TonneMiles

Container ship · United Kingdom flag

MAERSK CHICAGO: CO₂ emissions 2018–2025

IMO 9332975 EU ETS8 reporting years

CO₂ reported 2025
9,568 t
Fuel burned
3,072 t
Distance
13,061 nm
Time at sea
743 h
Emitted at berth
0% of total
Share of year under way
8%

MAERSK CHICAGO against its type

It is one of 69 container ships here under the United Kingdom flag, 2.0% of the 3,495 on the register. The returns for 2018–2025 all give Norfolk as port of registry.

Its 9,568 t of CO₂ for 2025 is 42% below the median of 16,359 t among the 2,234 container ships on this register that reported for 2025. Per nautical mile it emitted 732.6 kg CO₂, 34% above the type median of 545.6 kg. It logged 743 hours at sea against a median of 3,155 hours for its type that year. 0.3% of its 2025 emissions were at berth; the median for container ships was 3.2%. Across 8 years with reported emissions, the highest was 2024 (62,283 t) and the lowest 2025 (9,568 t). Its efficiency percentile within the type went from 20 in 2018 to 33 in 2025 (lower is more efficient). Of the 5 comparable vessels listed below with a 2025 return, 5 reported a lower CO₂ per nautical mile than this vessel.

Emissions by year2018–2025

Year CO₂ (t) Fuel (t) Distance (nm) At sea (h) At berth (t) kg CO₂/nm EEOI Percentile
2025 9,568 3,072 13,061 743 32 732.6 10.5 33
2024 62,283 19,999 87,544 5,036 169 711.5 10.9 31
2023 34,107 10,951 57,060 3,626 167 597.7 9.2 19
2022 34,650 11,126 52,188 3,203 174 664.0 10.1 21
2021 37,071 11,902 56,057 3,336 222 661.3 10.8 25
2020 36,065 11,573 54,948 3,469 276 656.4 11.1 29
2019 37,592 12,069 55,325 3,229 330 679.5 10.6 23
2018 41,404 13,287 59,908 3,674 256 691.1 10.6 20

Vessel particulars

IMO number
9332975
Ship type
Container ship
Flag state
United Kingdom per EU MRV 2025
Port of registry
Norfolk MRV 2025
Technical efficiency (design)
EEDI (15.56 gCO₂/t·nm)
Verifier
AMERICAN BUREAU OF SHIPPING HELLENIC SINGLE MEMBER LIMITED LIABILITY COMPANY (ABS HELLENIC S.M. LTD), Greece
Accreditation
1083-2
Compliance document issued
2026-03-25
Compliance document expires
2027-06-30

Efficiency against its own type2025

Position 610 of 1,838 qualifying container ships by EEOI, at the 33rd percentile. The dashed line is the type median, 14.2; this vessel reported 10.5.

0255075100more efficientless efficientThis vessel: 33rd percentile, EEOI 10.5

EEOI divides emissions by transport work, which for this vessel and year was 909,528,517 tonne-miles over 13,061 nautical miles.

Reported CO₂ by year

2018: 41,404 t201841,4042019: 37,592 t20192020: 36,065 t20202021: 37,071 t20212022: 34,650 t20222023: 34,107 t20232024: 62,283 t20242025: 9,568 t20259,568

Reported CO₂ in 2025 was 76.9% lower than in 2018, for EU/EEA voyages only.

From 2024 to 2025, emissions fell 84.6% while distance sailed fell 85.1%and CO₂ per nautical mile rose 3.0%.That points mainly to how much the vessel sailed, rather than the other.

Where the 2025 emissions occurred

At berthAt berth: 32 t32Within EEA portsWithin EEA ports: 32 t32Voyages to an EEA portVoyages to an EEA port: 7,048 t7,048Voyages from an EEA portVoyages from an EEA port: 2,489 t2,489Laden voyagesLaden voyages: 9,537 t9,537

Methane, nitrous oxide and EU ETS2025

Total CO₂ equivalent
9,719 t
Methane (CH₄)
0.15 t
Nitrous oxide (N₂O)
0.55 t
Under EU ETS
4,800 t, 50% of total

Laden voyages2025

CO₂ on laden voyages
9,537 t, 100% of total
Fuel, laden
3,062 t
CO₂ per nm, laden
730.2 kg

The rest of the 2025 total was emitted on ballast legs or at berth.

Sources and how to read this

This page draws on 8 MRV reporting years, an efficiency ranking and 1 of 5 vessel particulars. Not found in the sources for this vessel: AIS movements in Norwegian waters, a name history, a licensed photograph, a sanctions listing and US port state inspections.

Empty means unreported, never zero. How EEOI, distance, percentiles and sister ships are handled is explained under reading a vessel page. Something wrong? See corrections.

Comparable vesselsnearest by tonnage, same type