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 |
|---|---|---|---|---|---|
| 152 |
DEE4 LARCH
IMO 9697909
|
49,737 | 2016 |
5.4
|
A |
| 153 |
YASA ALBATROSS
IMO 9857212
|
50,215 | 2019 |
5.4
|
A |
| 151 |
SILVER ELEANOR
IMO 9692301
|
49,746 | 2015 |
5.4
|
A |
| 155 |
TORM DENISE
IMO 9702211
|
49,999 | 2015 |
5.4
|
A |
| 154 |
STENA IMPERATOR
IMO 9797383
|
49,690 | 2017 |
5.4
|
A |
| 156 |
SEAWAYS FRONTIER
IMO 9332303
|
49,999 | 2007 |
5.4
|
A |
| 158 |
GULF MUTTRAH
IMO 9381835
|
46,556 | 2009 |
5.4
|
A |
| 157 |
OPTIMUS
IMO 9835044
|
49,999 | 2019 |
5.4
|
A |
| 159 |
NORD HARMONY
IMO 9870719
|
50,494 | 2020 |
5.5
|
A |
| 160 |
AL AMERAT
IMO 9405851
|
51,022 | 2008 |
5.5
|
A |
| 161 |
HIGH LOYALTY
IMO 9681857
|
49,990 | 2015 |
5.5
|
A |
| 164 |
SOLAR LAI FONG
IMO 9907809
|
49,358 | 2021 |
5.5
|
A |
| 163 |
DANK SILVER
IMO 9718806
|
49,734 | 2016 |
5.5
|
A |
| 162 |
STI BROOKLYN
IMO 9706841
|
49,990 | 2015 |
5.5
|
A |
| 166 |
FATIMAH
IMO 9917830
|
55,202 | 2022 |
5.5
|
A |
| 165 |
PTI NILE
IMO 9747338
|
49,999 | 2014 |
5.5
|
A |
| 167 |
TORM DEBORAH
IMO 9683386
|
49,680 | 2015 |
5.5
|
A |
| 169 |
VELOS LEO
IMO 9381768
|
49,999 | 2008 |
5.5
|
A |
| 168 |
ECO YOSEMITE PARK
IMO 9877573
|
49,999 | 2020 |
5.5
|
A |
| 170 |
ELKA ELEFSIS
IMO 9705914
|
51,000 | 2015 |
5.5
|
A |
| 173 |
NAVIG8 GOAL
IMO 9853216
|
49,770 | 2019 |
5.5
|
A |
| 172 |
LARGO EVOLUTION
IMO 9687942
|
49,750 | 2015 |
5.5
|
A |
| 171 |
TORM DULCE
IMO 9682394
|
49,746 | 2014 |
5.5
|
A |
| 174 |
ARDMORE SEAHAWK
IMO 9708239
|
49,999 | 2015 |
5.5
|
A |
| 175 |
STENA IMPECCABLE
IMO 9693020
|
49,737 | 2017 |
5.5
|
A |
| 176 |
BASSET
IMO 9858060
|
49,875 | 2019 |
5.5
|
A |
| 179 |
ZANDOLIE
IMO 9893163
|
50,494 | 2021 |
5.5
|
A |
| 178 |
ECO LOS ANGELES
IMO 9877559
|
50,185 | 2020 |
5.5
|
A |
| 177 |
DRACO
IMO 9801562
|
50,067 | 2021 |
5.5
|
A |
| 181 |
YASA SWAN
IMO 9857248
|
50,215 | 2019 |
5.5
|
A |
| 180 |
CHASE OCEAN
IMO 9290660
|
46,959 | 2006 |
5.5
|
A |
| 182 |
ECO JOSHUA PARK
IMO 9877585
|
49,999 | 2020 |
5.5
|
A |
| 184 |
YASA PELICAN
IMO 9857224
|
50,215 | 2019 |
5.6
|
A |
| 186 |
ST HELEN
IMO 9934151
|
50,226 | 2022 |
5.6
|
A |
| 183 |
SEA LA BELLE
IMO 9380374
|
49,995 | 2008 |
5.6
|
A |
| 185 |
SEAPROMISE
IMO 9934125
|
50,394 | 2022 |
5.6
|
A |
| 190 |
PYXIS THETA
IMO 9657064
|
51,462 | 2013 |
5.6
|
A |
| 189 |
SOLAR RUO YUN
IMO 9907811
|
49,362 | 2021 |
5.6
|
A |
| 188 |
YASA HAWK
IMO 9619531
|
49,990 | 2017 |
5.6
|
A |
| 187 |
NORD ELEGANCE
IMO 9870707
|
50,415 | 2020 |
5.6
|
A |
| 192 |
PACIFIC JULIA
IMO 9772046
|
66,269 | 2017 |
5.6
|
A |
| 191 |
SEAWAYS GRACE
IMO 9337511
|
49,999 | 2008 |
5.6
|
A |
| 193 |
HAFNIA TOURMALINE
IMO 9753698
|
49,513 | 2014 |
5.6
|
A |
| 194 |
STI MIRACLE
IMO 9833591
|
49,999 | 2020 |
5.6
|
A |
| 196 |
CHEMROAD SIRIUS
IMO 9757979
|
35,757 | 2018 |
5.6
|
A |
| 197 |
AINAZI
IMO 9323405
|
52,606 | 2008 |
5.6
|
A |
| 195 |
ATLANTIC MARBLE
IMO 9798959
|
49,999 | 2018 |
5.6
|
A |
| 200 |
ELANDRA FJORD
IMO 9482550
|
51,408 | 2011 |
5.7
|
A |
| 199 |
RIVIERA
IMO 9384019
|
51,218 | 2008 |
5.7
|
A |
| 198 |
STI MARSHALL
IMO 9833565
|
49,999 | 2019 |
5.7
|
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.