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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] New post 26 Dec 2005, 22:09
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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 26 Dec 2005, 22:14
IMHO D
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 [#permalink] New post 26 Dec 2005, 22:25
I will go with B

The fact that a gas spectrometer was invented doesn't explain the pollution levels. If it was used, then maybe its another story
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 [#permalink] New post 26 Dec 2005, 22:33
ArriveD at D after kicking out A.

We need to explain why:
1. Number of alerts were high in 87 & 88
2. Number if alerts decreased in 89

A/B/C/E may help in explaing #1 and/or #2.

D is not relevent.
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 [#permalink] New post 27 Dec 2005, 00:09
giddi77 wrote:
ArriveD at D after kicking out A.

We need to explain why:
1. Number of alerts were high in 87 & 88
2. Number if alerts decreased in 89

A/B/C/E may help in explaing #1 and/or #2.

D is not relevent.


I agree it should be D.
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 [#permalink] New post 27 Dec 2005, 01:14
This should be 'B'.

It talks only about "new spectrometer", where does it talk about this "spectrometer" was used in 1989?

It is clearly 'B', it doesn't explain/talk anything about increase or decrease in the pollution levels!
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 [#permalink] New post 27 Dec 2005, 01:16
Could exemptions (for industry who gave donations) from the pollution control measures lead to an increase of pollution? Yes they can.

Therefore D is out for the least helpful...

I think it's B
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 [#permalink] New post 27 Dec 2005, 02:38
I think it is B
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 [#permalink] New post 27 Dec 2005, 08:45
B.

The new spectro is more accurate. But we cannot infer that the old spectro is NOT accurate enough to give wrong readings. We can only say the old spectro is less accurate.

Not confident thou...

OA?
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 [#permalink] New post 27 Dec 2005, 08:53
OA is B
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 [#permalink] New post 27 Dec 2005, 11:18
TeHCM wrote:
I will go with B

The fact that a gas spectrometer was invented doesn't explain the pollution levels. If it was used, then maybe its another story



Good catch TeHCM!!

Moral of the story:
1. Read carefully. Take a HAMMER and try to BEAT up each of the choices
2. Don't apply YOUR knowledge of the subject :x
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"To dream anything that you want to dream, that is the beauty of the human mind. To do anything that you want to do, that is the strength of the human will. To trust yourself, to test your limits, that is the courage to succeed."

- Bernard Edmonds

  [#permalink] 27 Dec 2005, 11:18
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