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

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12 May 2009, 22:07
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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.
[Reveal] Spoiler: OA
If you have any questions
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29 Jul 2010, 08:17
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ImJun wrote:
dont look too much into it, it's D trust me

A lot of people vote for D, I am as well. Source is 1000 series of CR questions.
This is badly constructed CR question, because a lot of people stuck on B/D answer choice. Here is a lot to assume either in B or D.

Here is the comment from a canadian istructor who scored 800.

"Who cares?
This is a garbage 1000cr question. You may as well have some random person design a question, and then feel bad because you can't choose between two answers. Practicing on these questions can HURT you more than it can help you.
rce be
People think more questions, more practice, better off. But if the kind of questions you are working on the are badly designed then a reason for why a right answer is right or why a wrong answer is wrong may not even be applicable on real GMAT questions. You might take away learnings that are bad information on the real test!"
(source beatthegmat.com)
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Re: In 1986, the city of Los Diablos had 20 days on which air [#permalink]

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14 Mar 2013, 06:30
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TheNona wrote:
still not quite convinced with B

Hi TheNona,

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.

The question asks us to find an answer choice that is LEAST helpful in explaining the pollution levels between 1986 and 1989. (B) may explain why the smog alerts decreased in 1989, but it will not explain the rise in pollution level in 1987 or 1988.

(D) on the other hand helps to explain the levels, because the Mayor "was found" to have accepted donations and exempted industries from pollution control measures. In 1988 it was found, so it is possible that he could have been taking donations in the past also; it could explain the pollution levels in 1987 and 1988. Thus, (D) explains.

Hope this helps,

Vercules
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14 May 2009, 08:46
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I recall this question and

The OA is B apparently, because even though the gas spectometer was invented, it doesn't mean it was used.

But I'm still sticking with D!
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01 Mar 2014, 10:00
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I recall this question and

The OA is B apparently, because even though the gas spectometer was invented, it doesn't mean it was used.

But I'm still sticking with D!

B is right

Firstly, Argument is asking about variation in pollution level from 86 to 89
and What measure do we have in argument - number of occurrences/ frequency of alert days on which air pollution reached unhealthful amounts and a smog alert was put into effect. (highlighted part is in the first line of arg.)

Secondly, What's wrong with D - if some industries are getting exemption "from air pollution control measures."
Then, surely frequency will be affected.

B is right just because of what 'bigfernhead' has mentioned about B.
Hope it helps !
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Re: In 1986, the city of Los Diablos had 20 days on which air [#permalink]

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05 Mar 2014, 01:46
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B, it's the right answer. B said that a new gas spectrometer was invented, but we dont know if it was used!!!
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12 May 2009, 22:25
D

if D were true then why is there a decrease in pollutants in 1989, there should have been an increase
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13 May 2009, 02:26
bigtreezl wrote:
D

if D were true then why is there a decrease in pollutants in 1989, there should have been an increase

Yes, but it's not OA

I wanna check more posts before deciding whether the OA is wrong..
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13 May 2009, 06:30
Minheequang 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) Explains why number reduced on 1988
B) This does not. If more accurate then the numbers should have increased.
C) Explains. Now new threshould is there, which maybe greater than the previous one.
D) Explains. Since companies exempted from air pollution measures, hence the decrease.
E) Since min 2 years required to break down the pollutants, hence the effects seen after 2 years..

IMO B
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13 May 2009, 06:46
I also selected B initally. but bigtreezl is drawing be to D.

(B) In December of 1988 a new and far more accurate gas spectrometer was invented. (I belive this does not give any explaination for the pollution b/w 1986 to 1989 )
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13 May 2009, 06:57
imanonymoususer wrote:
Minheequang 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) Explains why number reduced on 1988
B) This does not. If more accurate then the numbers should have increased. -->From which info can you say that it will increase ? I can assume that because a new monitor machine is more accurate, it will prove less smog alert case which otherwise will prove positive. The initial problem in this case is that the control measures didn't work, but a new spectrometer helps solve the problem
C) Explains. Now new threshould is there, which maybe greater than the previous one.
D) Explains. Since companies exempted from air pollution measures, hence the decrease. --> I don't think so. A number of companies are exempted from controlled pollution measures, it means that such companies will pose more pollution. So why does the case of smog alert become fewer ? --> it strengthens the discrepancy
E) Since min 2 years required to break down the pollutants, hence the effects seen after 2 years..

IMO B
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14 May 2009, 08:51
I recall this question and

The OA is B apparently, because even though the gas spectometer was invented, it doesn't mean it was used.

But I'm still sticking with D!

wow, what a dirty trick! good question though
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14 May 2009, 10:48
IMO D too
If some companies are exempted, it is not going to bring pollution levels down
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14 May 2009, 17:04
Anyone else ?

There's one more thing that makes D the best answer: "in 1988" --> indefinite time, so I can assume that it happened at the early 1988, affecting the whole year 1988 and 1989, but why the 2 year had 2 different outcome ?
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17 May 2009, 00:07
Minheequang wrote:
imanonymoususer wrote:
Minheequang 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) Explains why number reduced on 1988
B) This does not. If more accurate then the numbers should have increased. -->From which info can you say that it will increase ? I can assume that because a new monitor machine is more accurate, it will prove less smog alert case which otherwise will prove positive. The initial problem in this case is that the control measures didn't work, but a new spectrometer helps solve the problem
C) Explains. Now new threshould is there, which maybe greater than the previous one.
D) Explains. Since companies exempted from air pollution measures, hence the decrease. --> I don't think so. A number of companies are exempted from controlled pollution measures, it means that such companies will pose more pollution. So why does the case of smog alert become fewer ? --> it strengthens the discrepancy
E) Since min 2 years required to break down the pollutants, hence the effects seen after 2 years..

IMO B

Agreed that introduction of new spectrometer could have also cause less smog alerts.
All the more reason why it "LEAST" explains the air pollution levels.
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21 May 2009, 06:46
what's the final OA?!
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21 May 2009, 06:56
prinits wrote:
what's the final OA?!

OA is B, which I'm struggling against
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22 May 2009, 23:01
I am not convinced on B. D is my choice becuase whether the new meter is used is beyond the argument.
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05 Mar 2010, 06:59
I still like D.
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05 Mar 2010, 10:20
The questions is "what would be LEAST helpful in explaining the air pollution levels" and D is not at all helping in explaining, it is rather helping to weaken the conclusion. I am convienced with B (though didn't ans at) because it is the LEAST likely reason for the decrease.
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Re: Los Diablos   [#permalink] 05 Mar 2010, 10:20

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