{"hq_id":"hq-p-hom-000186","name":"Carbon Monoxide Detector (Sensor Lifespan, Placement, False Negatives)","category":{"primary":"household","secondary":"safety_device","tags":["carbon monoxide","CO detector","alarm","electrochemical","sensor lifespan","placement"]},"product_tier":"HOM","overall_risk_level":"low","description":"Residential CO detectors using electrochemical sensors with 5-7 year lifespan (sealed 10-year units available). CO detectors save 400+ lives per year in the US. Critical limitations: electrochemical sensors degrade silently — detector may show green 'OK' light but have diminished sensitivity. Proper placement is crucial: CO is slightly lighter than air, so detectors should be placed at breathing height (not ceiling). 37 states + DC require CO detectors in residential dwellings.","synthesis":{"derived_risk_level":"extreme","synthesis_confidence":0.5,"synthesis_method":"compound_composition","context_used":"human_child","context_source":"product_users","exposure_modifier":1.4,"vulnerability_escalated":false,"escalation_reason":null,"compounds_resolved":1,"compounds_total":1,"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":"all occupants (CO is universally lethal)","overall_risk":"low","primary_concerns":["Expired sensors giving false sense of security","CO is odorless, colorless — detector is ONLY warning system","Improper placement reducing detection effectiveness","13 states still do not require residential CO detectors"],"exposure_routes":"CO detector is a safety device — protects against CO inhalation"},"exposure":{"routes":["inhalation"],"contact_types":["inhalation"],"users":["adult","child"],"duration":"continuous","frequency":"daily","scenarios":["CO detector protecting sleeping occupants from furnace/water heater malfunction","Expired sensor giving false sense of security (green light but degraded sensitivity)","Incorrect ceiling placement reducing detection speed","Missing CO detector in bedrooms: 400+ deaths/year from CO in homes"],"notes":"UL 2034: CO alarm must activate within 189 minutes at 70 ppm, 50 minutes at 150 ppm, 15 minutes at 400 ppm. Electrochemical sensors degrade over time — replace by expiration date (5-7 years, or 10 years for sealed units). Place outside each sleeping area and on every level. DO NOT place in kitchen (cooking fumes cause false alarms) or near fuel-burning appliances (proximity alarms). Interconnected alarms provide best protection."},"consumer_guidance":{"usage_warning":"Replace CO detectors by expiration date (usually 5-7 years from manufacture). Place outside each sleeping area at breathing height (not ceiling). Test monthly with test button. Install on every level of home. Choose interconnected alarms (when one sounds, all sound). Consider combination smoke/CO units.","safer_alternatives":["10-year sealed lithium battery CO detectors (Kidde, First Alert)","Interconnected wireless CO alarms (all units alarm together)","Combination smoke + CO detectors (reduce total devices)","Smart CO detectors (Nest Protect, First Alert Onelink — phone notification)"],"red_flags":[{"indicator":"Visible mold, persistent chemical odor, or symptoms when home","meaning":"Indoor air quality issue requiring investigation.","action":"Test air quality. Address moisture sources. Improve ventilation."}],"green_flags":[{"indicator":"GREENGUARD Gold, CRI Green Label Plus, or equivalent IAQ certification","meaning":"Product tested for low chemical emissions.","verification":"Check for IAQ certification marks on packaging or manufacturer website."}],"what_to_ask":[{"question":"What is the VOC emission profile of this product?","why_it_matters":"Indoor air quality is #1 modifiable environmental health factor — 90% of time spent indoors.","good_answer":"GREENGUARD Gold certified or emission testing data available.","bad_answer":"No emission testing or IAQ certification."}],"alternatives":[{"name":"10-year sealed lithium battery CO detectors","notes":"Kidde, First Alert"},{"name":"Interconnected wireless CO alarms","notes":"all units alarm together"},{"name":"Combination smoke + CO detectors","notes":"reduce total devices"}]},"regulatory":{"applicable_regulations":[{"jurisdiction":"USA","regulation":"37 states + DC require residential CO detectors","citation":"Various state building codes","requirements":"Requirements vary by state. Most require CO detectors outside sleeping areas in homes with fuel-burning appliances or attached garages.","compliance_status":null,"effective_date":null,"enforcing_agency":"State/local fire marshal","penalties":null,"source_ref":null}],"certifications":[{"name":"UL 2034","issuer":"UL","standard":"UL 2034","scope":"Standard for Single and Multiple Station Carbon Monoxide Alarms. Alarm thresholds and response times."}],"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":"Regular waste. Replace at expiration date — do not delay.","hazardous_waste":false,"expected_lifespan":"5-10_years"},"formulation":{"form":"varies","key_ingredients":[{"hq_id":"hq-c-org-000043","name":"Carbon monoxide","role":"target_gas","concentration_pct":"alarm at 70 ppm"}],"certifications":[]},"materials":{"common":[],"concerning":[],"preferred":[]},"compound_composition":[{"hq_id":"hq-c-org-000043","compound_name":null,"role":"target_gas","typical_concentration":"alarm at 70 ppm"}],"identifiers":{"common_names":["carbon monoxide detector (sensor lifespan, placement, false negatives)"],"aliases":[],"manufacturer":null,"brands":[]},"brand_examples":[{"brand":"SC Johnson","manufacturer":"SC Johnson","market_position":"mass_market","notable":"Household product conglomerate"},{"brand":"Clorox","manufacturer":"Clorox","market_position":"mass_market","notable":"Household cleaning market leader"},{"brand":"3M","manufacturer":"3M","market_position":"mass_market","notable":"Home safety and maintenance 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":"37 states + DC require residential CO detectors (Various state building codes)","jurisdiction":"USA","citation":"Various state building codes","id":"src_d35eabcd"},{"id":"cdc_co_poisoning","type":"report","title":"CDC: Carbon Monoxide Poisoning — Facts and Prevention","year":2023,"inherited_from_compound":"hq-c-org-000043"},{"id":"atsdr_co","type":"report","title":"ATSDR Toxicological Profile for Carbon Monoxide","year":2012,"inherited_from_compound":"hq-c-org-000043"}],"meta":{"schema_version":"4.0.0","last_updated":"2026-03-25","timestamp":"2026-05-14T01:25:54.120Z"}}