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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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26 Apr 2005, 08:31
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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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26 Apr 2005, 09:54
B) In December of 1988 a new and far more accurate gas spectrometer was invented. => this is not important, because we dont know whether this spectroblablabla was used. we only know that is was invented.
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26 Apr 2005, 10:25
what D has to do than? how exemption of industry is related to measure of pollution?
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26 Apr 2005, 10:46
for D
in 1988 the industry were exempted--- therefore the high levels of the smog alert (39 in number).

note that pollution measures were initiated in 1987, which restricts the amount of pollutants an industry can emit. so if the industries are exempted from the restriction then they will not employ the various expensive pollution control methods,which they would have to employ if the restrictions persisted.

D helps us to understand why the smog alert were higher in number for the year 1988 and therefore can not be the answere.

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26 Apr 2005, 12:49
I think (D) is the least helpful in understanding the pollution pattern.

As per (D) the pollution level should increase after 1988. But it did not.

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Re: CR: Pollution level [#permalink]

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27 Apr 2005, 00:22
(B) is close because the new spectrometer may have corrected faults of the old one and thereby increase (or even decrease) the no. of smog alerts. WE are not sure about it's effect on smog alerts.

(D) is my answer because it completely fails to explain the trend given in the stimulus. If many industries were exempted then it makes sense to believe that the no. of smog alerts will drop, perhaps rapidly.

(D) for me.

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27 Apr 2005, 07:05
anandnk wrote:
I think (D) is the least helpful in understanding the pollution pattern.

As per (D) the pollution level should increase after 1988. But it did not.

Hi,

choice D does explain why in 1988 the alert increased. Maybe in 1989 those industries exemped were not allowed to emit; thus choice D does explain the decrease of alerts in 1989.

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27 Apr 2005, 07:20
Hi, I don't know whether the measure enacted was to prevent the air pollution or to display alerts.

if the measure enacted was to prevent the air pollution, then the alert would decrease after the measure was enacted. Then choice A is the OA. Because the measure was enforced in 1987; however, the alert in 1988 increased.

what's wrong with A?

(B) In December of 1988 a new and far more accurate gas spectrometer was invented.
id does explain the increase in 1988

(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.

it may explain the decrease in 1989, because the scale became loose.
(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.
it does explain the increase in 1989.

(E) Excess ozone and carbon monoxide require a minimum of two years to break down naturally in the atmosphere above a given area.

it does explain the increase from 1987 to 1989 after the measure was enacted.

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27 Apr 2005, 08:33
anandnk wrote:
I think (D) is the least helpful in understanding the pollution pattern.

As per (D) the pollution level should increase after 1988. But it did not.

but the exemptions were only for 1988, after 1988 the restrictions were imposed again.

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27 Apr 2005, 08:56
chunjuwu wrote:

(B) In December of 1988 a new and far more accurate gas spectrometer was invented.

but the spectrometer was ONLY invented. we dont know if it was used. in cannot be A) cause if the measures were put into effect in nov 88, it is a reason why the pollution level increased so late, because before there were no restrictions.
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27 Apr 2005, 09:06
gotta be "B"....invention of XYZ doesn't mean anything, there is no indication that the new spectrometer was used in measurements.

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27 Apr 2005, 18:31
banerjeea_98 wrote:
gotta be "B"....invention of XYZ doesn't mean anything, there is no indication that the new spectrometer was used in measurements.

S&^%, I dont when I am going to learn from my mistakes.

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28 Apr 2005, 19:35
OA is D.
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28 Apr 2005, 20:55
what's the source of this CR and does that have any OE ? Thx

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28 Apr 2005, 20:55
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# In 1986, the city of Los Diablos had 20 days on which air

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