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

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Director
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In 1986, the city of Los Diablos had 20 days on which air [#permalink] New post 08 Nov 2006, 04:19
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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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 [#permalink] New post 08 Nov 2006, 04:37
B !
Director
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 [#permalink] New post 08 Nov 2006, 05:56
Can you please give reason for your choice...The OA is B

Why is D wrong..
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 [#permalink] New post 08 Nov 2006, 06:48
vineetgupta wrote:
Can you please give reason for your choice...The OA is B

Why is D wrong..


D is helpful because, the information explains to a certain extent the shifts in numbers. I agree...D is not explaining fully. However, it is providing explanation of why it went up from 31 days to 39 days.

B says in December of 1988 a new and far more accurate gas spectrometer was invented. How does that matter? Was this new spectrometer used in the city? We are not sure :wink:
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 [#permalink] New post 08 Nov 2006, 07:30
We have seen this in the past. It's only B.

The new invention does not say more about its use on this case.
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 [#permalink] New post 08 Nov 2006, 08:00
OA may be (B) but I still can not rationalize it. What does spectrometer does? It monitors the level of pollutants. As soon as we introduced a new
spectrometer in Dec 88, we see the result (may be previous spectrometers were screwed up?).

To me (D) makes sense...
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 [#permalink] New post 09 Nov 2006, 07:10
asaf wrote:
OA may be (B) but I still can not rationalize it. What does spectrometer does? It monitors the level of pollutants. As soon as we introduced a new
spectrometer in Dec 88, we see the result (may be previous spectrometers were screwed up?).

To me (D) makes sense...


Yup INVENTED (NOT USED) in (B) is something I missed...
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 [#permalink] New post 09 Nov 2006, 20:27
D ! see my explanation in a previous post ...
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 [#permalink] New post 09 Nov 2006, 23:02
Clear B
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  [#permalink] 09 Nov 2006, 23:02
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