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In 2009, the city of Los Bernardinos ranked worst nationwide

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In 2009, the city of Los Bernardinos ranked worst nationwide [#permalink]

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New post 21 Aug 2013, 18:02
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In 2009, the city of Los Bernardinos ranked worst nationwide with 148 days of unhealthy air after a report was published by the Environmental Protection Agency. In early 2010, a series of pollution control measures were enacted by local government. Still, that year the city recorded smog alerts on 153 days and 160 days the following year. In 2012, however, the number of smog alerts in Los Bernardinos dropped to 118. Air pollutants from cars, buses and trucks, particularly ground-level ozone and particulate matter, can worsen respiratory diseases and trigger asthma attacks. These pollutants have been measured by gas spectrography from 2009-2012.

Which of the following statements, assuming that each is true, would be LEAST helpful in explaining the air pollution levels in Los Bernardinos between 2009 and 2012?

(A) The 2010 air pollution control measures enacted in Los Bernardinos were put into effect in 2012.

(B) In early 2012, the Pollution Control Board of Los Bernardinos revised the scale used to determine the amount of air pollution considered unhealthful.

(C) In early 2012, a new and far more accurate gas spectrometer was invented.

(D) In 2011, the mayor of Los Bernardinos 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 (some of the air pollution particulates measured) require a minimum of two years to break down naturally in the atmosphere above a given area.


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Re: In 2009, the city of Los Bernardinos ranked worst nationwide [#permalink]

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New post 22 Aug 2013, 11:15
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Must be (C)

(A) The 2010 air pollution control measures enacted in Los Bernardinos were put into effect in 2012. This will be helpful in understanding the sudden drop in the number of unhealthy days in 2012

(B) In early 2012, the Pollution Control Board of Los Bernardinos revised the scale used to determine the amount of air pollution considered unhealthful. If the scale level threshold was increased, then this statement would provide a reason for the drop

(C) In early 2012, a new and far more accurate gas spectrometer was invented. The catch here is that the spectrometer was invented but does not mention whether the city has used the same or not

(D) In 2011, the mayor of Los Bernardinos was found to have accepted large campaign donations from local industries and to have exempted those same industries from air pollution control measures. Since the industries are excluded, automatically the unhealthy days will come down

(E) Excess ozone and carbon monoxide (some of the air pollution particulates measured) require a minimum of two years to break down naturally in the atmosphere above a given area. This provides a clear info on the analysis provided above
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Re: In 2009, the city of Los Bernardinos ranked worst nationwide [#permalink]

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New post 23 Aug 2013, 03:06
I started reading from E -> A (since it's a "which of the following")

Which of the following statements, assuming that each is true, would be LEAST helpful in explaining the air pollution levels in Los Bernardinos between 2009 and 2012?

(E) Excess ozone and carbon monoxide (some of the air pollution particulates measured) require a minimum of two years to break down naturally in the atmosphere above a given area. (Hmm...maybe. It refers to the behavior of carbon monoxide, still not assured that THIS was a cause. Put a "?")

(D) In 2011, the mayor of Los Bernardinos was found to have accepted large campaign donations from local industries and to have exempted those same industries from air pollution control measures. (Definitely a cause, the industries were free to pollute)

(C) In early 2012, a new and far more accurate gas spectrometer was invented. (I asked myself: "So what?")

(B) In early 2012, the Pollution Control Board of Los Bernardinos revised the scale used to determine the amount of air pollution considered unhealthful.

(A) The 2010 air pollution control measures enacted in Los Bernardinos were put into effect in 2012.
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Re: In 2009, the city of Los Bernardinos ranked worst nationwide [#permalink]

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New post 28 Aug 2013, 16:16
Conclusion-->days of unhealthy days first decreased in 2012
Evidence--> 2010, unhealthy days increased to 153 days. 2011, unhealthy days increased to 160 days. In 2012, the number of smog alerts is Los Bernardinos dropped to 118
Assumption--> The pollution control measures did not have any effect on the environnement until 2012
A--Can be a reason for the unhealthy days increasing from 2009 to 2012 since nothing was done between 2009 to 2012 (Control measures were not put into effect until 2012)
B--if the amount of air pollution considered unhealthy was higher than it actually should be, the control measures put into effect would be ineffective or would have limited impact
C--Can have an effect but ????? (lets go through all the answer choices and then decide)
D--Because the large donors were exempt, they will continue to pollute the air
E--This is almost the same as the assumption
By elimination it is obvious that the answer is not A, B,D,E since they can all strongly support the assumption....
C is the answer
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Re: In 2009, the city of Los Bernardinos ranked worst nationwide [#permalink]

