{"hq_id":"hq-p-hom-000191","name":"Radon in Basement and Ground Floor (Second Leading Cause of Lung Cancer)","category":{"primary":"household","secondary":"indoor_environment","tags":["radon","basement","lung cancer","EPA","test kit","mitigation","sub-slab"]},"product_tier":"HOM","overall_risk_level":"high","description":"Radon-222: radioactive gas from natural uranium decay in soil that seeps through basement cracks, sump pits, and foundation joints. Second leading cause of lung cancer after smoking (21,000 US deaths/year — EPA). Odorless, colorless, tasteless — testing is the ONLY way to detect. EPA action level: 4.0 pCi/L. 1 in 15 US homes exceeds the EPA action level. Mitigation (sub-slab depressurization) reduces levels 80-99% and costs $800-2,500.","synthesis":{"derived_risk_level":"extreme","synthesis_confidence":0.744,"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 — especially smokers (synergistic risk)","overall_risk":"high","primary_concerns":["Second leading cause of lung cancer in US (21,000 deaths/year)","1 in 15 US homes exceeds EPA 4.0 pCi/L action level","Odorless, colorless, tasteless — testing is ONLY detection method","Smoker + radon: 10-25x combined lung cancer risk"],"exposure_routes":"Continuous inhalation of radon-222 and radioactive decay products"},"exposure":{"routes":["inhalation"],"contact_types":["inhalation"],"users":["adult","child"],"duration":"continuous","frequency":"daily","scenarios":["Continuous inhalation of radon and decay products in basement/ground floor","Sleeping in basement bedroom: highest-duration radon exposure","Radon decay products (polonium-218, -214) depositing in lung tissue","Smoker + radon: synergistic lung cancer risk (10-25x combined)"],"notes":"EPA: test every home below the third floor. Short-term test kits available at hardware stores ($15-30) or free from state radon programs. Long-term test (91+ days) provides better average. If ≥4 pCi/L: mitigate. Sub-slab depressurization (active soil depressurization) is the standard mitigation — a fan-powered pipe system drawing radon from beneath the foundation before it enters. Radon-resistant new construction (RRNC) adds $300-500 to new home cost."},"consumer_guidance":{"usage_warning":"TEST your home. Short-term test kits at hardware stores ($15-30). Place in lowest livable level (basement or ground floor). If ≥4 pCi/L: install sub-slab depressurization system ($800-2500). Retest after mitigation to verify <4 pCi/L. New homes: request radon-resistant new construction (RRNC).","safer_alternatives":["Sub-slab depressurization system (80-99% radon reduction)","Radon-resistant new construction (RRNC) for new homes","Sealing cracks and sump pit covers (supplemental, not sufficient alone)","Increased ventilation in basement (supplemental approach)"],"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":"Sub-slab depressurization system","notes":"80-99% radon reduction"},{"name":"Radon-resistant new construction","notes":"RRNC) for new homes"},{"name":"Sealing cracks and sump pit covers","notes":"supplemental, not sufficient alone"}]},"regulatory":{"applicable_regulations":[{"jurisdiction":"USA","regulation":"EPA Radon Action Level","citation":"EPA 402-R-12-002","requirements":"Action level: 4.0 pCi/L. Recommend mitigation at or above this level. Consider mitigation at 2-4 pCi/L. WHO recommends 2.7 pCi/L (100 Bq/m3).","compliance_status":null,"effective_date":null,"enforcing_agency":"EPA (guidance — no mandate)","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":"Test kit: regular waste after use.","hazardous_waste":false,"expected_lifespan":"continuous"},"formulation":{"form":"varies","key_ingredients":[{"hq_id":"hq-c-ino-000004","name":"Radon","role":"radioactive_gas","concentration_pct":"0.4-200+ pCi/L"}],"certifications":[]},"materials":{"common":[],"concerning":[],"preferred":[]},"compound_composition":[{"hq_id":"hq-c-ino-000004","compound_name":null,"role":"radioactive_gas","typical_concentration":"0.4-200+ pCi/L"}],"identifiers":{"common_names":["radon in basement and ground floor (second leading cause of lung cancer)"],"aliases":[],"manufacturer":null,"brands":[]},"brand_examples":[{"brand":"Kidde","manufacturer":"Carrier Global","market_position":"mass_market","notable":"CO/gas detector market leader"},{"brand":"First Alert","manufacturer":"Resideo","market_position":"mass_market","notable":"Home safety and gas detection"},{"brand":"Watts","manufacturer":"Watts Water Technologies","market_position":"professional","notable":"Earthquake gas shut-off valves"}],"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":"EPA Radon Action Level (EPA 402-R-12-002)","jurisdiction":"USA","citation":"EPA 402-R-12-002","id":"src_80c09bc5"},{"id":"iarc_100d","type":"regulatory","title":"IARC Monographs Volume 100D: Radiation — Radon-222 and its Decay Products","year":2012,"inherited_from_compound":"hq-c-ino-000004"},{"id":"epa_radon","type":"regulatory","title":"US EPA: A Citizen's Guide to Radon","year":2003,"inherited_from_compound":"hq-c-ino-000004"},{"type":"regulatory","title":"US Environmental Protection Agency (EPA)","jurisdiction":"USA","id":"src_defdd418","extraction":"description_reference"}],"meta":{"schema_version":"4.0.0","last_updated":"2026-03-25","timestamp":"2026-05-14T01:24:40.665Z"}}