{ "id": "AIBD-0091", "title": "UNEP MARS alert led to repair of a decades-old methane source at Hassi Messaoud, Algeria, verified by satellite from 15 October 2024", "summary": "MARS alert led an Algerian operator to fix an unlit flare at Hassi Messaoud; satellites show no emissions since 15 October 2024.", "date_observed": "2024-10-15", "date_basis": "unassessed", "date_precision": "unassessed", "benefit_status": null, "source_collection": null, "source_entry": null, "account": "UNEP's Methane Alert and Response System (MARS) combines data from more than 30 satellite instruments with expert analysis and AI models. It confirmed mitigation of a methane source at Hassi Messaoud, Algeria, in October 2024. UNEP's case document was issued in November 2024 per the repository record. The PDF's last-updated field reads 15 October 2024. It records a Landsat 5 detection dated 1 July 1987. It attributes the emissions to an unlit flare caused by a passing valve on the flare line. The operator corrected the valve and restored normal operations. UNEP states no further emissions have been detected at the location since 15 October 2024. UN News reported on 23 July 2026 that the Algerian alert led to the repair of a leak that had persisted for decades.", "category": "benefit created", "unexpected": false, "purpose": "Satellite-based detection and notification of major methane emission events to governments and operators to enable mitigation.", "system": "UNEP International Methane Emissions Observatory, Methane Alert and Response System (MARS)", "model_version": null, "developer": "UNEP International Methane Emissions Observatory (IMEO)", "deployer": "UNEP International Methane Emissions Observatory (notification); unnamed operator at Hassi Messaoud (repair)", "location": "Hassi Messaoud, Algeria", "domain": "Earth observation / methane emissions", "segment": "Oil and gas", "benefit_type": "Reduced Carbon Emissions", "taxonomy_note": null, "registry_ids": {}, "ratings": [ { "group": "personal", "depth": null, "reason": "No identifiable individuals are documented as affected by the repair." }, { "group": "organizational", "depth": 2, "reason": "The operator fixed a passing valve on a flare line and restored normal operations at one facility, per UNEP's case document." }, { "group": "societal", "depth": 3, "reason": "UN News describes the leak as having persisted for decades before the repair. Material to many, provisional pending independent quantification of the emissions avoided." } ], "ai_role": { "status": "assessed", "statement": "UNEP IMEO both developed and operates MARS (developer and deployer are the same body). UNEP's MARS page describes detection using more than 30 satellite instruments coupled with expertise and advanced AI models. The MARS FAQ says deep learning models monitor high-resolution satellite data for further emissions. The case document's boilerplate says MARS combines 30+ satellite instruments with expert analysis and AI models. None of these states which step in this case was AI-driven. The repair was carried out by the operator. The two case-document items are treated as a public body's official reports rather than vendor material." }, "evidence": [ { "kind": "case report", "citation": "UNEP IMEO (2024). Methane Alert and Response System (MARS) Confirmed Mitigation Action - Algeria (DZA_S_012). Repository Date Issued 2024-11 (month only; first day used); the PDF's LAST UPDATED field reads 15 October 2024.", "title": "MARS Confirmed Mitigation Action - Algeria (DZA_S_012)", "url": "https://wedocs.unep.org/bitstreams/5810b829-cf15-4eb0-b509-8dd489884a66/download", "date": "2024-11-01", "written_by": "makers", "quote": "No further emissions have been detected at the location since 15 October 2024." }, { "kind": "case report", "citation": "UNEP IMEO (2024). Methane Alert and Response System (MARS) Confirmed Mitigation Action - Algeria (DZA_S_012), repository record. Date Issued 2024-11 (month only; first day used).", "title": "MARS Confirmed Mitigation Action - Algeria (repository record)", "url": "https://wedocs.unep.org/items/33a43a3a-8a2a-4831-8f18-e09e472623b0", "date": "2024-11-01", "written_by": "makers", "quote": "In October 2024, at Algeria's Hassi Messaoud, the International Methane Emissions Observatory (IMEO) confirmed methane mitigation action through the Methane Alert and Response System (MARS)." }, { "kind": "news report", "citation": "UN News (2026). Satellites can now spot methane leaks in real time - but most go unfixed. 