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

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Director
Joined: 11 Jun 2007
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In 1986, the city of Los Diablos had 20 days on which air [#permalink]

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26 Jul 2007, 23:13
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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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Senior Manager
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26 Jul 2007, 23:56
I think it is B

invention is irrelevant to usage
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AimHigher

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26 Jul 2007, 23:57
wow....this sounds confusing..

ok...i will go with D...because the way i understand it..according to D....the pollution level should actually go up in both 88 and 89 as few industries were exempted from pollution control measures.

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Senior Manager
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27 Jul 2007, 17:23
D for me too

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Director
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27 Jul 2007, 19:11
this one is tricky.. the OA is B and I still cant figure out the proper logic why...

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Director
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28 Jul 2007, 15:55
beckee529 wrote:
this one is tricky.. the OA is B and I still cant figure out the proper logic why...

In B, it says spectometer was "invented". So what? It says nothing about whether it was actually used to monitor pollution.

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Manager
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03 Aug 2007, 16:25
All of the statements are helpful, but B is least helpful, because while a more accurate instrument explains why levels went down in 1989, it doesn't explain why they went up in 87 and 88, after the enforcement was enacted. The same instrument would have been used in 86, 87, and 88.

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Director
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04 Aug 2007, 03:10
botirvoy wrote:
beckee529 wrote:
this one is tricky.. the OA is B and I still cant figure out the proper logic why...

In B, it says spectometer was "invented". So what? It says nothing about whether it was actually used to monitor pollution.

Well caught...this is a good question and the answer is B as explained above.

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04 Aug 2007, 03:10
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