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

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27 Oct 2006, 04:31
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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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27 Oct 2006, 05:15
Its B
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27 Oct 2006, 05:58
I'm confused between B and D - but i am leaning towards D. THere's no reason to believe the companies from which the mayor took donation were causing pollution in the first place or that exempting them from pollution control measures could have contributed to the pollution increase in 1988.

On the other hand B says a more accurate spectrometer was invented - it is reasonable to assume may be the pollution control measures enacted in 1987 were helpful but the old spectrograph just wasn't accurate enough and the new spectrograph recorded pollution more accurately and gave teh correct picture.
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27 Oct 2006, 06:00
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.
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27 Oct 2006, 06:46
(D)

If (D) is true then the smug alerts should have been low for both 1988 and 1989,and not only for 1989.
Does not explain for 1987 ?
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27 Oct 2006, 21:27
arjsingh1976 wrote:
Its B

Just curious. Why did you choose B? That doesn't mean B is the answer
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27 Oct 2006, 22:58
I got B too. Invention of more accurate gas spectrometer is irrelvent here.
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28 Oct 2006, 00:32
I'll pick B too ... the new instrument was invented ... so what ? argument doesn't say that it was actually used to monitor the polution level ....

D is wrong because mayor allowed some of his sponsors to pollute and thus the smog level went up .... it definitely explains some part of the paradox.

This smells like a LSAT CR ...
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28 Oct 2006, 20:28
Swagatalakshmi wrote:
I'll pick B too ... the new instrument was invented ... so what ? argument doesn't say that it was actually used to monitor the polution level ....

D is wrong because mayor allowed some of his sponsors to pollute and thus the smog level went up .... it definitely explains some part of the paradox.

This smells like a LSAT CR ...

Good analysis

OA is B.

The question is from CR 1000.
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28 Oct 2006, 20:28
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# In 1986, the city of Los Diablos had 20 days on which air

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