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

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3) In 1986, the city of Los Diablos had 20 days on which air [#permalink]

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23 Mar 2007, 15:13
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3) 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.

OA is B. I went for D. What is wrong with D?? It actually contradicts with the conclusion of the arguement.
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23 Mar 2007, 18:06
I think in B, it is unclear whether the measured smog alert days prior to the invention of the new spectrometer were simply inaccurate because they were measured using a less accurate spectrometer. Both old and new spectrometers could be accurate enough to measure smog days correctly and enhanced accuracy may affect other aspects more....

In D, although the new air pollution control measures were in enacted in 1987, even greater number of days (39) had smog alerts in 1988 because the mayor exempted those industries from air pollution control measures and those industries were free to produce more pollution. This could perhaps explain why despite the new measures, smog days increased in number in 1988.

What is the conclusion of the argument?
23 Mar 2007, 18:06
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