HomeCalculatorsABS ENVIRO / ENVIRO+ Notation

ABS ENVIRO / ENVIRO+ Notation

American Bureau of Shipping's environmental notation. ENVIRO covers MARPOL-plus operational compliance; ENVIRO+ adds advanced protections for air, water, and waste. Widely adopted on US-flag and cruise fleets.

ClassABS

ENVIRO requirements

Engine NOx ≥ Tier II + SCR or EGRFuel sulphur ≤ 0.10 % in ECA + ≤ 0.50 % globallyGarbage management plan + ship-to-shore receiptSewage Type-II MEPC.227(64) approved

ENVIRO+ additions

Black + grey water treatment + membrane bioreactorBio-degradable oils at all sea interfacesEmissions monitoring (CEMS) on main stackUnderwater radiated noise level below ABS UWN

ENVIRO baseline met

4/4

ENVIRO+ extras met

1/4

Eligibility

ENVIRO

Standard environmental notation

Formula, assumptions, and limits

ENVIRO = all four baseline items. ENVIRO+ = ENVIRO plus all four advanced items. Formal notation issued only after ABS surveyor audit and operational evidence. UWN (underwater radiated noise) is a recent addition (2022) driven by cruise and research-ship demand.