{"hq_id":"hq-c-org-000040","name":"Carbon tetrachloride","context":"human_adult","timestamp":"2026-10-27T20:53:46.113Z","derived_by":{"label":"ALETHEIA-derived","engine":{"commit":"a1c6e861599cc34c5db0318ea1a7ac13a327e074","commit_source":"vercel_env","tree_clean":null},"params":{"sha256":"88ae43137e58ed0cd65588409efefee0d90253da01ef4459bf9ee25f888ec9a0","files":["axes.json","context-specificity.json","regulatory-mappings.json","synthesis-params.json","thresholds.json"]},"clock":{"year":2026},"inputs":[{"id":"hq-c-org-000040","sha256":"9425d55ec5816f194b865ad481294905e6235e641e7d73fa66ceb564072663c4"}]},"risk_level":"high","risk_profile":{"magnitude":{"mean":0.65903,"weightedMean":0.65903,"std_dev":0.106693,"confidence_interval_95":[0.5,0.8],"source_positions":[{"source":"EPA CTX / CalEPA","year":2021,"value":0.8,"weight":0.30176},{"source":"US EPA","year":2010,"value":0.75,"weight":0.41},{"source":"EPA CTX / NTP RoC","year":2021,"value":0.65,"weight":0.30176},{"source":"HQ_DIRECT","year":2026,"value":0.625,"weight":0.35},{"source":"IARC","year":1999,"value":0.5,"weight":0.41}]},"confidence":{"mean":0.756849,"weightedMean":0.756849,"std_dev":0.127359,"confidence_interval_95":[0.5,0.82],"source_positions":[{"source":"HQ_DIRECT","year":2026,"value":0.5,"weight":0.35},{"source":"IARC","year":1999,"value":0.82,"weight":0.41},{"source":"US EPA","year":2010,"value":0.82,"weight":0.41},{"source":"EPA CTX / NTP RoC","year":2021,"value":0.82,"weight":0.30176},{"source":"EPA CTX / CalEPA","year":2021,"value":0.82,"weight":0.30176}]},"recency":{"mean":0.553755,"weightedMean":0.553755,"std_dev":0.228859,"confidence_interval_95":[0.368,1],"source_positions":[{"source":"HQ_DIRECT","year":2026,"value":1,"weight":0.35},{"source":"IARC","year":1999,"value":0.5,"weight":0.41},{"source":"US EPA","year":2010,"value":0.5,"weight":0.41},{"source":"EPA CTX / NTP RoC","year":2021,"value":0.368,"weight":0.30176},{"source":"EPA CTX / CalEPA","year":2021,"value":0.368,"weight":0.30176}]},"methodology":{"mean":0.940796,"weightedMean":0.940796,"std_dev":0.119399,"confidence_interval_95":[0.7,1],"source_positions":[{"source":"HQ_DIRECT","year":2026,"value":0.7,"weight":0.35},{"source":"IARC","year":1999,"value":1,"weight":0.41},{"source":"US EPA","year":2010,"value":1,"weight":0.41},{"source":"EPA CTX / NTP RoC","year":2021,"value":1,"weight":0.30176},{"source":"EPA CTX / CalEPA","year":2021,"value":1,"weight":0.30176}]},"specificity":{"mean":0.783549,"weightedMean":0.783549,"std_dev":0.067659,"confidence_interval_95":[0.75,0.92],"source_positions":[{"source":"HQ_DIRECT","year":2026,"value":0.92,"weight":0.35},{"source":"IARC","year":1999,"value":0.75,"weight":0.41},{"source":"US EPA","year":2010,"value":0.75,"weight":0.41},{"source":"EPA CTX / NTP RoC","year":2021,"value":0.75,"weight":0.30176},{"source":"EPA CTX / CalEPA","year":2021,"value":0.75,"weight":0.30176}]},"consensus":{"exists":false,"strength":0.288713,"disagreement_magnitude":0.312066,"warning":null}},"interpretation":{"summary":"Regulatory agencies show substantial disagreement. EPA CTX / CalEPA classifies as higher risk (80th percentile), while IARC concludes lower risk (50th percentile).","confidence_note":"Moderate-quality evidence base. Disagreement reflects methodological and interpretive differences, not data quality issues.","context_note":null,"warning":null},"sources":[{"id":"iarc_71_ccl4","type":"regulatory","title":"IARC Monographs Volume 71: Carbon Tetrachloride","year":1999},{"id":"epa_ccl4_iris","type":"regulatory","title":"US EPA IRIS: Carbon Tetrachloride — Toxicological Review (Final)","year":2010},{"id":"atsdr_ccl4","type":"report","title":"ATSDR Toxicological Profile for Carbon Tetrachloride","year":2005},{"id":"r60-2026-09-25-d449-iris-20","type":"regulatory","title":"Carbon tetrachloride | CASRN 56-23-5 | DTXSID8020250 | IRIS | US EPA, ORD","url":"https://iris.epa.gov/ChemicalLanding/&substance_nmbr=20"},{"id":"r60-2026-09-28-d899-s1-b04-niosh-npg-npgd0107-carbon-tetrachloride","type":"regulatory","title":"CDC - NIOSH Pocket Guide to Chemical Hazards - Carbon tetrachloride","url":"https://www.cdc.gov/niosh/npg/npgd0107.html"},{"id":"r60-2026-09-25-d867-ecfr-29cfr1926-subpartD","type":"regulatory","title":"Subpart D—Occupational Health and Environmental Controls","url":"https://www.ecfr.gov/api/versioner/v1/full/2026-09-01/title-29.xml?part=1926&subpart=D"},{"id":"r60-2026-09-24-d867-ecfr-29cfr1910.1000","type":"regulatory","title":"§ 1910.1000 Air contaminants.","url":"https://www.ecfr.gov/api/versioner/v1/full/2026-09-22/title-29.xml?part=1910&section=1910.1000"},{"id":"r60-2026-09-27-d820-osha-annotated-table-z-1","type":"regulatory","title":"Permissible Exposure Limits – OSHA Annotated Table Z-1 | Occupational Safety and Health Administration","url":"https://www.osha.gov/annotated-pels/table-z-1"},{"id":"r60-2026-09-29-d899-s2-b07-iris-0020-summary-carbon-tetrachloride","type":"regulatory","title":"Carbon tetrachloride; CASRN 56-23-5","url":"https://iris.epa.gov/static/pdfs/0020_summary.pdf"},{"id":"r60-2026-09-27-d899-who-gdwq-4th-ed-addenda-2026-pdftotext","type":"regulatory","title":"Guidelines for drinking-water quality: fourth edition incorporating the first, second and third addenda","url":"https://iris.who.int/server/api/core/bitstreams/c60cc28e-defe-45ed-b157-71fdd43902bf/content"},{"id":"r60-2026-09-30-d918-oehha-prop65-list-csv-own-url","type":"regulatory","title":"PROPOSITION 65 LIST OF CARCINOGENS OR REPRODUCTIVE TOXICANTS","year":2026,"url":"https://oehha.ca.gov/sites/default/files/media/2025-01/p65chemicalslist.csv"},{"id":"r60-2026-09-26-d867-cc1-iarc-list-of-classifications-loc-app","type":"regulatory","title":"IARC Monographs, List of Classifications","year":2026,"url":"https://monographs.iarc.who.int/list-of-classifications"},{"id":"r60-ntp-roc-15th-listed-substances","type":"regulatory","title":"Substances Listed in the Fifteenth Report on Carcinogens","url":"https://ntp.niehs.nih.gov/sites/default/files/ntp/roc/content/listed_substances_508.pdf"},{"id":"r60-2026-09-26-d867-cc2-epa-dwsha-2018-tables","type":"regulatory","title":"US EPA, Drinking Water Standards and Health Advisories Tables (2018 Edition)","url":"https://www.epa.gov/system/files/documents/2022-01/dwtable2018.pdf"},{"id":"r60-2026-10-01-dd54-hc-trvs-v2-h128-1-11-638","type":"regulatory","title":"Federal Contaminated Site Risk Assessment in Canada, Part II: Health Canada Toxicological Reference Values (TRVs) and Chemical-Specific Factors, Version 2.0","url":"http://publications.gc.ca/collections/collection_2012/sc-hc/H128-1-11-638-eng.pdf"},{"id":"echa-chem-reach-registrations","type":"regulatory","title":"ECHA CHEM, Download all substances: REACH registrations (ECHA's own list of REACH-registered substances)","year":2026,"url":"https://chem.echa.europa.eu/"},{"id":"src_pubchem_tox_5943","type":"pubchem","title":"PubChem: Toxicity section (CID 5943)","url":"https://pubchem.ncbi.nlm.nih.gov/rest/pug_view/data/compound/5943/JSON?heading=Toxicity"},{"id":"r60-2026-10-03-d928-cellar-32017l0164","type":"regulatory","title":"L_2017027EN.01011501.xml","url":"https://publications.europa.eu/resource/celex/32017L0164"},{"id":"pubchem-exp-cameo-chemicals-cid-5943","type":"database","title":"CAMEO Chemicals, as recorded by PubChem (Experimental Properties, CID 5943; where-to-look, not a source of this value)","year":2026,"url":"https://pubchem.ncbi.nlm.nih.gov/rest/pug_view/data/compound/5943/JSON?heading=Experimental+Properties"},{"id":"pubchem-exp-hazardous-substances-data-bank-cid-5943","type":"database","title":"Hazardous Substances Data Bank (HSDB), as recorded by PubChem (Experimental Properties, CID 5943; where-to-look, not a source of this value)","year":2026,"url":"https://pubchem.ncbi.nlm.nih.gov/rest/pug_view/data/compound/5943/JSON?heading=Experimental+Properties"},{"id":"ctx_pred_dtxsid8020250","type":"reference","title":"EPA CompTox CTX API: predicted properties for DTXSID8020250 (Carbon