Chapter_21

Chapter_21 - Chapter21 Environment&Air Quality...

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Chapter 21 Quality Introduction Even though it is easier for life to exist without air than without water (many bacteria are anaerobic), humans can survive for about three days without water, but can only survive for about seven minutes without
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air (brain damage sets in after about three minutes). For humans, then, clean air is even more essential than clean water.
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Another issue involves purification of waste gases vs. purification of breathing air. It's far less intrusive on quality of life to purify water supply than air supply (we don't want to have to walk around outdoors in SCUBA gear). This relates back to first issue. Water can be purified and distributed at fixed locations for us to consume at our leisure. We don't have time to travel from place to place between breaths. In summary, it is even more imperative that we keep the air in earth's atmosphere clean than that we keep water in our environment clean. This chapter will focus on the chemistry of air pollution. Supply and demand for air are issues we hopefully will never have to face, and purification considerations will focus strictly on purification of waste gases in order to avoid rather than "fix" air pollution.
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Air Pollution AEROSOLS AND PARTICULATES Very small particles of dust, salt, polymer material, etc. suspended in air. Catalyze chemical reactions which create polluted air
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Chapter_21 - Chapter21 Environment&Air Quality...

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