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Houses built during the last ten years have been found to contain indo

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Houses built during the last ten years have been found to contain indo  [#permalink]

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New post 27 Dec 2018, 13:07
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Houses built during the last ten years have been found to contain indoor air pollution at levels that are, on average, much higher than the levels found in older houses. The reason air-pollution levels are higher in the newer houses is that many such houses are built near the sites of old waste dumps or where automobile emissions are heavy.

Which of the following, if true, calls into question the explanation above?


(A) Many new houses are built with air-filtration systems that remove from the house pollutants that are generated indoors.

(B) The easing of standards for smokestack emissions has led to an increase in air-pollution levels in homes.

(C) New houses built in secluded rural areas are relatively free of air pollutants.

(D) Warm-weather conditions tend to slow down the movement of air, thus keeping pollution trapped near its source.

(E) Pressboard, an inexpensive new plywood substitute now often used in the construction of houses, emits the pollutant formaldehyde into the house.

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Re: Houses built during the last ten years have been found to contain indo  [#permalink]

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New post 27 Dec 2018, 13:30
IMO E
It gives the other reason for the increase of pollution in newer home
Thereby weakening the conclusion

Pressboard, an inexpensive new plywood substitute now often used in the construction of houses, emits the pollutant formaldehyde into the house.

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Re: Houses built during the last ten years have been found to contain indo  [#permalink]

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New post 27 Dec 2018, 14:07
Bunuel wrote:
Houses built during the last ten years have been found to contain indoor air pollution at levels that are, on average, much higher than the levels found in older houses. The reason air-pollution levels are higher in the newer houses is that many such houses are built near the sites of old waste dumps or where automobile emissions are heavy.

Which of the following, if true, calls into question the explanation above?


(A) Many new houses are built with air-filtration systems that remove from the house pollutants that are generated indoors.

(B) The easing of standards for smokestack emissions has led to an increase in air-pollution levels in homes.

(C) New houses built in secluded rural areas are relatively free of air pollutants.

(D) Warm-weather conditions tend to slow down the movement of air, thus keeping pollution trapped near its source.

(E) Pressboard, an inexpensive new plywood substitute now often used in the construction of houses, emits the pollutant formaldehyde into the house.


Conclusion:- Newer Houses contain more indoor air pollution than older houses.

Reason:- Newer houses are built near the site of dumps or where automobile emissions are heavy.

To find:- A statement, if true, refutes the reason for that conclusion. This could be an alternative reason that is responsible for the disparity observed between older and newer homes.

(A) Indoor Pollution is taken care of by the air filtration system, but what about the outdoor pollution? Nothing has been mentioned about the outdoor pollution. Out of Scope.

(B) Easing of standards would impact older and newer homes alike, leaving scope for the aforementioned reason to be plausible. Not refuting the reason. Eliminated.

(C) This actually strengthens the reason mentioned. For newer houses in secluded rural areas are free of air pollution implies that newer houses in busy industrial areas where air pollution is imminent is so because of external factors. Eliminated.

(D) This statement also somewhat strengthens the mentioned reason for if warm weather conditions keep air trapped at the source, then houses near the source would be affected. Eliminated.

(E) This statement presents an alternate reason filling in on the disparity between older and newer homes and thus, is the answer.

IMO, Option E.
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Re: Houses built during the last ten years have been found to contain indo  [#permalink]

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New post 27 Dec 2018, 20:47
Ypsychotic wrote:
Bunuel wrote:
Houses built during the last ten years have been found to contain indoor air pollution at levels that are, on average, much higher than the levels found in older houses. The reason air-pollution levels are higher in the newer houses is that many such houses are built near the sites of old waste dumps or where automobile emissions are heavy.

Which of the following, if true, calls into question the explanation above?


(A) Many new houses are built with air-filtration systems that remove from the house pollutants that are generated indoors. This strengthens the argument.

(B) The easing of standards for smokestack emissions has led to an increase in air-pollution levels in homes. This answer gives a reason why pollutants may have increased but doesn't compare a relationship between old and newer houses.

(C) New houses built in secluded rural areas are relatively free of air pollutants. Similar to A, this answer choice strengthens.

(D) Warm-weather conditions tend to slow down the movement of air, thus keeping pollution trapped near its source. We are comparing old houses and newer houses within the last 10 years. We are not concerned with warm weather conditions.

(E) Pressboard, an inexpensive new plywood substitute now often used in the construction of houses, emits the pollutant formaldehyde into the house.


Answer E is the best choice. This answer choice makes it clear that there is an alternative reason to poulltion besides auto emissions and waste dumps.
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Re: Houses built during the last ten years have been found to contain indo  [#permalink]

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New post 28 Dec 2018, 00:26
Option (E) explains the alternate cause of the indoor air pollution.
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Re: Houses built during the last ten years have been found to contain indo  [#permalink]

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New post 28 Dec 2018, 01:21
(A) Many new houses are built with air-filtration systems that remove from the house pollutants that are generated indoors.
Incorrect. These filters may be used in older houses too, we don't know.

(B) The easing of standards for smokestack emissions has led to an increase in air-pollution levels in homes.
Incorrect. The pollution should increase in older houses too, same as A we don't know

(C) New houses built in secluded rural areas are relatively free of air pollutants.
Incorrect. This is irrelevant to the argument. We only have to contrast older houses and newer houses.

(D) Warm-weather conditions tend to slow down the movement of air, thus keeping pollution trapped near its source.
Incorrect. This must also apply to the older houses, no contrast with newer houses.

(E) Pressboard, an inexpensive new plywood substitute now often used in the construction of houses, emits the pollutant formaldehyde into the house.
Correct. This is a new material used in houses and this new material emits pollutants. This is a third reason, hence calling into question the other 2 explanations.
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Houses built during the last ten years have been found to contain indo  [#permalink]

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New post 28 Dec 2018, 01:36
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An almost perfect explanation arihantjn93. Just wanted to point out that option (C) here is not irrelevant to the argument.

It actually strengthens the argument "which says that the reason new houses are polluted is that they are near waste dump areas and not because something is wrong with the new houses as compared to the old ones"

So option (C) - stating that new houses in secluded rural areas are relatively pollution free strengthens the argument's claim and is opposite of what we are looking for - that something is wrong with the new houses themselves.

This is why we discard option (C).

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arihantjn93 wrote:
(C) New houses built in secluded rural areas are relatively free of air pollutants.
Incorrect. This is irrelevant to the argument. We only have to contrast older houses and newer houses.

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Houses built during the last ten years have been found to contain indo   [#permalink] 28 Dec 2018, 01:36
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