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Significant pollutant amongst automobile emissions is Nitrogen dioxide

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Significant pollutant amongst automobile emissions is Nitrogen dioxide [#permalink]

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New post Updated on: 01 Jan 2018, 21:18
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Significant pollutant amongst automobile emissions is Nitrogen dioxide. Devices designed to reduce nitrogen dioxide emissions, known as Catalytic converters, have been required in all new cars in Scotia since 2003, and as a result, nitrogen dioxide emissions have been significantly reduced throughout most of the country. Yet although the proportion of new cars in Scotia's capital city, New Durham, has always been comparatively high, nitrogen dioxide emissions there have showed only an insignificant decline since 2003.

Which of the following, if true, most helps to explain the insignificant decline in nitrogen dioxide emissions in Scotia's capital city?

A. Many Scotians who own cars made before 2003 have had catalytic converters installed in their cars.

B. Most car trips in Scotia's capital city are too short for the catalytic converter to reach its effective working temperature.

C. More of the cars in Scotia's capital city were made before 2003 than after 2003.

D. The number of new cars sold per year in Scotia has declined slightly since 2003.

E. Pollutants other than nitrogen dioxide that are emitted by automobiles have also been significantly reduced in Scotia since 2003.

Originally posted by shreyashid on 18 Feb 2016, 21:50.
Last edited by broall on 01 Jan 2018, 21:18, edited 2 times in total.
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Re: Significant pollutant amongst automobile emissions is Nitrogen dioxide [#permalink]

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New post 18 Feb 2016, 21:52
OA is B.
But I think it should be C. It is clearly mentioned that only new cars have the catalytic converter.
While in B- the functioning of the catalytic converter with regards to distance and effective temperature are not relevant and not mentioned in the passage.
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Re: Significant pollutant amongst automobile emissions is Nitrogen dioxide [#permalink]

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New post 19 Feb 2016, 00:13
I selected "C".
I think "B" would be correct for an assumption question type.
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Re: Significant pollutant amongst automobile emissions is Nitrogen dioxide [#permalink]

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New post 19 Feb 2016, 04:06
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Re: Significant pollutant amongst automobile emissions is Nitrogen dioxide [#permalink]

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New post 19 Feb 2016, 06:02
[quote="shreyashid"]Significant pollutant amongst automobile emissions is Nitrogen dioxide. Devices designed to reduce nitrogen dioxide emissions, known as Catalytic converters, have been required in all new cars in Scotia since 2003, and as a result, nitrogen dioxide emissions have been significantly reduced throughout most of the country. Yet although the proportion of new cars in Scotia's capital city, New Durham, has always been comparatively high, nitrogen dioxide emissions there have showed only an insignificant decline since 2003.

Which of the following, if true, most helps to explain the insignificant decline in nitrogen dioxide emissions in Scotia's capital city?

A. Many Scotians who own cars made before 2003 have had catalytic converters installed in their cars.
This does not explain the paradox.As,if converters were installed then N02 must decrease.

B. Most car trips in Scotia's capital city are too short for the catalytic converter to reach its effective working temperature.
Yes,we can keep this.Even if the cars have converters but they are not able to do their job.

C. More of the cars in Scotia's capital city were made before 2003 than after 2003.
Out of scope.

D. The number of new cars sold per year in Scotia has declined slightly since 2003.
Out of scope

E. Pollutants other than nitrogen dioxide that are emitted by automobiles have also been significantly reduced in Scotia since 2003.
out of scope.we only want to talk about NO2[/quote]

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Re: Significant pollutant amongst automobile emissions is Nitrogen dioxide [#permalink]

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New post 19 Feb 2016, 12:45
"C" should be the ans. B is out of scope.
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Re: Significant pollutant amongst automobile emissions is Nitrogen dioxide [#permalink]

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New post 19 Feb 2016, 19:40
sharmilaz87 wrote:
"C" should be the ans. B is out of scope.


and how can you define more?
Say before 2003 1000 cars were made but after 2003 900 cars were made.
If in all 1300 cars were sold then it could be that people preferred to buy cars made after 2003.
so 900(manufactured after 2003)+400(manufactured before 2003).
In this case cars manufactured after 2003 were being driven around by max buyers.

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Re: Significant pollutant amongst automobile emissions is Nitrogen dioxide [#permalink]

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New post 02 Mar 2016, 22:21
Let us identify the paradox first. Although all new cars in Scotia,since 2003, are required to have catalytic converters in the capital city of New Durham, the city with comparatively higher number of new cars, the decline in Nitrogen dioxide has been negligible. Any answer choice clarifying the reason behind this paradox is the answer. "B" clearly says that the trips made by the cars are so short that the converter does not even get a chance to function. Hence that is a possible explanation. If the converter does not work then it is obvious that the nitrogen dioxide will not decline even though the cars are new and are equipped with a converter. "C" goes against the fact because it is clearly stated that New Durham has comparatively higher number of new cars.
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Re: Significant pollutant amongst automobile emissions is Nitrogen dioxide [#permalink]

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New post 07 Mar 2016, 03:02
mahakmalik wrote:
sharmilaz87 wrote:
"C" should be the ans. B is out of scope.


and how can you define more?
Say before 2003 1000 cars were made but after 2003 900 cars were made.
If in all 1300 cars were sold then it could be that people preferred to buy cars made after 2003.
so 900(manufactured after 2003)+400(manufactured before 2003).
In this case cars manufactured after 2003 were being driven around by max buyers.

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good point, but what about the cars that are already running (or already bought before 2003). The fact that the percentage decline of NO2 emissions is negligible means that most of the NO2 emission comes from cars bought before 2003.
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Re: Significant pollutant amongst automobile emissions is Nitrogen dioxide [#permalink]

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New post 01 Jan 2018, 05:18
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It should be B.

For the simple reason that if the trips end before the Catalytic converters could start function, then it is equal to not installed.

In that case it is not effecctive and gives a reason why there is insignificant decrease in the level of No2.
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Re: Significant pollutant amongst automobile emissions is Nitrogen dioxide [#permalink]

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New post 01 Jan 2018, 08:13
IMO - B.

Which of the following, if true, most helps to explain the insignificant decline in nitrogen dioxide emissions in Scotia's capital city?

A. Many Scotians who own cars made before 2003 have had catalytic converters installed in their cars.
This option is opposite to the question. If old car owners have installed catalytic converters, we should expect more decline not less.[color=#00a651]

B. Most car trips in Scotia's capital city are too short for the catalytic converter to reach its effective working temperature.
Correct answer. If catalytic converter doesn't work for shorter trips and most of the trips are short. We can explain the insignificant reduction.

C. More of the cars in Scotia's capital city were made before 2003 than after 2003.
This could be an answer but the author has asked about in proportion to the new car sold. Hence not so relevant.

D. The number of new cars sold per year in Scotia has declined slightly since 2003.
Very similar to option C explanation. Just talking about in proportional reduction.

E. Pollutants other than nitrogen dioxide that are emitted by automobiles have also been significantly reduced in Scotia since 2003.
Author is talking about nitrogen dioxide reduction so irrelevant.
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Re: Significant pollutant amongst automobile emissions is Nitrogen dioxide [#permalink]

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New post 01 Jan 2018, 10:46
Catalytic converters are a must from 2003.But there is a good chance that many of the cars made before 2003 might have had catalytic converters installed in them. Since C cannot avoid this criticism,the answer should be B.

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Re: Significant pollutant amongst automobile emissions is Nitrogen dioxide   [#permalink] 01 Jan 2018, 10:46
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Significant pollutant amongst automobile emissions is Nitrogen dioxide

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