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New post 19 Sep 2014, 02:35
I have a question on how to choose between C and D.
D can explain why the pollution was high, but in 2011 it should have gone down...
What am I missing here?
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Re: In 2009, the city of Los Bernardinos ranked worst nationwide [#permalink]

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New post 20 Jul 2015, 08:45
In Choice B, It said that It has revised the scale, but it did not say whether it is increased or decreased. If it is increased the level (less strict) then it must have gone down in 2012. If its the opposite then the argument is not true. Hence I chose this answer. I can see that C is much stronger and its not linked with city at all.

Can anyone suggest why B is wrong?

Thanks,
G.
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Re: In 2009, the city of Los Bernardinos ranked worst nationwide [#permalink]

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New post 21 Jul 2015, 05:56
govind440 wrote:
In Choice B, It said that It has revised the scale, but it did not say whether it is increased or decreased. If it is increased the level (less strict) then it must have gone down in 2012. If its the opposite then the argument is not true. Hence I chose this answer. I can see that C is much stronger and its not linked with city at all.

Can anyone suggest why B is wrong?

Thanks,
G.


I see what you mean about B. They could have revised the scale for what is unhealthful. But that would require an assumption that the scale of pollutants measured by gas spectrography is the same scale as the health indicator scale. That is, the range of what is measured by spectrography may be much larger than the range of what is considered healthy.
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In 2009, the city of Los Bernardinos ranked worst nationwide [#permalink]

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New post 21 Jul 2015, 06:32
Why not D ?

The question stem wants an explanation that is LEAST helpful in explaining the drop.

D is exactly the opposite. If the industries were exempted, they might have continued to pollute and hence why would the levels drop?

On the other hand, C states that a new meter was invented. This option may still be able to explain the drop if we make further assumptions, although it may even help explain the opposite.

I am convinced that between C and D , C is better.

I think it is better to stick to the Official questions :-D :-D :-D :-D :-D :-D :-D
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Re: In 2009, the city of Los Bernardinos ranked worst nationwide [#permalink]

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Re: In 2009, the city of Los Bernardinos ranked worst nationwide [#permalink]

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New post 26 Aug 2016, 23:26
(E) Excess ozone and carbon monoxide (some of the air pollution particulates measured) require a minimum of two years to break down naturally in the atmosphere above a given area.

(E) says after 2 yrs the particles are break down helps to reduce but the release of ozone in every year could be same compensating what ever has been break down that year. No where it mentioned that the release of ozone is reducing year on year.
Means the levels of ozone or pollutants released are same every year and every year the break down is also normal so there is no increase or decrease.

Why cannot this be least one could explain the decrease of pollutants.

Please help me to correct my thought process
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Re: In 2009, the city of Los Bernardinos ranked worst nationwide [#permalink]

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New post 27 Aug 2016, 08:57
ravikrishna1979 wrote:
(E) Excess ozone and carbon monoxide (some of the air pollution particulates measured) require a minimum of two years to break down naturally in the atmosphere above a given area.

(E) says after 2 yrs the particles are break down helps to reduce but the release of ozone in every year could be same compensating what ever has been break down that year. No where it mentioned that the release of ozone is reducing year on year.
Means the levels of ozone or pollutants released are same every year and every year the break down is also normal so there is no increase or decrease.

Why cannot this be least one could explain the decrease of pollutants.

Please help me to correct my thought process


Yes, you have a point. Any reduction in pollutants should immediately reflect on the atmosphere, even though the pollutants may take 2 years or any period of time to break down since the cycle of pollutant addition and breaking down occurs continuously. Hence option E also does not help explain the pollutant level.
Re: In 2009, the city of Los Bernardinos ranked worst nationwide   [#permalink] 27 Aug 2016, 08:57
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