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 Sep 2005, 11:11
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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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Re: CR: Los Disblos air pollution [#permalink]

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27 Sep 2005, 11:34
D, all others can be easily rejected
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27 Sep 2005, 12:13

Even though industries are exempted from air pollution control measures, it does not mean industries will release less pollutants. Therefore, it can not explain why the number of smog alerts in Los Diablos dropped from previous years.
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27 Sep 2005, 13:48
(A)If the control mesures were put into effect in November 1988, then the levels can be explained.

(B)Nothing is stated about whether the new spectrometer was used in the Diablos. However one can guess it was used.

(C)If the scale was revised, the level at which the alert starts could have been increased.

(D)If some industries were releasing pollutants but without control, the levels mesuared couldn't have detected them, so it doesn't explain the differents levels between 1986 and 1988

(E)It expains the levels.

I pick D[/quote]
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27 Sep 2005, 18:36
I pick D too.
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27 Sep 2005, 21:41
Another vote for D
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29 Sep 2005, 12:49
I think it's B

If in 1988 a more accurate gas spectrometer was invented, this would enable them to detect more instances of ozone and carbon monoxide, not less.

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29 Sep 2005, 13:15
Clear D for me.
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hey ya......

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29 Sep 2005, 21:25
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29 Sep 2005, 21:46
If industries are exempted, the pollution levels might increase. It would contradict the fact that the level dropped in 1989.
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29 Sep 2005, 22:52
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30 Sep 2005, 01:32
I also choose D
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30 Sep 2005, 01:41
B is my pick.

It cannot be D because, if the mayor has exempted certain companies from adhering to pollution norms, then those companies are free to release as much gas as they choose to.

B says there was an invention. But we do not know the use of this invention and we do not know whether this invention was implemented.

So its a vrey clear B!
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30 Sep 2005, 12:33
I wud pick B.

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04 Oct 2005, 14:35
D for me too, what is the OA please?
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Thanks!

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04 Oct 2005, 16:08
I wuld go with "B".

D - explains in someway that exemption given by Mayor can cause decline in polution levels

B - No way releated to passage. No where mentioned that new invention is used. So, it LEAST explains the pollution levels/
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04 Oct 2005, 16:37
The best choice is B. B is the only one that could not explain why the number of cases went up in 1988 to 39, and then dropped in 1989 to 16. If the new gas spectograph resulted in a more stringent test, then in 1988, the number of smog alerts should have shown a decline compared to 1987. If the new gas spectograph was relaxed, then we can't explain why in 1989 the number of smog alerts went down compared to 1988.

D is not good. It explains fully when 1988 had more smog alerts compared to 1987, and it also provides an explanation why 1989 showed a massive decline compared to 1988 and 1987.

B for me.
04 Oct 2005, 16:37
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