{"hq_id":"hq-p-spe-000099","name":"Woodworking Dust (Species Toxicity, Allergenic Hardwoods, Dust Collection)","category":{"primary":"specialty","secondary":"craft","tags":["woodworking","dust","wood species","toxic","allergenic","dust collection","OSHA","hardwood"]},"product_tier":"SPE","overall_risk_level":"moderate_to_high","description":"Wood dust exposure during woodworking: IARC Group 1 carcinogen (nasopharyngeal cancer from hardwood dust). Species-specific toxicity: western red cedar (plicatic acid — occupational asthma), cocobolo/rosewood (severe contact dermatitis), teak (contact sensitizer), MDF (formaldehyde from urea-formaldehyde binder). OSHA PEL: 5 mg/m³ total dust, 1 mg/m³ for western red cedar. Dust collection at source (table saw, router, sander) + ambient air filtration + N95 = comprehensive protection.","synthesis":{"derived_risk_level":"moderate_to_high","synthesis_confidence":0.736,"synthesis_method":"compound_composition","context_used":"human_adult","context_source":"product_users","exposure_modifier":1.1,"vulnerability_escalated":false,"escalation_reason":null,"compounds_resolved":2,"compounds_total":2,"synthesis_date":"2026-05-09","synthesis_version":"1.2.0","methodology_note":"exposure_modifier and adjusted_magnitude are computed from ALETHEIA-calibrated heuristics (route × duration × frequency multipliers, clamped to [0.5, 1.4]). Multipliers are directionally informed by EPA Exposure Factors Handbook (2011) and CalEPA OEHHA but are not regulatory consensus. See /api/methodology for full disclosure."},"hazard_summary":{"sensitive_populations":"hobby and professional woodworkers, cedar workers","overall_risk":"moderate_to_high","primary_concerns":["IARC Group 1: hardwood dust causes nasopharyngeal cancer","Western red cedar: occupational asthma (plicatic acid) in 5-13% exposed","MDF machining: formaldehyde + fine dust","Tropical hardwoods: severe contact dermatitis (cocobolo, rosewood)"],"exposure_routes":"Inhalation of wood dust (primary cancer/asthma route); dermal (contact dermatitis)"},"exposure":{"routes":["inhalation","dermal"],"contact_types":["inhalation","skin_brief"],"users":["adult","occupational"],"duration":"hours","frequency":"weekly","scenarios":["Table saw/router generating high-concentration wood dust plume","Sanding: finest dust particles (most dangerous — penetrate deep lung)","MDF routing/cutting: formaldehyde + fine dust combination","Tropical hardwood contact dermatitis (cocobolo, rosewood, teak)"],"notes":"IARC 2012: wood dust confirmed Group 1 carcinogen for nasopharyngeal cancer (primarily hardwood). Western red cedar plicatic acid: causes occupational asthma in 5-13% of exposed workers. Dust collection hierarchy: source capture (best) → ambient filtration → personal N95 (supplemental). MDF is particularly hazardous: fine dust + formaldehyde from binder. Always use source-capture dust collection when machining."},"consumer_guidance":{"usage_warning":"Use dust collection at every power tool. Wear N95 minimum during sanding and machining. Research wood species toxicity before working with unfamiliar species. MDF: always use dust collection — never sand without capture. Western red cedar: P100 respirator + source capture. Ambient air cleaner in shop.","safer_alternatives":["Source-capture dust collection at every machine","Shop ambient air cleaner (JET AFS, WEN)","N95/P100 respirator during all dust-generating operations","Research species toxicity (Wood Database toxicity ratings)"],"red_flags":[{"indicator":"Working without ventilation or respiratory protection","meaning":"Chemical exposure at hobby level can cause occupational-grade health effects.","action":"Use ventilation and PPE appropriate to the specific hazard."}],"green_flags":[{"indicator":"Using appropriate PPE and ventilation for the specific task","meaning":"Exposure controlled to safe levels.","verification":"Match PPE to specific hazard (N95 for dust, organic vapor for solvents, supplied air for isocyanate)."}],"what_to_ask":[{"question":"What are the specific chemical hazards of this hobby material?","why_it_matters":"Hobby exposures lack occupational protections but cause the same health effects.","good_answer":"SDS available, specific PPE identified, ventilation plan in place.","bad_answer":"No hazard awareness or PPE use."