GMAT Question of the Day - Daily to your Mailbox; hard ones only

 It is currently 19 Jan 2019, 06:36

### GMAT Club Daily Prep

#### Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

## Events & Promotions

###### Events & Promotions in January
PrevNext
SuMoTuWeThFrSa
303112345
6789101112
13141516171819
20212223242526
272829303112
Open Detailed Calendar
• ### Free GMAT Strategy Webinar

January 19, 2019

January 19, 2019

07:00 AM PST

09:00 AM PST

Aiming to score 760+? Attend this FREE session to learn how to Define your GMAT Strategy, Create your Study Plan and Master the Core Skills to excel on the GMAT.
• ### FREE Quant Workshop by e-GMAT!

January 20, 2019

January 20, 2019

07:00 AM PST

07:00 AM PST

Get personalized insights on how to achieve your Target Quant Score.

# #Top150 CR: In 2009 the city of Los Bernardinos ranked worst

Author Message
TAGS:

### Hide Tags

Current Student
Joined: 19 Mar 2012
Posts: 4360
Location: India
GMAT 1: 760 Q50 V42
GPA: 3.8
WE: Marketing (Non-Profit and Government)
#Top150 CR: In 2009 the city of Los Bernardinos ranked worst  [#permalink]

### Show Tags

01 Jan 2016, 00:18
4
20
00:00

Difficulty:

95% (hard)

Question Stats:

38% (02:14) correct 62% (02:31) wrong based on 728 sessions

### HideShow timer Statistics

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.

_________________
Intern
Joined: 11 Jan 2014
Posts: 29
Location: Viet Nam
Concentration: Accounting, Finance
GPA: 3.17
WE: Analyst (Accounting)
#Top150 CR: In 2009 the city of Los Bernardinos ranked worst  [#permalink]

### Show Tags

Updated on: 01 Jan 2016, 11:21
A. The 2010 air pollution control measures enacted in Los Bernardinos were put into effect in 2012.
--> provide new information and help to explain the conclusion

B. In early 2012, the Pollution Control Board of Los Bernardinos revised the scale used to determine the amount of air pollution considered unhealthful.
-->This does not help to explain why level of pollution is reduced

C. In early 2012, a new and far more accurate gas spectrometer was invented.
-->Relevant but can be explained

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.
-->Relevant and can be explained

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.
--> Relevant and can be explained
_________________

Never forget what you are fighting for...
and when your mind and your body tell you to quit. Your heart will tell you to fight.

Originally posted by Kingsman on 01 Jan 2016, 01:46.
Last edited by Kingsman on 01 Jan 2016, 11:21, edited 4 times in total.
Manager
Joined: 22 Dec 2015
Posts: 89
Concentration: General Management
GMAT 1: 760 Q48 V47
GPA: 3.89
WE: Accounting (Energy and Utilities)
Re: #Top150 CR: In 2009 the city of Los Bernardinos ranked worst  [#permalink]

### Show Tags

01 Jan 2016, 11:06
1
Ugh, tough. I went with B. We need to find the answer that is NOT helpful in explaining the drop of air pollution levels.

A. The 2010 air pollution control measures enacted in Los Bernardinos were put into effect in 2012. This would explain why levels dropped in 2012. Helpful.

B. In early 2012, the Pollution Control Board of Los Bernardinos revised the scale used to determine the amount of air pollution considered unhealthful. While the health effects of pollution are discussed, we are asked to examine what doesn't explain the drop in pollution levels. It the Pollution Control Board changed the scale and now 50 smog days are unhealthy as opposed to the previous 75 (hypothetically), that doesn't explain the drop in pollution levels.

