{"id":"AIBD-1133","title":"EPA finds that Earthview's BluBird sensor network meets its methane screening thresholds of 5, 10 and 15 kg per hour and approves it for compliance","summary":"EPA found that Earthview's BluBird network of methane sensors meets the 5, 10 and 15 kg/hr thresholds for periodic screening and approved it on 30 September 2025.","date_observed":"2025-09-30","date_basis":"source publication","date_precision":"day","benefit_status":"intended","source_collection":null,"source_entry":null,"account":"Earthview Corporation makes the BluBird Continuous Monitoring System. Each fixed node draws air over three metal oxide sensors and records wind, humidity and temperature. Cloud software judges whether an emission is present and estimates its location and size. Earthview's approved method says that a machine learning-based model for each sensor predicts its clean-air resistance. EPA's memo describes a \"digital twin\" that predicts the same baseline. Earthview applied on 3 February 2025, citing controlled releases at Colorado State University's METEC facility from February to April 2024. Earthview's analysis put the 90% probability of detection at about 2.4 kg/hr for single releases. EPA notes that this analysis weighted leak duration and gave a much lower figure than the facility's public reports. EPA found that the sensors would identify emissions of about 5 kg/hr within a reasonable time, subject to environmental factors. It approved the system for periodic screening on 30 September 2025. EPA accepted that field use will place fewer sensors than the tests did. Earthview's application cited field detections under 5 kg/hr at one upstream site. 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Earthview Corporation: Period Screening System, the BluBird alternative test method (MATM-015) as approved and posted by EPA, section 10.1 (Calibration).","title":"Earthview BluBird Alternative Test Method (MATM-015)","url":"https://www.epa.gov/system/files/documents/2025-09/earthview-formal-atm-10kg_hr-2025.08.29-508_ns-sd-for-pdf.pdf","written_by":"makers","quote":"This is combined with a machine learning-based model constructed for each sensor based on measured resistance and atmospheric conditions.","supports_benefit":false}]}},"provenance":{"kind":"legacy_record","basis":"Editorial assignment.","record_fields":["evidence"],"source_refs":[]},"review_state":"record_mapped","coverage":"partial"},"sources[].id":{"state":"value_present","value":{"kind":"identifiers","identifiers":["AIBD-1133-source-0001","AIBD-1133-source-0002","AIBD-1133-source-0003"],"role":"Existing evidence items, in their original order"},"provenance":{"kind":"curatorial","basis":"Editorial assignment.","record_fields":[],"source_refs":[]},"review_state":"record_mapped","coverage":"complete"},"sources[].language":{"state":"unresolved","provenance":{"kind":"curatorial","basis":"Editorial assignment.","record_fields":[],"source_refs":[]},"reason":"This is an explicit unresolved assignment: the sources on record do not settle this question.","review_state":"not_assessed","coverage":"partial"},"sources[].relationship":{"state":"value_present","value":{"kind":"record_fields","fields":{"evidence":[{"kind":"regulatory document","citation":"U.S. Environmental Protection Agency, Office of Air Quality Planning and Standards, Measurement Technology Group. 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Earthview Corporation: Period Screening System, the BluBird alternative test method (MATM-015) as approved and posted by EPA, section 10.1 (Calibration).","title":"Earthview BluBird Alternative Test Method (MATM-015)","url":"https://www.epa.gov/system/files/documents/2025-09/earthview-formal-atm-10kg_hr-2025.08.29-508_ns-sd-for-pdf.pdf","written_by":"makers","quote":"This is combined with a machine learning-based model constructed for each sensor based on measured resistance and atmospheric conditions.","supports_benefit":false}]}},"provenance":{"kind":"legacy_record","basis":"Editorial assignment.","record_fields":["evidence"],"source_refs":[]},"review_state":"record_mapped","coverage":"partial"},"sources[].upstream_sources":{"state":"unresolved","provenance":{"kind":"curatorial","basis":"Editorial assignment.","record_fields":[],"source_refs":[]},"reason":"This is an explicit unresolved assignment: the sources on record do not settle this question.","review_state":"not_assessed","coverage":"partial"},"strategic_assessments[]":{"state":"unresolved","review_state":"not_assessed","coverage":"partial","family":"strategic assessments"},"summary":{"state":"value_present","value":{"kind":"record_fields","fields":{"summary":"EPA found that Earthview's BluBird network of methane sensors meets the 5, 10 and 15 kg/hr thresholds for periodic screening and approved it on 30 September 2025.","account":"Earthview Corporation makes the BluBird Continuous Monitoring System. Each fixed node draws air over three metal oxide sensors and records wind, humidity and temperature. Cloud software judges whether an emission is present and estimates its location and size. Earthview's approved method says that a machine learning-based model for each sensor predicts its clean-air resistance. EPA's memo describes a \"digital twin\" that predicts the same baseline. Earthview applied on 3 February 2025, citing controlled releases at Colorado State University's METEC facility from February to April 2024. Earthview's analysis put the 90% probability of detection at about 2.4 kg/hr for single releases. EPA notes that this analysis weighted leak duration and gave a much lower figure than the facility's public reports. EPA found that the sensors would identify emissions of about 5 kg/hr within a reasonable time, subject to environmental factors. It approved the system for periodic screening on 30 September 2025. 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Each fixed node draws air over three metal oxide sensors and records wind, humidity and temperature. Cloud software judges whether an emission is present and estimates its location and size. Earthview's approved method says that a machine learning-based model for each sensor predicts its clean-air resistance. EPA's memo describes a \"digital twin\" that predicts the same baseline. Earthview applied on 3 February 2025, citing controlled releases at Colorado State University's METEC facility from February to April 2024. Earthview's analysis put the 90% probability of detection at about 2.4 kg/hr for single releases. EPA notes that this analysis weighted leak duration and gave a much lower figure than the facility's public reports. EPA found that the sensors would identify emissions of about 5 kg/hr within a reasonable time, subject to environmental factors. It approved the system for periodic screening on 30 September 2025. 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