Chapter 10.pptx - Air Quality Chapter 10 The Killer Smog...

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Air Quality Chapter 10:
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The Killer Smog Deadly air pollution Donora, Pennsylvania, 1948 Zinc-smelting factory – sulfur compounds, heavy metal dusts, nitrogen oxide, carbon monoxide, fluorine etc. Smog common in urban cities Weather conditions trapped smog for days 20 dead -day and 50 - month, thousands ill Led to the Air Pollution Act of 1955 and Clean Air Act of 1967
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Air quality Gases and small particles in atmosphere that influence ecosystems or human well-being Air pollution Gases or particles that are in high enough concentrations to harm humans well being, organisms, or structures
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Gases of atmosphere Nitrogen (N 2 ), oxygen (O 2 ), argon (Ar) over 99% of atmosphere Trace gases Present in concentrations of parts per million Some stable- Helium Others vary widely in place and time- H 2 O, CO 2 VOCs organic organic compounds that can vaporize in the air - CH 4 Particulate matters Small solid or liquid particles suspended in the air. Called as aerosols
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Larger particles fall out of the air faster than do smaller particles. Particles that are suspended in air
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Natural- Volcanic eruptions- Sulfur Radon sea salt, pollen Anthropogenic – Primary & Secondary Primary air pollutants - Chemicals or particles directly released in air Sulfur dioxide (SO 2 ) Nitrogen oxides (NO x ) Carbon monoxide (CO) Hydrocarbons - Methane (CH 4 ), Butane (C 4 H 10 ), Propane (C 3 H 8 ) Hydrogen sulfide (H 2 S) Hydrogen fluoride (HF) Particulate matter Asbestos, Lead, and Mercury CFCs Sources of Air pollution
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Secondary air pollutants Chemicals and particles that are formed by reaction of other chemicals or aerosols in the atmosphere Ozone (O 3 ) NO Smog Photochemical air pollutants Secondary pollutants facilitated by sunlight
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Forming a Secondary Pollutant
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Creation of Photochemical Smog
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Photochemical Smog-- Hong Kong
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London in 1952
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Los Angeles on a . . . Clear Day Smoggy Day
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Air Quality and Air Pollution
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Pollution Point sources Stationary, localized sources Smoke stacks Non-point sources Numerous sources that produce a relatively small amount Cars, residential fireplaces
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Air Determined by three main factors
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