C. In early 2012, a new and far more accurate gas spectrometer was invented. Would explain the drop in 2012. Helpful

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. I could possibly see this as an explanation. Just because they had been exempt from 2009-2011 doesn't mean they weren't exempt in 2012. Possibly helpful

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. If it took two years for the 2009 controls to take effect, that explains why the drop didn't happen until 2012. Helpful.
Retired Moderator
Joined: 18 Sep 2014
Posts: 1113
Location: India
#Top150 CR: In 2009 the city of Los Bernardinos ranked worst  [#permalink]

### Show Tags

01 Jan 2016, 13:42
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..........explains the paradox

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

C. In early 2012, a new and far more accurate gas spectrometer was invented...........explains the paradox

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.............does not explain why the smog alerts dropped if the pollution increased

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...........explains the paradox

Here is my analysis. Please explain why C is right and D is wrong.
Board of Directors
Joined: 17 Jul 2014
Posts: 2599
Location: United States (IL)
Concentration: Finance, Economics
GMAT 1: 650 Q49 V30
GPA: 3.92
WE: General Management (Transportation)
Re: #Top150 CR: In 2009 the city of Los Bernardinos ranked worst  [#permalink]

### Show Tags

01 Jan 2016, 19:44
souvik101990 wrote:
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.

tough one, was struck between C and E.

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.
now this explains why in 2010 and 2011 the # of days did not drop.

B. In early 2012, the Pollution Control Board of Los Bernardinos revised the scale used to determine the amount of air pollution considered unhealthful.
this one helps explain. before, the level considered unhealthful was way higher than now. thus, the number of days have decreased.

C. In early 2012, a new and far more accurate gas spectrometer was invented.
so what? does it explain why the number of days has dropped?

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.
now this is interesting, in 2011 people found out that some industries were not actually reducing the pollution. after everything came out to public, the pollution decreased, and thus we can explain why in 2012 the number of days decreased.

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 one help explain as well, although might not, from the first look. we are told that in 2010, the city adopted some measures. if the measures were successful, but the ozone and carbon monoxide takes time to decompose, then of course, in 2010 and 2011 the number of days with high level of smog were high, and in 2012 dropped considerably.
Manager
Joined: 15 May 2010
Posts: 159
Location: India
Concentration: Strategy, General Management
WE: Engineering (Manufacturing)
Re: #Top150 CR: In 2009 the city of Los Bernardinos ranked worst  [#permalink]

### Show Tags

01 Jan 2016, 21:16
Nevernevergiveup wrote:
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..........explains the paradox

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

C. In early 2012, a new and far more accurate gas spectrometer was invented...........explains the paradox

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.............does not explain why the smog alerts dropped if the pollution increased

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...........explains the paradox

Here is my analysis. Please explain why C is right and D is wrong.

C actually doesn't help us to analyse the air pollution levels between 2009-2012.

Just compare the words of the two options:

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

Suppose the scale was 0-100 mg/Nm3 dust level. This scale was changes to, say, 0-250 mg/Nm3. what would happen next? This leads to increased amount of pollution level currently exisiting.

It is now connected to final sentence of the argument-----

"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."

Thanks,

Sun01
Intern
Joined: 30 Nov 2015
Posts: 9
Re: #Top150 CR: In 2009 the city of Los Bernardinos ranked worst  [#permalink]

### Show Tags

02 Jan 2016, 12:25
1
sun01 wrote:
Nevernevergiveup wrote:
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..........explains the paradox

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

C. In early 2012, a new and far more accurate gas spectrometer was invented...........explains the paradox

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.............does not explain why the smog alerts dropped if the pollution increased

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...........explains the paradox

Here is my analysis. Please explain why C is right and D is wrong.

C actually doesn't help us to analyse the air pollution levels between 2009-2012.

Just compare the words of the two options:

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

Suppose the scale was 0-100 mg/Nm3 dust level. This scale was changes to, say, 0-250 mg/Nm3. what would happen next? This leads to increased amount of pollution level currently exisiting.

It is now connected to final sentence of the argument-----

"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."

Thanks,

Sun01

I would have to agree here. Between B and C, C would not affect the drop in pollution level because even if a new spectrometer was INVENTED, the answer choice does not suggest anything about it being implemented in early 2012 (which would give this choice a little more credibility in explaining the paradox). Furthermore, I would say that B can explain the paradox because if the scale was changed, the smog alert may not be triggered, and therefore cause a reduction in the "pollution days".

Either way, I think B is poorly worded and slightly ambiguous in meaning.
Manager
Joined: 14 Jul 2014
Posts: 170
Location: United States
Schools: Duke '20 (D)
GMAT 1: 600 Q48 V27
GMAT 2: 720 Q50 V37
GPA: 3.2
#Top150 CR: In 2009 the city of Los Bernardinos ranked worst  [#permalink]

### Show Tags

29 Feb 2016, 09:17
confused about C - if it was more accurate, it could be reading more correctly now - this could mean that earlier it was raising false alerts.. so how can C least explain the paradox? It certainly can go both ways.