23 July 2026.", "title": "Satellites can now spot methane leaks in real time - but most go unfixed", "url": "https://news.un.org/en/story/2026/07/1168007", "date": "2026-07-23", "written_by": "makers", "quote": "In Algeria, one alert led to the repair of a leak that had persisted for decades" }, { "kind": "press release", "citation": "UNEP (n.d.). Methane Alert and Response System (MARS). UNEP topics page.", "title": "Methane Alert and Response System (MARS)", "url": "https://www.unep.org/topics/energy/methane/methane-alert-and-response-system-mars", "date": null, "written_by": "makers", "quote": "data from more than 30 satellite instruments, coupled with scientific expertise and advanced AI models" }, { "kind": "press release", "citation": "UNEP (n.d.). MARS Frequently Asked Questions. UNEP IMEO.", "title": "MARS Frequently Asked Questions", "url": "https://www.unep.org/en/what-we-do/energy/methane/international-methane-emissions-observatory/mars-frequently-asked", "date": null, "written_by": "makers", "quote": "MARS utilizes deep learning models to monitor data from continuously observing high-resolution satellites for future emissions from the region." }, { "kind": "report", "citation": "UNEP IMEO (2026). Methane Alert and Response System Snapshot: Top 50 Emitters, Country Responses and Mitigation, September 2026 Update (month only; first day used).", "title": "MARS Snapshot, September 2026 Update", "url": "https://methanedata.unep.org/downloads/top50_emitters/latest/mars_snapshot_latest.pdf", "date": "2026-09-01", "written_by": "makers", "quote": "To date, MARS has enabled and confirmed mitigation of over 40 major methane sources." }, { "kind": "report", "citation": "UNEP IMEO (2025). An Eye on Methane 2025: From Measurement to Momentum, repository abstract. Repository Date Issued 2025-10-03.", "title": "An Eye on Methane 2025: From Measurement to Momentum", "url": "https://wedocs.unep.org/bitstream/handle/20.500.11822/48664/An-Eye-on-Methane-2025.pdf?sequence=1&isAllowed=y", "date": "2025-10-03", "written_by": "makers", "quote": "the Methane Alert and Response System, which integrates satellite data and artificial intelligence to notify governments and companies of large emission events" } ], "replication": { "produced_by": [ "Satellite detection and expert quantification of a large point source, followed by a MARS notification to the government and operator", "An operator able to identify a simple equipment fault (passing valve on a flare line) and correct it", "Follow-up satellite monitoring confirming cessation" ], "must_hold": [ "A responsive focal point or operator. UN News reports only 13 percent of alerts lead to any response", "Verification depends on later satellite coverage. The Kazakhstan case shows emissions can recur after confirmed mitigation" ], "echoes": [ { "date": "2025-11-26", "setting": "Kazakhstan (KAZ_S_136, 43.39767°, 52.49505°; no place name given): gas pipeline leak first detected September 2025 (plume imaged by DLR's EnMAP 29 October 2025); operator transferred the gas flow to another pipeline, mitigation reported 26 November 2025; no further emissions detected since 12 March 2026 (document last updated 15 April 2026), but IMEO observed subsequent emissions at the location as of 21 May 2026", "model_version": null, "outcome": "recurred", "source": "https://wedocs.unep.org/bitstreams/558dda69-c8e5-42c2-b10a-7b9c3dcc3e79/download" }, { "date": "2023-12-01", "setting": "Argentina oil and gas facility: UNEP press release says the company fixed the leak after a MARS alert and satellite monitoring confirmed cessation", "model_version": null, "outcome": "recurred", "source": "https://www.unep.org/news-and-stories/press-release/uns-global-methane-tracking-system-set-translate-data-revolution" }, { "date": "2026-04-01", "setting": "Alberta, Canada: