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 |
|---|---|---|---|---|---|
| 251 |
BOW LIND
IMO 9388314
|
46,047 | 2011 |
5.9
|
A |
| 252 |
NAVIG8 EXPRESS
IMO 9976874
|
49,153 | 2024 |
5.9
|
A |
| 255 |
OLAF
IMO 9434204
|
49,999 | 2010 |
5.9
|
A |
| 254 |
SILVER VENUS
IMO 9692375
|
49,635 | 2015 |
5.9
|
A |
| 253 |
MERAPI
IMO 9430167
|
46,872 | 2006 |
5.9
|
A |
| 256 |
THALE VICTORY
IMO 9365817
|
51,087 | 2006 |
6.0
|
A |
| 257 |
NAVIG8 GLADIATOR
IMO 9853230
|
49,762 | 2019 |
6.0
|
A |
| 260 |
THERESA TIGA
IMO 9919735
|
49,449 | 2023 |
6.0
|
A |
| 259 |
SAN MARCOS
IMO 9425540
|
50,120 | 2010 |
6.0
|
A |
| 258 |
VIRGO
IMO 9417218
|
49,999 | 2010 |
6.0
|
A |
| 261 |
SEAWAYS LILY
IMO 9354894
|
49,999 | 2008 |
6.0
|
A |
| 262 |
ARDMORE EXPORTER
IMO 9654775
|
49,526 | 2014 |
6.0
|
A |
| 263 |
ANATOLIA
IMO 9388003
|
46,583 | 2008 |
6.0
|
A |
| 266 |
MARLEN
IMO 9430179
|
46,829 | 2009 |
6.0
|
A |
| 265 |
KARDIANI
IMO 9366263
|
51,527 | 2005 |
6.0
|
A |
| 264 |
NAVIG8 GUIDE
IMO 9833682
|
49,761 | 2019 |
6.0
|
A |
| 267 |
ROYAL JASMINE
IMO 9375604
|
53,148 | 2008 |
6.0
|
A |
| 268 |
MONA
IMO 9917880
|
55,202 | 2022 |
6.0
|
A |
| 269 |
ELANDRA SEA
IMO 9635779
|
49,999 | 2013 |
6.0
|
A |
| 270 |
GREAT LAMDA
IMO 9873668
|
49,282 | 2020 |
6.0
|
A |
| 271 |
ATHINA M
IMO 9644237
|
51,853 | 2011 |
6.0
|
A |
| 274 |
MTM KEY WEST
IMO 9790672
|
35,894 | 2020 |
6.0
|
B |
| 273 |
MTM NEW ORLEANS
IMO 9749398
|
35,980 | 2016 |
6.0
|
B |
| 272 |
THERESA EMPAT
IMO 9931173
|
49,448 | 2023 |
6.0
|
B |
| 275 |
SEAWAYS MIA
IMO 9391426
|
49,999 | 2008 |
6.0
|
B |
| 276 |
SEAWAYS MUSE
IMO 9374301
|
51,498 | 2009 |
6.1
|
B |
| 277 |
HAFNIA AZURITE
IMO 9727560
|
38,506 | 2013 |
6.1
|
B |
| 278 |
HAFNIA LUPUS
IMO 9461685
|
49,999 | 2012 |
6.1
|
B |
| 280 |
BOW SPRING
IMO 9215256
|
49,429 | 2004 |
6.1
|
B |
| 279 |
THERESA DUA
IMO 9919723
|
49,449 | 2023 |
6.1
|
B |
| 281 |
MARITIME POLARIS
IMO 9768746
|
49,996 | 2017 |
6.1
|
B |
| 282 |
KINAROS
IMO 9405538
|
51,601 | 2009 |
6.1
|
B |
| 284 |
HAFNIA ACHROITE
IMO 9727584
|
38,506 | 2016 |
6.1
|
B |
| 283 |
STENA IMMORTAL
IMO 9685475
|
49,647 | 2016 |
6.1
|
B |
| 285 |
AVENCA
IMO 9410002
|
51,237 | 2008 |
6.1
|
B |
| 286 |
NORD HIMALAYA
IMO 9540807
|
49,936 | 2011 |
6.1
|
B |
| 287 |
SEAWAYS ROSE
IMO 9354911
|
49,999 | 2008 |
6.1
|
B |
| 288 |
LEONORA VICTORY
IMO 9283784
|
46,889 | 2005 |
6.1
|
B |
| 290 |
AFOVOS
IMO 9428346
|
49,999 | 2009 |
6.2
|
B |
| 289 |
DALMACIJA
IMO 9528134
|
49,991 | 2015 |
6.2
|
B |
| 292 |
GEMMA
IMO 9808314
|
40,019 | 2018 |
6.2
|
B |
| 291 |
HAFNIA TAURUS
IMO 9461673
|
49,999 | 2011 |
6.2
|
B |
| 293 |
BOXER
IMO 9814193
|
49,852 | 2019 |
6.2
|
B |
| 295 |
PACIFIC SARAH
IMO 9772034
|
74,242 | 2017 |
6.2
|
B |
| 294 |
MAYARO
IMO 9733703
|
30,940 | 2015 |
6.2
|
B |
| 296 |
STENA IMPERIAL
IMO 9667485
|
49,750 | 2015 |
6.2
|
B |
| 297 |
MRC BELIZ
IMO 9335044
|
46,012 | 2007 |
6.2
|
B |
| 300 |
CIELO DI NEW YORK
IMO 9669665
|
39,990 | 2014 |
6.2
|
B |
| 299 |
LADYBUG
IMO 9391385
|
37,527 | 2008 |
6.2
|
B |
| 298 |
KRITI RUBY
IMO 9391282
|
50,349 | 2008 |
6.2
|
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.