If the meter was inaccurate before, it could be reading incorrectly and raising unnecessary false alerts?
Manager
Status: GMAT Coach
Joined: 05 Nov 2012
Posts: 143
Location: Peru
GPA: 3.98
#Top150 CR: In 2009 the city of Los Bernardinos ranked worst  [#permalink]

### Show Tags

19 Oct 2016, 06:08
dina98 wrote:
confused about C - if it was more accurate, it could be reading more correctly now - this could mean that earlier it was raising false alerts.. so how can C least explain the paradox? It certainly can go both ways.

If the meter was inaccurate before, it could be reading incorrectly and raising unnecessary false alerts?

All the answers can explain the drop in 2012. However, the question is “which would be the LEAST helpful"

A. Explains

B. The scale could be very different in 2012. Explains

C. The premise does not say that the older gas spectrometer was very inaccurate, just that the new one is more accurate. The drop is too steep to be blamed for the accuracy of the spectrometer. Even if the new gas spectrometer could explain some drop, it is the least helpful.

D. When the mayor of Los Bernardinos was found to have accepted donations (He was stopped, so in 2012 those industries were not exempted.) Explains

E. Explains

_________________

Clipper Ledgard
GMAT Coach

Retired Moderator
Joined: 14 Dec 2013
Posts: 2911
Location: Germany
Schools: German MBA
GMAT 1: 780 Q50 V47
WE: Corporate Finance (Pharmaceuticals and Biotech)
#Top150 CR: In 2009 the city of Los Bernardinos ranked worst  [#permalink]

### Show Tags

17 Dec 2016, 23:37
2
Option C:
If an accurate* detector was invented in 2012, then the number of alarms should have INCREASED (not decreased) in 2012. However the passage states that the number of smog alerts in Los Bernardinos dropped to 118. Thus invention of detector DOES NOT EXPLAIN the trend seen during the period. Hence Option C is the correct answer.

(*N.B.: Technically, the wording should have been "more sensitive", not "more accurate". Sensitivity of an instrument causes more number of true alarms that are not possible to detect by a less sensitive instrument. Accuracy of an instrument has nothing to do with more number of alarms.)
Intern
Joined: 28 Mar 2018
Posts: 46
Re: #Top150 CR: In 2009 the city of Los Bernardinos ranked worst  [#permalink]

### Show Tags

11 Apr 2018, 13:57
I don't agree with this answer at all. A more accurate measuring instrument could absolutely affect the number of smog days recorded. Lets say our threshold is for smog is 10 units (whatever that means). I could have true measurements of 9.9999, 10.0005, 9.9999 10.0004. If my measuring instrument can only give me to the 100ths spot I would likely have four measurements of 10 instead of 2 measures above and 2 measurements below.

Also the example I gave was very small incremental number differences, but the answer states that it was "far more accurate." I personally picked D, although I wasn't happy with that answer either.
Intern
Joined: 03 Jan 2016
Posts: 22
Re: #Top150 CR: In 2009 the city of Los Bernardinos ranked worst  [#permalink]

### Show Tags

11 Apr 2018, 19:23
IMO "C".

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?

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

Invention of a more accurate spectrometer in 2012 has nothing to explain the air pollution levels between 2009-2012.
Director
Joined: 02 Oct 2017
Posts: 735
Re: #Top150 CR: In 2009 the city of Los Bernardinos ranked worst  [#permalink]

### Show Tags

23 Apr 2018, 08:48
Options A,D and E clearly explain the cause.

B and C are A bit tricky

B kind of explain low level of pollution
But C talks about spectrograph it neither supports or undermine the reasoning so

Posted from my mobile device
_________________

Give kudos if you like the post

Director
Joined: 26 Aug 2016
Posts: 612
Location: India
GMAT 1: 690 Q50 V33
GMAT 2: 700 Q50 V33
GMAT 3: 730 Q51 V38
GPA: 4
WE: Information Technology (Consulting)
Re: #Top150 CR: In 2009 the city of Los Bernardinos ranked worst  [#permalink]

### Show Tags

31 May 2018, 20:31
Hi i chose D at start but later after re reading i found it was SILLY of me to opt D. rofl.

C says : a MORE Accurate gas spectrometer was invented. So basically he is saying the previous one was near to accurate now they invented MORE accurate. If it were having that much difference he will say: An Accurate gas spectrometer was invented.
So doesn't help.