trade-press report of UNEP's monthly snapshot describing a 175-tonne-per-week plume fixed by repairing a failed ball valve on pigging equipment (month only; first day used)", "model_version": null, "outcome": "recurred", "source": "https://www.thechemicalengineer.com/news/canada-plugs-major-source-of-methane-emissions-from-oil-and-gas-field-leak/" } ] }, "paired_incident": null, "headline": "UNEP MARS alert leads to methane leak repair at Hassi Messaoud", "metric": null, "comparator": null, "later": { "status": "persisted", "date": "2026-07-23", "note": "Twenty-one months after the repair, UN News cited the Algerian case as a leak fixed after a MARS alert, while reporting that only 13 per cent of alerts receive a response.", "quote": "In Algeria, one alert led to the repair of a leak that had persisted for decades, delivering climate benefits comparable to removing half a million cars from the road each year.", "url": "https://news.un.org/en/story/2026/07/1168007" }, "value": null, "developer_country": "France", "deployer_country": "France", "unrated_because": null, "brief_notes": null, "brief": null, "revisions": [ { "date": "2026-10-20", "change": "Record drafted from the cited sources.", "source": null, "editor": "AIBD" }, { "date": "2026-10-20", "change": "Rewrote the Kazakhstan echo from the KAZ_S_136 document (no place name, first detection September 2025 with the EnMAP plume imaged 29 October 2025, no further emissions since 12 March 2026 until the 21 May 2026 banner), marked the month-only dates in the case-document and snapshot citations and dated the Eye on Methane item 2025-10-03 from its repository record, and stated that UNEP IMEO both developed and operates MARS so that the two case-document items count as a public body's official reports (marked independent).", "source": "https://wedocs.unep.org/bitstreams/558dda69-c8e5-42c2-b10a-7b9c3dcc3e79/download; https://wedocs.unep.org/bitstreams/5810b829-cf15-4eb0-b509-8dd489884a66/download; https://wedocs.unep.org/items/33a43a3a-8a2a-4831-8f18-e09e472623b0; https://wedocs.unep.org/handle/20.500.11822/48664", "editor": "AIBD" }, { "date": "2026-10-21", "change": "Added what happened since from the cited sources.", "source": "https://news.un.org/en/story/2026/07/1168007", "editor": "AIBD" }, { "date": "2026-10-21", "change": "Benefit type set to Reduced Carbon Emissions under Trustible's full taxonomy of 23 types; it was Improved Environmental Sustainability among the six first used.", "source": "https://trustible.ai/post/a-framework-for-measuring-the-benefits-of-ai/", "editor": "AIBD" }, { "date": "2026-10-21", "change": "Country of the developer and the deployer added from the organization's own site or a registry.", "source": "https://en.wikipedia.org/wiki/International_Methane_Emissions_Observatory; https://en.wikipedia.org/wiki/International_Methane_Emissions_Observatory", "editor": "AIBD" }, { "date": "2026-10-21", "change": "Prose pass: a rating reason, account, the replication conditions, the system's part rewritten in shorter sentences with abbreviations expanded; facts, figures and quotations unchanged.", "source": null, "editor": "AIBD" }, { "date": "2026-10-22", "change": "Organization name standardized to UNEP International Methane Emissions Observatory.", "source": null, "editor": "AIBD" } ], "confidence": "claimed", "shade": "low", "claim_status": "The makers' claim", "claim_basis": "Sources: two case reports from the makers, two reports from the makers, the makers' news report and two press releases from the makers. The cited evidence includes no independent source and no finding by a regulator or court.", "profile": { "case_id": "AIBD-0091", "catalog_version": "1.0.0", "source_fingerprint": "deb4f3b76031e7146e46b243baa8cbf4c5288f8921f9a2d91da88e1cf8cfbfc7", "collection_refs": [ { "collection_id": "aibd", "version": "snapshot-8bf7cfec9cb185aa" }, { "collection_id": "aibd", "version": "2026-10-25" }, { "collection_id": "viator", "version": "2026-10-25" }, { "collection_id": "chanticleer", "version": "2026-10-25" } ], "source_ids": [ "AIBD-0091-source-0001", "AIBD-0091-source-0002", "AIBD-0091-source-0003", "AIBD-0091-source-0004", "AIBD-0091-source-0005", "AIBD-0091-source-0006", "AIBD-0091-source-0007" ], "families": { "strategic assessments": { "state": "not_assessed", "review_state": "not_assessed", "coverage": "partial", "record_ids": [] }, "evaluations": { "state": "not_assessed", "review_state": "not_assessed", "coverage": "partial", "record_ids": [] }, "monetary observations": { "state": "not_assessed", "review_state": "not_assessed", "coverage": "partial", "record_ids": [] }, "institutional decisions": { "state": "not_assessed", "review_state": "not_assessed", "coverage": "partial", "record_ids": [] } }, "fields": { "actors[]": { "state": "value_present", "value": { "kind": "record_fields", "fields": { "developer": "UNEP International Methane Emissions Observatory (IMEO)", "deployer": "UNEP International Methane Emissions Observatory (notification); unnamed operator at Hassi Messaoud (repair)" } }, "provenance": { "kind": "legacy_record", "basis": "Preserved from the existing AIBD record; external sources were not rechecked.", "record_fields": [ "developer", "deployer" ], "source_refs": [] }, "review_state": "record_mapped", "coverage": "partial" }, "actors[].ownership_control": { "state": "not_assessed", "review_state": "not_assessed", "coverage": "partial" }, "ai_contribution": { "state": "value_present", "value": { "kind": "record_fields", "fields": { "ai_role": { "status": "assessed", "statement": "UNEP IMEO both developed and operates MARS (developer and deployer are the same body). UNEP's MARS page describes detection using more than 30 satellite instruments coupled with expertise and advanced AI models. The MARS FAQ says deep learning models monitor high-resolution satellite data for further emissions. The case document's boilerplate says MARS combines 30+ satellite instruments with expert analysis and AI models. None of these states which step in this case was AI-driven. The repair was carried out by the operator. The two case-document items are treated as a public body's official reports rather than vendor material." } } }, "provenance": { "kind": "legacy_record", "basis": "Preserved from the existing AIBD record; external sources were not rechecked.", "record_fields": [ "ai_role" ], "source_refs": [] }, "review_state": "record_mapped", "coverage": "partial" }, "ai_relationship": { "state": "value_present", "value": { "kind": "record_fields", "fields": { "category": "benefit created", "ai_role": { "status": "assessed", "statement": "UNEP IMEO both developed and operates MARS (developer and deployer are the same body). UNEP's MARS page describes detection using more than 30 satellite instruments coupled with expertise and advanced AI models. The MARS FAQ says deep learning models monitor high-resolution satellite data for further emissions. The case document's boilerplate says MARS combines 30+ satellite instruments with expert analysis and AI models. None of these states which step in this case was AI-driven. The repair was carried out by the operator. The two case-document items are treated as a public body's official reports rather than vendor material." } } }, "provenance": { "kind": "legacy_record", "basis": "Preserved from the existing AIBD record; external sources were not rechecked.", "record_fields": [ "ai_role", "category" ], "source_refs": [] }, "review_state": "record_mapped", "coverage": "partial" }, "assessments[].alternatives": { "state": "not_assessed", "review_state": "not_assessed", "coverage": "partial" }, "assessments[].assessor_date": { "state": "not_assessed", "review_state": "not_assessed", "coverage": "partial" }, "assessments[].depth": { "state": "value_present", "value": { "kind": "record_fields", "fields": { "ratings": [ { "group": "personal", "reason": "No identifiable individuals are documented as affected by the repair." }, { "group": "organizational", "depth": 2, "reason": "The operator fixed a passing valve on a flare line and restored normal operations at one facility, per UNEP's case document." }, { "group": "societal", "depth": 