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Lecture 5 - Ozone - Water Resources

Lecture 5 - Ozone - Water Resources - Indoor Air Pollution...

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Variety of substances: Smoke, chemicals, microbes, radon Different sources: Insulation materials, wood products, poisonous gases due to poor ventilation, cleaning chemicals, etc. People spend 90% of time in buildings that are tight, with filters and ventilation systems that are not maintained Commonly 2 to 5 times (sometimes 100 times) more polluted than outdoor air No indoor air pollution standards (EPA ranks indoor air pollution as fourth in cancer risk among top environmental problems) Indoor Air Pollution
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Ozone Layer Good ozone and bad ozone • O + O 2 O 3 Ozone layer is 15 to 40 km (10 to 25 miles) above surface in stratosphere Absorbs ultraviolet light (harmful to life) http://science.nasa.gov/headlines/y2006/26may_ozone.htm
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Chlorine atom splits from CFC, acts as catalyst in breakdown of ozone without being lost Cl + O 3 ClO + O 2 ClO + O Cl + O 2 In 1 to 2 years: one atom of Cl may destroy 100,000 molecules of ozone Used in refrigerants, fire extinguishers, industrial
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Lecture 5 - Ozone - Water Resources - Indoor Air Pollution...

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