CR 1000: Air pollution in Los Diablos : GMAT Critical Reasoning (CR)
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# CR 1000: Air pollution in Los Diablos

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CR 1000: Air pollution in Los Diablos [#permalink]

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31 Oct 2007, 22:45
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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 1000: Air pollution in Los Diablos [#permalink]

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01 Nov 2007, 06:04
vsaxena wrote:

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.

A- helps to prove why smog alerts dropped to 16 in 1989
B- helps to prove why smog alerts dropped to 16 in 1989
C- helps to prove why smog alerts dropped to 16 in 1989
D- does not help because statement does not tell what kind of industries were exempted whether they had any effect on air-pollution before exemption
E- helps to prove why smog alerts dropped to 16 in 1989

My take is D.
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01 Nov 2007, 06:12
Wow, this is a tough one.

A cannot be right since it explains the act was put in the effect in 1988, therefore, in 1989 the level starts to decrease.

B might not be right since the invention of the new and more accurate spectrometer could measure the pollutant level more accurately, therefore cause the level to decrease.

C cannot be right because some of the pollutants were count as unhealthful before might not count as unhealthful according to the new scale, therefore explains the level

D cannot be right because some of the industries were not accounted for as pollution control measure, therefore the level dropped

E, I don't know. This is the only chose left I might choose if it is on a test day although it does seem somehow related as well. It is the word excess made me uncomfortable here.

But this is just my 2 cents. Open to discussion.
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01 Nov 2007, 06:21
eileen1017 wrote:
Wow, this is a tough one.

A cannot be right since it explains the act was put in the effect in 1988, therefore, in 1989 the level starts to decrease.

B might not be right since the invention of the new and more accurate spectrometer could measure the pollutant level more accurately, therefore cause the level to decrease.

C cannot be right because some of the pollutants were count as unhealthful before might not count as unhealthful according to the new scale, therefore explains the level

D cannot be right because some of the industries were not accounted for as pollution control measure, therefore the level dropped

E, I don't know. This is the only chose left I might choose if it is on a test day although it does seem somehow related as well. It is the word excess made me uncomfortable here.

But this is just my 2 cents. Open to discussion.

Question asks if statement is true (so think of it as true, either it makes sense or not) which is the LEAST helpful. Now analyze all options considering option is true, does it help to explain the behavior between 86-89?
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Re: CR 1000: Air pollution in Los Diablos [#permalink]

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01 Nov 2007, 18:59
vsaxena wrote:

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.

My say is B. I think ive seen this b/f.
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01 Nov 2007, 22:05
Thank you all for sharing your thoughts. The OA is 'B'.

Actually if we reconsider the answer choices, all except 'B' tend to support the explaination for pollution levels between 1986 and 1989. We need to choose the LEAST relevant explaination for the pollution levels.

My explaination for D- Smog alerts in 1988 might have increased because of relaxed pollution control measures extended to the specific industries by the mayor.

My explaination for B- The spectrometer invented in Dec 1988 was far more accurate. But does it explain the "falling" pollution level in 1989. An accurate spectrometer may as well record 40 instead of 16!!
01 Nov 2007, 22:05
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# CR 1000: Air pollution in Los Diablos

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