1986, the city of Los Diablos had 20 days on which air : GMAT Critical Reasoning (CR)
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# 1986, the city of Los Diablos had 20 days on which air

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

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10 Dec 2007, 16:07
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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: CR1000 - Air Pollution [#permalink]

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10 Dec 2007, 16:15
cstefanita wrote:
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.

E!
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11 Dec 2007, 16:22
Not E - anyone else?
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11 Dec 2007, 23:33
I would go for D
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Re: CR1000 - Air Pollution [#permalink]

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12 Dec 2007, 00:25
it's B.

It doesn't explain why the number of smog alerts dropped.
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12 Dec 2007, 10:00
B is the correct answer but I still don't get it

What if the reason number of alerts went down is that the older, pre Dec '88 device, was counting more alerts than it should have?
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Re: CR1000 - Air Pollution [#permalink]

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08 Jan 2008, 13:22
Picked D as well, but apparently this answer is wrong. Why?
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08 Jan 2008, 20:09
cstefanita wrote:
B is the correct answer but I still don't get it

What if the reason number of alerts went down is that the older, pre Dec '88 device, was counting more alerts than it should have?

I would like to know this as well. I understood this question at one time but have forgotten why B is correct.
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Re: CR1000 - Air Pollution [#permalink]

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08 Jan 2008, 22:50
Why B?
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Re: CR1000 - Air Pollution [#permalink]

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09 Jan 2008, 12:04
cstefanita wrote:
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.

I vote for B.
1986: air pollution in 20 days.
1987: new air pollution control measures were enacted. Air polluion in 31 days.
1988: air pollution in 39 days.
1989: drop to 16 days.
Air pollutant: ozone and carbon monoxide, and since 1986 the levels of both have been monitored by gas spectrography.

The question asked us about the LEAST explanation. We can see my summary, from 1986 to 1988, the air pollution increases. However, in 1989, it drops. However, in B, it is said that "In December of 1988 a new and far more accurate gas spectrometer was invented." This sentence cannot explain why air pollution in Las... drops in 1989. Because, in 1987, the law was enacted, but is does not help. Air pollution in 1987 and 1988 increases. In the end of 1988, new gas was invented, but in 1989, air pollution dropped. This is the best answer.

A helps to explain the argument.
C and E are irrelevant.
D is too general.
Re: CR1000 - Air Pollution   [#permalink] 09 Jan 2008, 12:04
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