}],"alternatives":[{"name":"Source-capture dust collection at every machine","notes":"Alternative"},{"name":"Shop ambient air cleaner","notes":"JET AFS, WEN"},{"name":"N95/P100 respirator during all dust-generating operations","notes":"Alternative"}]},"regulatory":{"applicable_regulations":[{"jurisdiction":"USA","regulation":"OSHA Wood Dust PEL","citation":"29 CFR 1910.1000","requirements":"Total dust: 5 mg/m³ TWA. Western red cedar: 1 mg/m³ (ACGIH TLV 0.5 mg/m³).","compliance_status":null,"effective_date":null,"enforcing_agency":"OSHA","penalties":null,"source_ref":null}],"certifications":[],"labeling":{"required_disclosures":[],"prop65_warning":{"required":null,"chemicals":[],"endpoint":null,"notes":null},"ghs_labeling":{"required":null,"signal_word":null,"pictograms":[],"hazard_statements":[],"notes":null},"hidden_ingredients":{"trade_secret_protected":null,"categories_hidden":[],"estimated_count":null,"known_concerns":null,"notes":null},"notes":null},"recalls":[],"regulatory_gap":null,"notes":null},"lifecycle":{"recyclable":false,"disposal_guidance":"Wood dust: regular waste (sealed bag to prevent dispersal).","hazardous_waste":false,"expected_lifespan":"varies"},"formulation":{"form":"varies","key_ingredients":[{"hq_id":"hq-c-org-000011","name":"Formaldehyde","role":"MDF_binder","concentration_pct":"trace in MDF dust"},{"hq_id":"hq-c-ino-000008","name":"Crystalline silica (quartz)","role":"dust_analogy","concentration_pct":"varies"}],"certifications":[]},"materials":{"common":[],"concerning":[],"preferred":[]},"compound_composition":[{"hq_id":"hq-c-org-000011","compound_name":null,"role":"MDF_binder","typical_concentration":"trace in MDF dust"},{"hq_id":"hq-c-ino-000008","compound_name":null,"role":"dust_analogy","typical_concentration":"varies"}],"identifiers":{"common_names":["woodworking dust (species toxicity, allergenic hardwoods, dust collection)"],"aliases":[],"manufacturer":null,"brands":[]},"brand_examples":[{"brand":"3M","manufacturer":"3M","market_position":"mass_market","notable":"Safety and specialty product conglomerate"},{"brand":"Honeywell","manufacturer":"Honeywell","market_position":"mass_market","notable":"Safety equipment and technology"},{"brand":"DuPont","manufacturer":"DuPont","market_position":"professional","notable":"Chemical and safety products"}],"brand_examples_disclaimer":"Representative branded products of this category. Concerning ingredients listed in materials.concerning[] apply to the category, not necessarily to every named brand. Specific formulations vary by SKU and may have changed since this record was written; consult the brand's current ingredient label before drawing brand-level conclusions.","sources":[{"type":"expert_curation","name":"ALETHEIA Safety Database","date":"2026-03-25"},{"type":"regulation","title":"OSHA Wood Dust PEL (29 CFR 1910.1000)","jurisdiction":"USA","citation":"29 CFR 1910.1000","id":"src_9b124677"},{"id":"iarc_100f_form","type":"regulatory","title":"IARC Monographs Volume 100F: Formaldehyde","year":2012,"inherited_from_compound":"hq-c-org-000011"},{"id":"epa_form_iris","type":"regulatory","title":"US EPA IRIS Assessment: Formaldehyde (draft)","year":2010,"inherited_from_compound":"hq-c-org-000011"},{"id":"iarc_100c_si","type":"regulatory","title":"IARC Monographs Volume 100C: Silica Dust, Crystalline, in the Form of Quartz or Cristobalite — Arsenic, Metals, Fibres, and Dusts","year":2012,"inherited_from_compound":"hq-c-ino-000008"},{"id":"osha_silica","type":"regulatory","title":"OSHA 29 CFR 1910.1053: Occupational Exposure to Respirable Crystalline Silica","year":2016,"inherited_from_compound":"hq-c-ino-000008"},{"type":"regulatory","title":"US Occupational Safety and Health Administration (OSHA)","jurisdiction":"USA","id":"src_ef6d897f","extraction":"description_reference"},{"type":"monograph","title":"International Agency for Research on Cancer (IARC)","jurisdiction":"International","id":"src_d9ebbaf2","extraction":"description_reference"}],"meta":{"schema_version":"4.0.0","last_updated":"2026-03-25","timestamp":"2026-05-14T01:23:21.772Z"}}