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Chapter 25

Chapter 25. Indoor Air Pollution. Concentrations of common indoor pollutants compared with outdoor concentrations. Some Sources of Indoor Air Pollution. Secondhand smoke Legionella pneumophila (bacteria) found in pools of stagnant water in air ducts Mold Radon Gas Pesticides Dust Mites

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Chapter 25

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  1. Chapter 25 Indoor Air Pollution

  2. Concentrations of common indoor pollutants compared with outdoor concentrations.

  3. Some Sources of Indoor Air Pollution • Secondhand smoke • Legionella pneumophila (bacteria) found in pools of stagnant water in air ducts • Mold • Radon Gas • Pesticides • Dust Mites • Pet Dander

  4. More Sources of Indoor Air Pollution • Abestos: fireproofing • Aerosols: air fresheners, etc. • CO: gas heaters • PM’s: fireplaces • O3: photocopiers

  5. Pathways, Processes and Driving Forces • Chimney Effect (Stack Effect) • Process whereby warmer air rises in buildings to upper levels and is replaced in the lower portion of the building by outdoor air drawn through a variety of openings, such as windows doors or cracks in the foundation or walls • Generally occurs when there is a temperature difference between indoor and outdoor environments.

  6. Sick Building Syndrome • A condition associated with an indoor environment that appears to be unhealthy • The symptoms people report cannot be traced to any one particular cause…making it difficult to diagnose • Headache, itchy eyes, vomiting, skin irritations, troubles breathing, dizziness, nosebleeds, abdominal pain etc.

  7. Massachusetts RMV • Employees moved into new building in 94’ • Complaints of unpleasant odors, fatigue, itchy eyes, headaches, respiratory problems • Cause turned out to be poor ventilation & construction that caused fireproofing material to be carried throughout the building

  8. Environmental Tobacco Smoke • Secondhand smoke • 2 sources • Smoke exhaled by smokers • Smoke emitted from burning tobacco • The most hazardous indoor pollutant

  9. Radon Gas • Radon • Naturally occurring radioactive gas • Colorless, odorless, tasteless • Only identified through proper testing • Causes CANCER (lung) • Health hazard when leaked into homes • Exposure is associated with lung cancer

  10. Radioactive decay for radon. Radon is a gas that can move up from rock or soil and into the air.

  11. Control of Indoor Air Pollution Ventilation Source Removal Source Modifications Air Cleaning (pollutant removal) Education

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