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In 1986, the city of Los Diablos had 20 days on which air

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In 1986, the city of Los Diablos had 20 days on which air [#permalink] New post 30 Oct 2007, 11:44
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In 1986, the city of Los Diablos had 20 days on which air pollution reached unhealthful amounts and a smog alert was put into effect. In early 1987, new air pollution control measures were enacted, but the city had smog alerts on 31 days that year and on 39 days the following year. In 1989, however, the number of smog alerts in Los Diablos dropped to sixteen. The main air pollutants in Los Diablos are ozone and carbon monoxide, and since 1986 the levels of both have been monitored by gas spectrography.
Which of the following statements, assuming that each is true, would be LEAST helpful in explaining the air pollution levels in Los Diablos between 1986 and 1989?
(A) The 1987 air pollution control measures enacted in Los Diablos were put into effect in November of 1988.
(B) In December of 1988 a new and far more accurate gas spectrometer was invented.
(C) In February of 1989, the Pollution Control Board of Los Diablos revised the scale used to determine the amount of air pollution considered unhealthful.
(D) In 1988 the mayor of Los Diablos was found to have accepted large campaign donations from local industries and to have exempted those same industries from air pollution control measures.
(E) Excess ozone and carbon monoxide require a minimum of two years to break down naturally in the atmosphere above a given area
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 [#permalink] New post 30 Oct 2007, 12:10
the choice about the spectrometer. The question is about pollution, but this device only measures pollution and has not effect on the actual pollution in the air.
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Re: CR - Los Diablos [#permalink] New post 30 Oct 2007, 14:17
(D) In 1988 the mayor of Los Diablos was found to have accepted large campaign donations from local industries and to have exempted those same industries from air pollution control measures.

If the mayor excempted these Industries the pollution would have gone up!! not down
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 [#permalink] New post 30 Oct 2007, 20:24
(D)

Strictly going by the data presented in the passage, it's not clear that the local industries contributed to air pollution in the city (though in reality, they do).
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 [#permalink] New post 31 Oct 2007, 06:00
Answer is B
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 [#permalink] New post 31 Oct 2007, 07:02
Thanks Abis. I also thought it would be B, becasue inventing a new meter does not necessarely mean that it would be used right away for detection, it was just invented.

D-is wrong, and actually the worst choice in my opinion; if the mayor took the campaign bribe then that would show the most why the levels were so high. It implies that he completly ignored the atmosphere and let all the polutants polute becasue he got his money.
  [#permalink] 31 Oct 2007, 07:02
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In 1986, the city of Los Diablos had 20 days on which air

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