Environmental Public Health Division

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BIOLOGICAL POLLUTANTS -animal dander, dust mites and cockroach parts, fungi (molds), mildew, infectious agents (bacteria or viruses), cat saliva, rodent droppings, and pollen

Biological pollutants are in every home and are hard to get rid of. Two conditions are essential to support biological growth: nutrients and moisture.

Sources: Wet or moist walls, ceilings, carpets, furniture, poorly maintained humidifiers and air conditioners, bedding, household pets, firewood, house plants, water leaks around tubs and sinks, dust and dirt.

Health Effects: Eye, nose, and throat irritation, shortness of breath, itching, coughing, dizziness, lethargy, fever, digestive problems, allergic reactions, asthma, humidifier fever, influenza and other infectious diseases.

Remediation

• Install and use exhaust fans vented to outdoors in kitchens and bathrooms. Vent clothes dryers to outdoors
• Repair leaks and seepage
• Maintain routine household cleaning and dusting regularly.
• Empty water trays in dehumidifiers and refrigerators frequently.
• Clean and dry or remove water-damaged carpets, ceiling tiles, and furniture.
• Change central air conditioning and heating filters monthly or as needed; clean coils and incline drain pans
• Clean air ducts every 3-5 years
• Ventilate attic and crawlspaces
• Wash bedding and soft toys in hot water min. 130°f to kill dust mites
• provide a vapor barrier (plastic sheeting) over dirt in crawlspaces or between concrete floor and carpeting to prevent moisture problems
• Increase air circulation by using fans, move furniture from wall corners, open doors between rooms including closets
• Remove visible mold and clean surfaces with a mild bleach solution
• Remove organic debris and bird droppings away from fresh air supply vents
• Eliminate indoor insects/pests and remove droppings etc.

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Last updated:  March 17, 2010 
Harris County Public Health & Environmental Services
2223 West Loop South
Houston, TX 77027
Tel: (713) 439-6000
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