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Indoor Air Quality
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Indoor air quality (IAQ) involves both objective guidelines met and subjective satisfaction of occupants. SBS affects many people with non-medical symptoms vanishing outside. BRI is due to contaminants causing distinguishable symptoms plus physical signs. MPS spreads suddenly, often related to odors.
Contaminants like radon, inorganic gases, microorganisms, particulate matter, lead, and others affect health. IAQ issues include thermal comfort, humidity, mold, condensation, and HVAC pollutants. VOCs, formaldehyde, CO2, CO, ozone, NO2, SO2, and PM are key indicators with specific standards.
LEED certification limits CO concentration indoors. Standards
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- Indoor Air Quality (IAQ) defined in two ways: extent of objective guidelines met or subjective satisfaction; acceptable air quality is free from contaminants and satisfies at least 80% of people
- Sick Building Syndrome (SBS): symptoms disappear after leaving the building, often related to eye, nose, throat irritation, skin issues, headaches; Building-Related Illness (BRI) involves specific physical signs and clinical abnormalities due to indoor contaminants like carbon monoxide
- Mass Psychogenic Illness (MPS): sudden onset of symptoms spread by sight or contact, linked to high temperature and humidity; common pollutants include radon, inorganic gases, microorganisms, particulate matter, lead
- ASHARE standard 55 considers thermal comfort with IAQ; indoor air quality includes thermal, visual, acoustic, and human stress aspects; HVAC systems can be sources of pollutants due to dust accumulation in filters and fan coils
- Main contaminants: dust, fibers, mites, airborne chemicals, combustion outcomes, environmental tobacco smoke, odors; key indicators like volatile organic compounds (VOCs), formaldehyde, carbon dioxide (CO2), carbon monoxide (CO), ozone (O3), nitrogen dioxide (NO2), sulfur dioxide (SO2), particulate matter (PM)
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