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 |
|---|---|---|---|---|---|
| 51 |
SILVER CINDY
IMO 9682368
|
49,738 | 2014 |
4.8
|
A |
| 53 |
ARDMORE SEAWOLF
IMO 9708227
|
49,909 | 2015 |
4.8
|
A |
| 52 |
HAPPY LADY
IMO 9644225
|
51,853 | 2013 |
4.8
|
A |
| 54 |
NORD MIYABI
IMO 9894739
|
49,996 | 2022 |
4.8
|
A |
| 56 |
PICO BASILE
IMO 9776250
|
51,525 | 2016 |
4.9
|
A |
| 55 |
CASTOR
IMO 9864356
|
49,999 | 2019 |
4.9
|
A |
| 57 |
SOLAR TINE
IMO 9898527
|
49,343 | 2021 |
4.9
|
A |
| 58 |
NORD VOLANTE
IMO 9944144
|
50,378 | 2023 |
4.9
|
A |
| 59 |
ARDMORE SEALION
IMO 9708203
|
49,909 | 2015 |
4.9
|
A |
| 63 |
ELANDRA REDWOOD
IMO 9834337
|
49,999 | 2018 |
4.9
|
A |
| 62 |
ATLANTIC JOURNEY
IMO 9798935
|
49,999 | 2018 |
4.9
|
A |
| 61 |
STENA PRO PATRIA
IMO 9899727
|
49,990 | 2022 |
4.9
|
A |
| 60 |
NORD VALOROUS
IMO 9827059
|
50,550 | 2018 |
4.9
|
A |
| 64 |
ATLANTIC HARMONY
IMO 9797747
|
50,090 | 2015 |
4.9
|
A |
| 66 |
SOLAR SUSIE
IMO 9898515
|
49,360 | 2021 |
4.9
|
A |
| 65 |
ARDMORE ENGINEER
IMO 9654787
|
49,420 | 2014 |
4.9
|
A |
| 68 |
EUROCHAMPION
IMO 9895903
|
49,999 | 2021 |
4.9
|
A |
| 67 |
PS MILANO
IMO 9828144
|
49,999 | 2018 |
4.9
|
A |
| 70 |
MINERVA LEO
IMO 9723289
|
39,070 | 2015 |
4.9
|
A |
| 69 |
JESSIE GLORY
IMO 9952983
|
49,801 | 2021 |
4.9
|
A |
| 71 |
EUROSAILOR
IMO 9895915
|
49,999 | 2021 |
4.9
|
A |
| 72 |
FPMC 32
IMO 9831701
|
49,660 | 2019 |
4.9
|
A |
| 73 |
PACIFIC JADE
IMO 9867803
|
49,995 | 2020 |
4.9
|
A |
| 76 |
MARIA
IMO 9917828
|
55,202 | 2022 |
5.0
|
A |
| 75 |
HATAY
IMO 9354258
|
51,218 | 2005 |
5.0
|
A |
| 74 |
ARDMORE GIBRALTAR
IMO 9790373
|
49,999 | 2017 |
5.0
|
A |
| 77 |
PIS PRECIOUS
IMO 9689158
|
50,258 | 2013 |
5.0
|
A |
| 79 |
SEYMOUR SUN
IMO 9911501
|
49,999 | 2022 |
5.0
|
A |
| 78 |
PS HAMBURG
IMO 9657806
|
50,143 | 2016 |
5.0
|
A |
| 80 |
STENA IMPORTANT
IMO 9667497
|
49,731 | 2015 |
5.0
|
A |
| 82 |
SILVER ORLA
IMO 9682332
|
49,746 | 2014 |
5.0
|
A |
| 81 |
KATHERINE LADY
IMO 9916123
|
49,999 | 2022 |
5.0
|
A |
| 83 |
CLEAROCEAN MUSIC
IMO 9800192
|
49,703 | 2018 |
5.0
|
A |
| 85 |
TARANAKI SUN
IMO 9751406
|
49,994 | 2016 |
5.0
|
A |
| 84 |
CATHERINE GRACE
IMO 9724611
|
50,099 | 2016 |
5.0
|
A |
| 87 |
MRC SEDEF
IMO 9335032
|
45,951 | 2007 |
5.0
|
A |
| 86 |
HAFNIA CRUX
IMO 9461697
|
52,550 | 2012 |
5.0
|
A |
| 88 |
NORD MASTER
IMO 9941295
|
49,999 | 2022 |
5.0
|
A |
| 90 |
RAWAN
IMO 9845104
|
55,634 | 2020 |
5.0
|
A |
| 89 |
PACIFIC RUBY
IMO 9906881
|
50,299 | 2021 |
5.0
|
A |
| 93 |
POINT LISAS
IMO 9905162
|
49,996 | 2021 |
5.0
|
A |
| 92 |
ELANDRA OAK
IMO 9509449
|
49,999 | 2016 |
5.0
|
A |
| 91 |
LARGO ELEGANCE
IMO 9776470
|
50,118 | 2015 |
5.0
|
A |
| 94 |
CL CHARLOTTE BRONTE
IMO 9943310
|
49,347 | 2023 |
5.1
|
A |
| 95 |
CL JANE AUSTEN
IMO 9943308
|
49,328 | 2022 |
5.1
|
A |
| 96 |
HAFNIA DAISY
IMO 9709788
|
49,899 | 2016 |
5.1
|
A |
| 98 |
EUROTRADER
IMO 9895927
|
49,999 | 2021 |
5.1
|
A |
| 97 |
NORD MARINER
IMO 9941300
|
49,999 | 2023 |
5.1
|
A |
| 99 |
LORA
IMO 9917804
|
55,202 | 2022 |
5.1
|
A |
| 100 |
PM MONARCH
IMO 9365001
|
76,543 | 2007 |
5.1
|
A |
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.