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Polluted Outdoor Air
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Pollen, dust, mold spores
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Industrial emissions
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Vehicle and non-road engine emissions (cars, buses, trucks, lawn and garden equipment
Nearby Sources
- Loading docks
- Odors from dumpsters
- Unsanitary debris or building exhausts near outdoor air intakes
Underground Sources
- Radon
- Pesticides
- Leakage from underground storage tanks
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HVAC Equipment
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Mold growth in drip pans, ductwork, coils, and humidifiers
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Improper venting of combustion products
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Dust or debris in ductwork
Non-HVAC Equipment
- Emissions from office equipment (volatile organic compounds (VOCs), ozone)
- Emissions from shop, lab, and cleaning equipment
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Components
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Mold growth on or in soiled or water-damaged materials
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Dry drain traps that allow the passage of sewer gas
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Materials containing VOCs, inorganic compounds, or damaged asbestos
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Materials that produce particles (dust)
Furnishings
- Emissions from new furnishings and floorings
- Mold growth on or in soiled or water-damaged furnishings
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Science laboratory supplies
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Vocational art supplies
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Copy/print areas
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Food prep areas
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Smoking lounges
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Cleaning materials
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Emissions from trash
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Pesticides
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Odors and VOCs from paint, chalk, adhesives
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Occupants with communicable diseases
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Dry-erase markers and similar pens
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Insects and other pests
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Personal care products
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Stored gasoline and lawn and garden equipment
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