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 |
|---|---|---|---|---|---|
| 951 |
CHEM ARGON
IMO 9716004
|
19,993 | 2016 |
10.2
|
D |
| 952 |
ORIONIS
IMO 9400370
|
19,935 | 2009 |
10.2
|
D |
| 953 |
KRITI ADMIRAL
IMO 9314870
|
37,266 | 2007 |
10.2
|
D |
| 954 |
ORIENTAL HIBISCUS
IMO 9908334
|
16,223 | 2021 |
10.2
|
D |
| 955 |
CAN KA
IMO 9312925
|
37,582 | 2006 |
10.2
|
D |
| 956 |
CLEAN SANCTUARY
IMO 9430260
|
46,121 | 2009 |
10.2
|
D |
| 957 |
CHEM SILICON
IMO 9829681
|
19,977 | 2018 |
10.2
|
D |
| 958 |
MAGIC STAR
IMO 9420253
|
38,423 | 2009 |
10.2
|
D |
| 959 |
CHEM MIA
IMO 9407093
|
19,702 | 2008 |
10.2
|
D |
| 960 |
ORCHID SYLT
IMO 9367413
|
21,209 | 2009 |
10.2
|
D |
| 961 |
TG LIBRA
IMO 9724099
|
19,822 | 2016 |
10.3
|
D |
| 962 |
SAEHAN NURIA
IMO 9577185
|
21,290 | 2010 |
10.3
|
D |
| 963 |
EVA RICHWAY
IMO 9986025
|
19,906 | 2024 |
10.3
|
D |
| 964 |
TERN LAND
IMO 9988994
|
15,023 | 2025 |
10.3
|
D |
| 965 |
STOLT CREATIVITY
IMO 9102095
|
37,271 | 1997 |
10.3
|
D |
| 966 |
ALFRED N
IMO 9749324
|
25,161 | 2016 |
10.3
|
D |
| 967 |
SH FREESIA
IMO 9505986
|
19,991 | 2011 |
10.3
|
D |
| 968 |
STROMBOLI M
IMO 9595137
|
37,583 | 2011 |
10.3
|
D |
| 969 |
TIVOLI PARK
IMO 9780536
|
19,994 | 2018 |
10.3
|
D |
| 970 |
HAZAR
IMO 9290830
|
37,270 | 2005 |
10.3
|
D |
| 971 |
WISDOM STAR
IMO 9278674
|
34,528 | 2003 |
10.3
|
D |
| 972 |
MARVEA
IMO 9301897
|
39,999 | 2006 |
10.3
|
D |
| 973 |
GINGA BOBCAT
IMO 9472737
|
25,954 | 2010 |
10.4
|
D |
| 974 |
AAPUS 11
IMO 9508158
|
19,814 | 2008 |
10.4
|
D |
| 975 |
FLOYEN
IMO 9749790
|
19,997 | 2016 |
10.4
|
D |
| 976 |
HTM SAMURAI
IMO 9595125
|
37,583 | 2011 |
10.4
|
D |
| 977 |
CHEM SINGAPORE
IMO 9705768
|
19,996 | 2015 |
10.4
|
D |
| 978 |
TERN SEA
IMO 9747974
|
14,878 | 2016 |
10.4
|
D |
| 979 |
THUN LIDKOPING
IMO 9828974
|
18,684 | 2019 |
10.4
|
D |
| 980 |
LOYAL
IMO 9345881
|
23,322 | 2006 |
10.4
|
D |
| 981 |
EAST COAST
IMO 9298703
|
37,515 | 2005 |
10.4
|
D |
| 982 |
MAGIC WAND
IMO 9379143
|
46,754 | 2008 |
10.5
|
D |
| 983 |
REINHOLD SCHULTE
IMO 9576789
|
25,583 | 2012 |
10.5
|
D |
| 984 |
INDIGO RAY
IMO 9716016
|
19,989 | 2016 |
10.5
|
D |
| 985 |
CHEM LITHIUM
IMO 9815252
|
19,981 | 2017 |
10.5
|
D |
| 986 |
DELPHI
IMO 9283796
|
37,432 | 2004 |
10.5
|
D |
| 987 |
LAVRAKI
IMO 9323077
|
20,811 | 2007 |
10.5
|
D |
| 988 |
MTM NORTH SOUND
IMO 9360946
|
19,874 | 2006 |
10.6
|
D |
| 989 |
EVA FUJI
IMO 9914242
|
19,891 | 2021 |
10.6
|
D |
| 990 |
VELOS RUBINI
IMO 9455052
|
36,677 | 2010 |
10.6
|
D |
| 991 |
THUN LIVERPOOL
IMO 9828998
|
18,684 | 2019 |
10.6
|
D |
| 992 |
ERDEK
IMO 9175767
|
10,307 | 1998 |
10.6
|
D |
| 993 |
RUDOLF SCHULTE
IMO 9576765
|
25,581 | 2011 |
10.6
|
D |
| 994 |
STOLT INSPIRATION
IMO 9102083
|
37,205 | 1997 |
10.6
|
D |
| 995 |
CHEM AMSTERDAM
IMO 9640138
|
19,801 | 2013 |
10.6
|
D |
| 996 |
BRONX
IMO 9391414
|
37,599 | 2008 |
10.6
|
D |
| 997 |
ATHENIAN HORIZON
IMO 1026635
|
18,340 | 2025 |
10.6
|
D |
| 998 |
SHAMROCK MERCURY
IMO 9477531
|
19,998 | 2010 |
10.6
|
D |
| 999 |
CHEMICAL FIGHTER
IMO 9900459
|
15,950 | 2020 |
10.6
|
D |
| 1000 |
PVT AZURA
IMO 9423683
|
19,937 | 2009 |
10.7
|
D |
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.