In 1986, the city of Los Diablos had 20 days on which air : GMAT Critical Reasoning (CR)
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# In 1986, the city of Los Diablos had 20 days on which air

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

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31 Mar 2006, 19:30
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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.

I did'nt get this one right but I seriously question the OA's aunthenticity. Can someone please help me out with this?
If you have any questions
New!
VP
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01 Apr 2006, 04:18
I wud say E..

Since it takes 2 Years... It does not explain how the Smog of 1988 would suddenly disappear!
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01 Apr 2006, 04:18
Whats is the OA?
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01 Apr 2006, 04:28
Is the OA E?

E seems to be remotely helpful in explaining the air pollution.
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01 Apr 2006, 04:47
Not sure.. thats the only thing that made sense 2 me!
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01 Apr 2006, 09:59
I would say the answer is B. E says it takes 2 years for the carbon monoxide to breakdown. The law was enacted in 1986 and the levels on CO continued to decline so E is relevant to information to the declining levels of CO.

I think the answer is B because it doesn't matter how accurate the CO meters are. If the less accurate meters are used in 1986 and these meters are still used in 1987, the measurement of CO will still be inaccurate by the same magnitude.

Does this help? I did score so well on the verbal so that is why I am here
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02 Apr 2006, 20:32
OA is E. Well done sm176811! Now I understand, Since CO takes 2 years to decompose anyway, it does not help explain why the levels increased and then dropped. Cool! Thanks!
02 Apr 2006, 20:32
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