Indoor Exposome: Home & Building Environment — Exposome
Comprehensive indoor exposome management — VOCs, formaldehyde, flame retardants, cleaning chemicals, synthetic fragrances, dust-bound chemicals, radon, and building material off-gassing.
Overview
Indoor air quality is typically 2-5x worse than outdoor air (EPA), and Americans spend approximately 90% of their time indoors. The indoor exposome represents a concentrated source of chemical, physical, and biological exposures. Key indoor exposome components include: formaldehyde (off-gassing from pressed wood, laminate flooring, insulation — classified Group 1 carcinogen by IARC); flame retardants (PBDEs, OPFRs in furniture, mattresses, electronics — endocrine disruptors with long half-lives); VOCs (hundreds of volatile organic compounds from paint, adhesives, cleaning products, air fresheners); synthetic fragrances (the average fragrance contains 14 undisclosed chemicals including phthalates and synthetic musks); household dust (acts as a reservoir for accumulated chemical residues — flame retardants, PFAS, pesticides, lead); cleaning product chemicals (quaternary ammonium compounds, triclosan, chlorine bleach fumes); radon (colorless, odorless radioactive gas responsible for ~21,000 lung cancer deaths/year in US); and building materials (asbestos in pre-1980 construction). A 2023 study in Environmental Science & Technology found that household dust contains detectable levels of 45+ endocrine-disrupting chemicals.
Indications
- Respiratory symptoms that improve away from home
- Residence in new construction or recently renovated building (high VOC off-gassing)
- Pre-1980 construction (asbestos, lead paint, radon risk)
- Unexplained headaches, fatigue, or hormonal disruption at home
- Pregnancy or young children in household (heightened vulnerability)
- Home optimization for longevity and health performance
Mechanism of Action
Indoor air represents the highest-volume environmental exposure route — adults inhale 11,000 liters of air daily, and indoor-predominant lifestyle means the majority of inhaled chemicals originate from indoor sources (building materials, products, dust)
Dosing
| Compound | Dose | Frequency | Notes |
|---|---|---|---|
| HEPA + Activated Carbon Air Purifier | Minimum CADR 200 cfm for bedroom; one unit per occupied room | 24/7 operation; filter replacement per manufacturer | HEPA removes 99.97% particles ≥ 0.3μm; activated carbon adsorbs VOCs; recommended: IQAir HealthMate, Austin Air HealthMate, Blueair; NO ozone-generating units |
| Non-Toxic Cleaning Products | Replace all conventional cleaning products | Permanent substitution | Use EWG Guide to Healthy Cleaning (A or B rated); effective alternatives: white vinegar, baking soda, castile soap, hydrogen peroxide; avoid synthetic fragrances, QACs, triclosan |
| Fragrance-Free Policy | Eliminate synthetic fragrances from home | Permanent | Remove plug-in air fresheners, scented candles, fabric softener, dryer sheets; 'fragrance' = undisclosed mixture of 10-300+ chemicals; use essential oils sparingly if desired |
| Dust Reduction Protocol | HEPA vacuum 2x/week; wet-dust surfaces weekly | Weekly | Household dust contains accumulated flame retardants, PFAS, pesticides, lead; HEPA vacuum essential (conventional vacuums recirculate fine particles); remove shoes at door |
Safety & Contraindications
- Asbestos should NEVER be disturbed without professional abatement — disturbing intact asbestos creates airborne fibers
- Aggressive mold remediation without proper containment can spread spores throughout the building
- Some 'natural' cleaning products still contain significant VOCs — verify with third-party testing (EWG)
- Radon mitigation systems require professional installation — not a DIY project for most homeowners