|
C |
| 707 |
VALDARNO
IMO 9717503
|
39,208 | 2015 |
8.2
|
C |
| 708 |
STOLT ISLAND
IMO 9414058
|
43,593 | 2009 |
8.2
|
C |
| 709 |
SFL ARUBA
IMO 9919761
|
33,325 | 2022 |
8.2
|
C |
| 710 |
STOLT MAPLE
IMO 9764491
|
32,825 | 2017 |
8.2
|
C |
| 711 |
CIELO DI GAETA
IMO 9669653
|
39,990 | 2014 |
8.2
|
C |
| 712 |
OTTO H
IMO 9749374
|
25,161 | 2016 |
8.2
|
C |
| 713 |
MTM HAMBURG
IMO 9379844
|
20,564 | 2008 |
8.2
|
C |
| 714 |
STOLT VANGUARD
IMO 9274305
|
25,261 | 2004 |
8.2
|
C |
| 715 |
CONTI GREENLAND
IMO 9391397
|
37,599 | 2008 |
8.2
|
C |
| 716 |
MAC LONDON
IMO 9296872
|
19,999 | 2003 |
8.2
|
C |
| 717 |
ESTEEM SANGO
IMO 9900461
|
19,980 | 2021 |
8.3
|
C |
| 718 |
ATLAS
IMO 9538177
|
37,866 | 2014 |
8.3
|
C |
| 719 |
THUN VENERN
IMO 9739824
|
17,998 | 2018 |
8.3
|
C |
| 720 |
RED DIAMOND
IMO 9583665
|
51,034 | 2012 |
8.3
|
C |
| 721 |
CHERRY TONDA
IMO 9288942
|
40,218 | 2004 |
8.3
|
C |
| 722 |
STOLT VIRTUE
IMO 9274317
|
25,230 | 2004 |
8.3
|
C |
| 723 |
PRAGUE
IMO 9421324
|
49,999 | 2008 |
8.3
|
C |
| 724 |
BOW CAROLINE
IMO 9367554
|
33,609 | 2009 |
8.3
|
C |
| 725 |
EASTERLY LIME GALAXY
IMO 9380972
|
19,992 | 2008 |
8.3
|
C |
| 726 |
FAIRCHEM VALOR
IMO 9791195
|
22,292 | 2019 |
8.3
|
C |
| 727 |
LYCIA KA
IMO 9327384
|
37,039 | 2006 |
8.3
|
C |
| 728 |
CB BALTIC
IMO 9851701
|
37,874 | 2020 |
8.3
|
C |
| 729 |
CB ADRIATIC
IMO 9851696
|
37,836 | 2019 |
8.3
|
C |
| 730 |
CHEM STAR 1
IMO 9731731
|
27,125 | 2016 |
8.3
|
C |
| 731 |
BOW ARCHITECT
IMO 9319480
|
30,058 | 2005 |
8.3
|
C |
| 732 |
RED OPAL
IMO 9381512
|
40,099 | 2010 |
8.3
|
C |
| 733 |
ARGOLIS
IMO 9326524
|
40,083 | 2007 |
8.3
|
C |
| 734 |
SEA LA BELLE
IMO 9380374
|
49,995 | 2008 |
8.3
|
C |
| 735 |
GELIBOLU
IMO 9314832
|
37,311 | 2006 |
8.4
|
C |
| 736 |
GINGA ANGEL
IMO 9809394
|
25,245 | 2020 |
8.4
|
C |
| 737 |
CHEMROAD SEA
IMO 9565730
|
33,560 | 2011 |
8.4
|
C |
| 738 |
FENICUSA M
IMO 9381500
|
40,036 | 2008 |
8.4
|
C |
| 739 |
CB CARIBIC
IMO 9851713
|
37,822 | 2020 |
8.4
|
C |
| 740 |
NORDIC CALLAO
IMO 9796822
|
26,029 | 2019 |
8.4
|
C |
| 741 |
SUPER G
IMO 9418121
|
50,747 | 2010 |
8.4
|
C |
| 742 |
EK-RIVER
IMO 9808259
|
19,884 | 2018 |
8.4
|
C |
| 743 |
GINGA COPPER
IMO 9829758
|
25,183 | 2019 |
8.4
|
C |
| 744 |
SAGAMI
IMO 9379911
|
33,614 | 2008 |
8.4
|
C |
| 745 |
BOCHEM MUMBAI
IMO 9565637
|
33,636 | 2006 |
8.4
|
C |
| 746 |
HTM WARRIOR
IMO 9399911
|
50,576 | 2009 |
8.4
|
C |
| 747 |
GINGA LINGER
IMO 9893448
|
25,064 | 2021 |
8.5
|
C |
| 748 |
CAIFU CHAO
IMO 9725823
|
19,998 | 2015 |
8.5
|
C |
| 749 |
VELOS TOPAZ
IMO 9360441
|
39,808 | 2007 |
8.5
|
C |
| 750 |
MTM ROTTERDAM
IMO 9477567
|
21,144 | 2011 |
8.6
|
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.