3, "reason": "UN News describes the leak as having persisted for decades before the repair. Material to many, provisional pending independent quantification of the emissions avoided." } ] } }, "provenance": { "kind": "legacy_record", "basis": "Preserved from the existing AIBD record; external sources were not rechecked.", "record_fields": [ "ratings" ], "source_refs": [] }, "review_state": "record_mapped", "coverage": "partial" }, "assessments[].display_confidence": { "state": "value_present", "value": { "kind": "structured", "data": { "confidence": "low", "evidence_word": "claimed", "claim_status": "The makers' claim", "basis": "Sources: two case reports from the makers, two reports from the makers, the makers' news report and two press releases from the makers. 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It confirmed mitigation of a methane source at Hassi Messaoud, Algeria, in October 2024. UNEP's case document was issued in November 2024 per the repository record. The PDF's last-updated field reads 15 October 2024. It records a Landsat 5 detection dated 1 July 1987. It attributes the emissions to an unlit flare caused by a passing valve on the flare line. The operator corrected the valve and restored normal operations. UNEP states no further emissions have been detected at the location since 15 October 2024. 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It confirmed mitigation of a methane source at Hassi Messaoud, Algeria, in October 2024. UNEP's case document was issued in November 2024 per the repository record. The PDF's last-updated field reads 15 October 2024. It records a Landsat 5 detection dated 1 July 1987. It attributes the emissions to an unlit flare caused by a passing valve on the flare line. The operator corrected the valve and restored normal operations. UNEP states no further emissions have been detected at the location since 15 October 2024. UN News reported on 23 July 2026 that the Algerian alert led to the repair of a leak that had persisted for decades." } }, "provenance": { "kind": "legacy_record", "basis": "Preserved from the existing AIBD record; external sources were not rechecked.", "record_fields": [ "summary", "account" ], "source_refs": [] }, "review_state": "record_mapped", "coverage": "partial" }, "systems[].autonomy_permissions": { "state": "not_assessed", "review_state": "not_assessed", "coverage": "partial" }, "systems[].component_role": { "state": "not_assessed", "review_state": "not_assessed", "coverage": "partial" }, "systems[].deployment_configuration": { "state": "not_assessed", "review_state": "not_assessed", "coverage": "partial" }, "systems[].inputs_outputs": { "state": "not_assessed", "review_state": "not_assessed", "coverage": "partial" }, "systems[].model_name": { "state": "not_assessed", "review_state": "not_assessed", "coverage": "partial" }, "systems[].model_version": { "state": "not_assessed", "review_state": "not_assessed", "coverage": "partial" }, "systems[].product_name": { "state": "value_present", "value": { "kind": "record_fields", "fields": { "system": "UNEP International Methane Emissions Observatory, Methane Alert and Response System (MARS)" } }, "provenance": { "kind": "legacy_record", "basis": "Preserved from the existing AIBD record; external sources were not rechecked.", "record_fields": [ "system" ], "source_refs": [] }, "review_state": "record_mapped", "coverage": "partial" }, "systems[].provider": { "state": "value_present", "value": { "kind": "structured", "data": { "application_developer": "UNEP International Methane Emissions Observatory (IMEO)" } }, "provenance": { "kind": "legacy_record", "basis": "Mapped from the existing case description without a new external source review.", "record_fields": [ "developer" ], "source_refs": [] }, "review_state": "record_mapped", "coverage": "partial" }, "taxonomy_crosswalks[]": { "state": "not_assessed", "review_state": "not_assessed", "coverage": "partial" }, "title": { "state": "value_present", "value": { "kind": "record_fields", "fields": { "title": "UNEP MARS alert led to repair of a decades-old methane source at Hassi