{"schemaVersion":"1.0","generatedAt":"2026-09-22","licence":{"status":"not-yet-granted","spdx":null,"statement":"No licence has yet been granted for SmellBook-created datasets. They are publicly readable; reuse beyond citation and quotation needs permission until a licence is published."},"node":{"entityType":"claim","urn":"smellbook:claim:diacetyl-and-2-3-pentanedione-in-air-sampled-on-cafe-baristas","key":"diacetyl-and-2-3-pentanedione-in-air-sampled-on-cafe-baristas","label":"Diacetyl and 2,3-pentanedione in air sampled on café baristas","description":"In a study of 17 coffee roasting and packaging facilities that included 10 cafés, baristas in cafés had mean full-shift exposures of 4.1 parts per billion diacetyl and 4.6 parts per billion 2,3-pentanedione (geometric means), measured in personal air samples.","scope":"Ten cafés, nine of them sampled, belonging to the US coffee roasting and packaging companies studied, all at facilities not flavouring coffee during the survey, some on the roasting site and some elsewhere; the café results are not separated by location. The barista results come from 14 personal air samples worn by 13 baristas over a work shift: occupational air composition, not the smell of a coffee shop; neither compound is named as the cause of any smell; not every coffee shop; the study's health and exposure-limit findings are outside this claim.","evidenceClass":"scientific","canonicalUrl":"https://smellbook.com/evidence/claims/diacetyl-and-2-3-pentanedione-in-air-sampled-on-cafe-baristas","attribution":"SmellBook (https://smellbook.com)"},"outgoing":[{"relation":"cites-source","label":"cites source","entity":"smellbook:source:coffee-roasting-facilities-and-cafes-air-2020","entityLabel":"Exposures and Emissions in Coffee Roasting Facilities and Cafés: Diacetyl, 2,3-Pentanedione, and Other Volatile Organic Compounds","record":"/data/graph/source/coffee-roasting-facilities-and-cafes-air-2020.json","provenance":[{"basis":"claim-record","field":"verifiedClaims[CLM-COFFEESHOP-001].sourceIds","evidenceClass":"editorial"}]},{"relation":"claim-about","label":"claim about","entity":"smellbook:smell:coffee-shop","entityLabel":"Coffee Shop","record":"/data/graph/smell/coffee-shop.json","provenance":[{"basis":"claim-record","field":"verifiedClaims[CLM-COFFEESHOP-001].smellSlugs","evidenceClass":"editorial"}]}],"incoming":[],"corrections":[],"citation":null,"boundary":"Edges are typed and unweighted; none is a similarity, recommendation or personalization score. Browser-local Personal SmellBook data is never part of this export."}