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.
ENVIRO requirements
ENVIRO+ additions
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.