Emissions to the ocean realm of MARPOL-regulated harmful substances
Measurement answer
What this metric measures
Reports the total volume of harmful substances emitted to the ocean realm that are regulated under MARPOL Annexes I-III.
Specification
Metric specification
- Result format
- Single value
- Unit
- m³ — source-defined reporting unit
- Reporting basis
- Reporting period
- Aggregation
- Sum of volumes of covered harmful-substance emissions to the ocean realm during the reporting period
- Pillar
- Environmental
- Topic
- Pollution
- Controlled domain
- Pollution
- Entity type
- Metric
Reporting boundary
Emissions to the ocean realm of harmful substances regulated under MARPOL Annex I (oil), Annex II (noxious liquid substances) and Annex III (harmful substances in packaged form).
Verified source occurrences
Framework coverage
This is one canonical metric. The bindings below show every verified framework occurrence without creating duplicate metric pages. Edition, disclosure, role, and relationship remain source-specific.
- Adopting DisclosureSource evidence
TNFD sector guidance
- Publisher
- Taskforce on Nature-related Financial Disclosures
- Edition
- Final English sector guidance collection through August 2026 (17 documents)
- Requirement
- Not Specified
- Relationship
- Defines Disclosure
- Mapping outcome
- Direct Evidence
- Source locator
- TNFD sector guidance, p. 71, Section 3.2, Table 15, metric code MT.C2.1 | p. 71, Section 3.2, Table 15, MT.C2.1
- Adopting DisclosureMT.C2.1
TNFD sector guidance
- Publisher
- Taskforce on Nature-related Financial Disclosures
- Edition
- Version 1.0, June 2025
- Requirement
- Conditional
- Relationship
- Maps Source Identity
- Mapping outcome
- Published
- Source locator
- p. 71, Section 3.2, Table 15, MT.C2.1
Value structure
Dimensions and units
- Unit
- m³ — source-defined reporting unit
- Reporting basis
- Reporting period
Unit meaning: Values use m³ under the disclosed TNFD sector-guidance method, reporting period and boundary.
Published dimensions
- MARPOL annex category: Annex I, Annex II or Annex III
- Harmful-substance category or substance, where separately tracked
Calculation method
Formula information
- Status
- Specified
- Formula type
- Sum
Formula
V_ocean = Σ_i v_iApply the source-defined TNFD sector-guidance method within the stated reporting boundary. The source specifies a standalone, quantitatively reportable environmental outcome with an explicit volume unit and a defined substance boundary. It is not the same construct as generic emissions-to-water metrics because its receiving realm and MARPOL Annex I-III coverage are specific. The metric can be reported as a scalar total while retaining Annex and substance categories as supporting dimensions.
Variables
| Symbol | Variable | Definition | Unit |
|---|---|---|---|
V_ocean | Total volume of covered emissions to the ocean realm | Total reporting-period volume of harmful-substance emissions to the ocean realm within the MARPOL Annex I-III boundary. | m³ |
v_i | Volume of covered emission i | Volume of an individual covered harmful-substance emission to the ocean realm. | m³ |
Verified sources
Evidence and status sources
Sustopedia checked each record-specific claim directly against primary publisher material. Labels distinguish current measurement authority from future compatibility and corroborative, legal, edition, or method status context. Corroborative evidence can support a stated limitation but cannot establish the core measurement by itself.
Measurement evidence
- Measurement evidenceChecked 30 August 2026
TNFD additional sector guidance collection
- Publisher
- Taskforce on Nature-related Financial Disclosures
- Edition
- Final English sector guidance collection through August 2026 (17 documents)
- Locator
- TNFD sector guidance, p. 71, Section 3.2, Table 15, metric code MT.C2.1 | p. 71, Section 3.2, Table 15, MT.C2.1
Supports: The official TNFD sector guidance supports the identity, boundary and method basis of “Emissions to the ocean realm of MARPOL-regulated harmful substances”.
Open official source
Use with context
Interpretation boundaries
Method disclosures required
Source-edition basis: TNFD sector guidance, Final English sector guidance collection through August 2026 (17 documents).
- Identify the MARPOL Annex I-III categories and harmful substances included.
- Disclose the approach used to identify, measure or estimate emissions to the ocean realm.
- Disclose whether reported volumes are measured, estimated or derived from operational records.
- Disclose any exclusions from the stated MARPOL-regulated harmful-substance boundary.
Record-specific limitations
- Covers only harmful substances within the stated MARPOL Annex I-III boundary.
- Reports volume and does not represent toxicity, ecological impact, concentration or pollutant mass.
- Comparability depends on the organization’s identification, measurement or estimation of covered ocean emissions.
Interpret this metric with the stated reporting boundary, period convention, value shape, and unit. Results prepared with different boundaries or conventions may not be directly comparable.
Measurement evidence supports the core record-specific claims described above. Corroborative evidence can support limitations, while compatibility and status sources provide their separately labelled context. None of these cards by itself determines an organisation's legal applicability, filing readiness, assurance status, or compliance conclusion.