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Understanding Indoor Air Quality
Pollutant
Problems |
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All homes, no matter how clean they appear, are contaminated
with dirt and dust.
Older homes can be breeding grounds for mold and mildew.
New, tightly sealed homes trap pollutants and can have higher concentrations
of chemicals. |
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| Types &
Sources of Pollutants |
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| Type |
Definition |
Pollutants |
Sources |
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Particles |
Pollutants found in the air |
hPollen
hDust mites
hDirt
hPet and human dander |
hPlants, people and
animals |
Microorganisms/
Bioaerosols |
Microscopic pollutants that grow and reproduce in warm,
humid environments |
hBacteria
hViruses
hMold
Spores
hFungi |
hPlants,
people and animals
hDuctwork
hHumidifier drip pans
hShower heads and toilets
hHVAC systems that have not
been properly maintained
hPlumbing Leaks
hDampness in
basements, crawl spaces, attics and bathrooms |
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Odors/Chemical Vapors |
Air contaminants in the form of gases |
hPet odors
hCooking
smells
hGasoline
fumes
hVolatile
organic compounds (VOCs), such as formaldehyde and
gasoline
hCarbon
dioxide
hCarbon
monoxide
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hCleaning
supplies
hPaints
and solvents
hPerfumes
hTobacco
smoke
hCarpeting
and upholstery
hAir
fresheners
hAutomotive
fuel and supplies
hDry-cleaned
clothing
hStoves,
heaters, fireplaces
hPesticides
and herbicides |
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Source: Lennox
Industries - www.lennox.com |
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Humidification |
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Maintaining proper
humidity levels, between 35% and 50%, has a significant impact
on overall indoor air quality. Source:
ASHRAE, adapted from Sterling et al., 1985 |
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