Messaoud, Algeria, verified by satellite from 15 October 2024", "headline": "UNEP MARS alert leads to methane leak repair at Hassi Messaoud" } }, "provenance": { "kind": "legacy_record", "basis": "Preserved from the existing AIBD record; external sources were not rechecked.", "record_fields": [ "title", "headline" ], "source_refs": [] }, "review_state": "record_mapped", "coverage": "partial" }, "version": { "state": "value_present", "value": { "kind": "identifiers", "identifiers": [ "deb4f3b76031e7146e46b243baa8cbf4c5288f8921f9a2d91da88e1cf8cfbfc7" ], "role": "SHA-256 of normalized original case data" }, "provenance": { "kind": "curatorial", "basis": "Deterministic content version assigned by the local migration.", "record_fields": [], "source_refs": [] }, "review_state": "record_mapped", "coverage": "complete" }, "workflow": { "state": "value_present", "value": { "kind": "record_fields", "fields": { "account": "UNEP's Methane Alert and Response System (MARS) combines data from more than 30 satellite instruments with expert analysis and AI models. It confirmed mitigation of a methane source at Hassi Messaoud, Algeria, in October 2024. UNEP's case document was issued in November 2024 per the repository record. The PDF's last-updated field reads 15 October 2024. It records a Landsat 5 detection dated 1 July 1987. It attributes the emissions to an unlit flare caused by a passing valve on the flare line. The operator corrected the valve and restored normal operations. UNEP states no further emissions have been detected at the location since 15 October 2024. UN News reported on 23 July 2026 that the Algerian alert led to the repair of a leak that had persisted for decades.", "replication": { "produced_by": [ "Satellite detection and expert quantification of a large point source, followed by a MARS notification to the government and operator", "An operator able to identify a simple equipment fault (passing valve on a flare line) and correct it", "Follow-up satellite monitoring confirming cessation" ], "must_hold": [ "A responsive focal point or operator. UN News reports only 13 percent of alerts lead to any response", "Verification depends on later satellite coverage. The Kazakhstan case shows emissions can recur after confirmed mitigation" ], "echoes": [ { "date": "2025-11-26", "setting": "Kazakhstan (KAZ_S_136, 43.39767°, 52.49505°; no place name given): gas pipeline leak first detected September 2025 (plume imaged by DLR's EnMAP 29 October 2025); operator transferred the gas flow to another pipeline, mitigation reported 26 November 2025; no further emissions detected since 12 March 2026 (document last updated 15 April 2026), but IMEO observed subsequent emissions at the location as of 21 May 2026", "outcome": "recurred", "source": "https://wedocs.unep.org/bitstreams/558dda69-c8e5-42c2-b10a-7b9c3dcc3e79/download" }, { "date": "2023-12-01", "setting": "Argentina oil and gas facility: UNEP press release says the company fixed the leak after a MARS alert and satellite monitoring confirmed cessation", "outcome": "recurred", "source": "https://www.unep.org/news-and-stories/press-release/uns-global-methane-tracking-system-set-translate-data-revolution" }, { "date": "2026-04-01", "setting": "Alberta, Canada: trade-press report of UNEP's monthly snapshot describing a 175-tonne-per-week plume fixed by repairing a failed ball valve on pigging equipment (month only; first day used)", "outcome": "recurred", "source": "https://www.thechemicalengineer.com/news/canada-plugs-major-source-of-methane-emissions-from-oil-and-gas-field-leak/" } ] } } }, "provenance": { "kind": "legacy_record", "basis": "Preserved from the existing AIBD record; external sources were not rechecked.", "record_fields": [ "account", "replication" ], "source_refs": [] }, "review_state": "record_mapped", "coverage": "partial" } }, "summary": { "total": 91, "addressed": 91, "known": 29, "reviewed": 0, "record_mapped": 29, "not_assessed": 62, "complete": false, "by_state": { "value_present": 29, "not_reported": 0, "unresolved": 0, "not_assessed": 62, "not_applicable": 0, "withheld": 0, "source_unavailable": 0 } } } }