D says: 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.
This clearly says that Mayor was found to have accepted bribes. That's why there was an increase in 2011. This explains that why there was an increase in 2011.

This need not explain why there was a decrease in 2012. It does support one of the statements made by author.

An awesome question.

Thank you for posting it.
Manager
Joined: 29 Mar 2015
Posts: 62
Location: India
GMAT 1: 640 Q49 V28
GPA: 3.1
Re: #Top150 CR: In 2009 the city of Los Bernardinos ranked worst  [#permalink]

### Show Tags

25 Jun 2018, 08:00
souvik101990 wrote:
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.

Hi Guys
can we mark option C on the basis that it say "gas spectrometer was invented" it might have been invented in some far away city from Los Bernardinos and never have been used in the city.
Manager
Joined: 18 Apr 2018
Posts: 97
Re: #Top150 CR: In 2009 the city of Los Bernardinos ranked worst  [#permalink]

### Show Tags

26 Jun 2018, 03:08
2
I quite disagree with the answer as well. The question ends stating a fact that the pollutants were measured by gas spectroscopy even though it adds little to the logical structure, I feel it gives Option C relevance in explaining the discrepancy. For Option D to explain the discrepancy however, we have to imply a lot of scenarios not supported and cannot be strongly inferred from the passage. Option D the is still the answer to me.

Posted from my mobile device
Manager
Joined: 18 Apr 2018
Posts: 97
#Top150 CR: In 2009 the city of Los Bernardinos ranked worst  [#permalink]

### Show Tags

26 Jun 2018, 03:09
souvik101990 wrote:
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.

Pls provide a wholesome explanation to How you arrived at OA. Thanks.

Posted from my mobile device
Manager
Joined: 30 Dec 2015
Posts: 83
GPA: 3.92
WE: Engineering (Aerospace and Defense)
#Top150 CR: In 2009 the city of Los Bernardinos ranked worst  [#permalink]

### Show Tags

28 Jun 2018, 16:24
2
Kem12 wrote:
I quite disagree with the answer as well. The question ends stating a fact that the pollutants were measured by gas spectroscopy even though it adds little to the logical structure, I feel it gives Option C relevance in explaining the discrepancy. For Option D to explain the discrepancy however, we have to imply a lot of scenarios not supported and cannot be strongly inferred from the passage. Option D the is still the answer to me.

Posted from my mobile device

Well, just because a far more accurate gas spectrometer was invented in 2012, does not mean the city of Los Bernardinos implemented this very same spectrometer to measure air contaminants.
Here, Ford invented a new technology in 2018, preventing car accidents; does this mean this technology is already present in 2018 vehicles? No, Ford could take time to successfully implement this technology in their vehicles.
For this very reason, 'C' has no relation to the air pollution levels in Los Bernardinos.
_________________

If you analyze enough data, you can predict the future.....its calculating probability, nothing more!

Intern
Joined: 02 Nov 2017
Posts: 32
Location: India
Concentration: General Management, Finance
GMAT 1: 660 Q49 V29
GPA: 3.31
WE: General Management (Energy and Utilities)
#Top150 CR: In 2009 the city of Los Bernardinos ranked worst  [#permalink]

### Show Tags

11 Jul 2018, 23:11
souvik101990 wrote:
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.

It says least explain...(C) so a more accurate spectrometer least explains.because the last spectrometer was only less accurate. So a significant change in pollutant levels is not expected. Besides it does not say that spectrometer is in use (B) says scales were changed...that explains a lot. When 50 level smog was considered dangerous last year,,,this year level 35 is considered dangerous.So a more number of days are considered for smog alert.
#Top150 CR: In 2009 the city of Los Bernardinos ranked worst &nbs [#permalink] 11 Jul 2018, 23:11
Display posts from previous: Sort by