tetrachloride)","url":"https://comptox.epa.gov/ctx-api/chemical/property/predicted/search/by-dtxsid/DTXSID8020250"},{"id":"r60-2026-10-01-echa-annex-vi-clp-table-atp23-xlsx","type":"regulatory","title":"ECHA Annex VI to CLP: the unofficial Excel table (up to and including the 23rd ATP)","url":"https://echa.europa.eu/documents/10162/17218/annex_vi_clp_table_atp23_en.xlsx/b3816c13-81a3-816d-773a-62e88c4e2700?t=1761727004499"}],"sources_scope":"context","derived_markers":[],"warnings":["year_inferred:EPA CTX / NTP RoC:2021","year_inferred:EPA CTX / CalEPA:2021","unmapped_classification:EPA CTX / NIOSH:potential occupational carcinogen","unmapped_classification:EPA CTX / Health Canada:group iii: cepa (possibly carcinogenic to humans)","unmapped_classification:US EPA (CompTox genotoxicity summary):epa comptox computed genotoxicity summary: positiv","unmapped_classification:US EPA (CompTox genotoxicity summary):epa comptox computed genotoxicity summary: positiv","unmapped_classification:Canada, as recorded by ToxValDB:skin irritation: skin corrosion/irritation - categ","unmapped_classification:Canada, as recorded by ToxValDB:skin sensitization: skin sensitization - category ","unmapped_classification:Japan, as recorded by ToxValDB:eye irritation: category 2 (score: high)","unmapped_classification:Japan, as recorded by ToxValDB:skin irritation: category 2 (score: high)","unmapped_classification:New Zealand, as recorded by ToxValDB:eye irritation: category 6.4a (category 2a) (score","unmapped_classification:New Zealand, as recorded by ToxValDB:skin irritation: category 6.3a (category 2) (score","unmapped_classification:ECHA eChemPortal, as recorded by ToxValDB:skin irritation: in vivo: moderate or mild irritat","unmapped_classification:ECHA eChemPortal, as recorded by ToxValDB:eye irritation: in vivo: moderate or mild irritati","unmapped_classification:ECHA eChemPortal, as recorded by ToxValDB:skin sensitisation: in vivo (llna): low to moderat"],"meta":{"synthesis_version":"1.1.0","config_version":"1.1.0","n_sources":5,"db_version":52,"warnings":["year_inferred:EPA CTX / NTP RoC:2021","year_inferred:EPA CTX / CalEPA:2021","unmapped_classification:EPA CTX / NIOSH:potential occupational carcinogen","unmapped_classification:EPA CTX / Health Canada:group iii: cepa (possibly carcinogenic to humans)","unmapped_classification:US EPA (CompTox genotoxicity summary):epa comptox computed genotoxicity summary: positiv","unmapped_classification:US EPA (CompTox genotoxicity summary):epa comptox computed genotoxicity summary: positiv","unmapped_classification:Canada, as recorded by ToxValDB:skin irritation: skin corrosion/irritation - categ","unmapped_classification:Canada, as recorded by ToxValDB:skin sensitization: skin sensitization - category ","unmapped_classification:Japan, as recorded by ToxValDB:eye irritation: category 2 (score: high)","unmapped_classification:Japan, as recorded by ToxValDB:skin irritation: category 2 (score: high)","unmapped_classification:New Zealand, as recorded by ToxValDB:eye irritation: category 6.4a (category 2a) (score","unmapped_classification:New Zealand, as recorded by ToxValDB:skin irritation: category 6.3a (category 2) (score","unmapped_classification:ECHA eChemPortal, as recorded by ToxValDB:skin irritation: in vivo: moderate or mild irritat","unmapped_classification:ECHA eChemPortal, as recorded by ToxValDB:eye irritation: in vivo: moderate or mild irritati","unmapped_classification:ECHA eChemPortal, as recorded by ToxValDB:skin sensitisation: in vivo (llna): low to moderat"]},"schema":"synthesis","_notice":"ALETHEIA output is reference data, not professional advice. Not a substitute for primary agency sources or qualified professionals. See https://aletheia.holisticquality.io/disclaimer.","_disclaimer_url":"https://aletheia.holisticquality.io/disclaimer","available_contexts":["human_adult","human_child","exposure_inhalation","exposure_ingestion","aquatic_life","human_teen","human_elderly","human_infant","human_pregnant","exposure_dermal","exposure_ocular","occupational_exposure"]}