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| 1 . |
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__________ pollutants are emitted directly from identifiable sources.
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| 2 . |
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With the passage of the federal __________ Act, as amended in 1970, major strides were made in reducing air pollution.
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| 3 . |
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Which one of the following is NOT a primary pollutant?
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| 4 . |
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The source of nearly half our pollution (by weight) is from the __________ category.
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| 5 . |
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A pH of 4 is __________ times more acidic than a pH of 5.
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| 6 . |
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The vertical distance between Earth's surface and the height to which convectional movements extend is called the __________.
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| 7 . |
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The major component of photochemical smog is __________.
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| 8 . |
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Two of the most important atmospheric conditions affecting the dispersion of pollutants are the strength of the wind and the __________ of the air.
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| 9 . |
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Which one of the following pollutants has shown the greatest percent decrease in concentration during the past years?
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| 10 . |
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This colorless, odorless, poisonous gas is the most abundant primary pollutant.
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| 11 . |
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Air pollution is likely to be most severe __________.
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| 12 . |
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The best-known effect of acid precipitation is the __________ of lakes and streams in eastern North America and Scandinavia.
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Answer choices in this exercise are randomized and will appear in a different order each time the page is loaded.
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