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Air Quality Index
(AQI)
How to effectively solve the Air Pollution problem in Beijing
• Rodrigo Gomez
• Aaron Fuhrman
Executive Summary
 For this project we will gather data regarding the level of Air Quality
Index (AQI) in Beijing. We chose this populated city because of its high
AQI index.
 The Air Quality Index (AQI) has been developed by the Environmental
Protection Agency (EPA) to provide accurate, up-to-date, and easily
understandable information about daily levels of air pollution.
 Beijing is a city with over 21.500 million people. Because of this and the
lack of environmental action, Beijing is considered an “unhealthy” city
according to AQI
 We will analyze the data and make changes in order to improve the air
quality of the city by evaluating Control Charts and Capability Charts.
 The most important number on this scale is 100, since that number
corresponds to the standard established under the Clean Air Act. A 0.14
ppm
 Since Beijing has a AQI of 178 we assume the ppm to be 45500 reaching a
2 sigma level
Air Quality Index (AQI)
 The Air Quality Index (AQI) is a table that has been
developed by the Environmental Protection Agency (EPA)
to provide the regular citizen with accurate, up-to-date,
and easily understandable information about daily levels
of air pollution.
 The AQI takes into consideration four major pollutants:
Sulfur Dioxide (SO2), Carbon Monoxide (CO), Nitrogen
Dioxide (NO2) and Ozone.
 By recollecting data of the daily pollutant levels, the EPA
can assign a number regarding its AQI Range.
 The AQI is divided in 6 categories: 0 – 50 (Good), 51 – 100
(Moderate), 101 -150 (Unhealthy for sensitive groups),
151 – 200 (Unhealthy), 201 – 250 (Very Unhealthy) and
251 – 300 (Hazardous).
 The AQI Range of Beijing is 178 which falls in the
category of Unhealthy
Air Quality Index (AQI) Table.
New York vs Beijing AQI
X-Bar Chart
SUM 3782
Mean 157.5833
St. Dev 14.41618
UCL 166.0613
LCL 149.1053
CL 157.5833
A2 0.157
Range 54
7 points out of control exceeding the upper control limits
are present (11am,12pm,1pm,2am,3am,4am,5am). The
points below the LCL indicate that the air pollution
decreased and therefore we did not count them as OOC
points
115
125
135
145
155
165
175
185
6:00AM
7:00AM
8:00AM
9:00AM
10:00AM
11:00AM
12:00PM
1:00PM
2:00PM
3:00PM
4:00PM
5:00PM
6:00PM
7:00PM
8:00PM
9:00PM
10:00PM
11:00PM
12:00AM
1:00AM
2:00AM
3:00AM
4:00AM
5:00AM
AQI
X bar Chart Sept 29,2014
Series1 UCL LCL
Xmr Chart
Range 54
D4 1.548
D3 0.451
D2 3.895
UCL 163.8121
LCL 151.3546
CL 157.5833
8 points out of control exceeding the
upper control limits are present
(10am,11am,12pm,1pm,2am,3am,4am,5a
m). The points below the LCL indicate
that the air pollution decreased.
Therefore we did not count them as OOC
points
115
125
135
145
155
165
175
185
AQI
XmR Chart Sept 29,2014
Series1
UCL
LCL
Process Capability (Out of
Control)
• Sometimes the process
capability analysis indicates
an out-of-control process. It
is unsafe to estimate process
capability in such cases.
Therefore the reason because
this CP is so low is justified by
the fact that it is OOC (pg 377
“Montgomery”)
• A Cp of 1.0 indicates that the
process is in six sigma.
Therefore a Cp of 0.29 is not
a good process.
Causes:
 Due to the fact that Beijing is one of the most populated
cities in the world, the car industry has skyrocketed in
the last years (5 million vehicles and rising)
 The city does not have enough “green areas” in order to
soak up the fumes discharged by the vehicles and
industries
 The heavy reliance on coal power in industries has
contributed to the pollution problem
 A “green” culture for recycling and environmental laws
like the U.S one does not exist.
 Because of all these reasons it is easy to understand how
air pollution has spiraled out of control in Beijing.
Fish Bone Diagram
High
AQI
Levels
Over-
Population
No
“Green
Areas”
Coal
Industry
“Green”
Culture
*Over-population means
higher number of cars.
*This leads to high CO
and SO2 emissions.
*This is over 20% of the
global warming .
*Not enough
green
Areas to soak up
fumes and
contamination
residues.
*This industry affects issues
such as land use, waste
management, water and
air pollution
*High emissions of CO,
SO2 and NO2
*Complete
disregard
towards recycling and
environmental laws.
* “Green” Culture is
non-existent .
Solutions:
 Encourage Beijing citizens to buy electrical and environmental
friendly vehicles in order to significantly reduce the level of CO
emissions.
 Create new “Green Areas” by building new parks in the city. A study
released by the Environmental Science and Technology journal states
that around 30% of air pollution can be reduced by adding extra
trees and vegetation.
 Try to convince industries and corporations to reduce their reliance
on coal power, by seeking alternative ways to function and
manufacture such as Solar or Geothermal Power.
 Restructure and enforce new Environmental Laws in order to reduce
the amount of waste and garbage in Beijing.
 Explore new ways to significantly improve “Green Culture”. Such as
introducing new recycling campaigns into the school system,
educating average citizens by informing them of the current
pollution levels through TV and radio ads and by locating more
recycling bins around the city.
Improved Xmr Chart
90
95
100
105
110
115
6:00AM
8:00AM
10:00AM
12:00PM
2:00PM
4:00PM
6:00PM
8:00PM
10:00PM
12:00AM
2:00AM
4:00AM
AQI
Improve Chart
AQI
UCL
LCL
After implementing the solutions by
creating green areas, restructuring
environmental laws and reducing coal
power, the city of Beijing decreased
his AQI to 97 which falls in to the
moderate EPA descriptor
SUM 2535
AVERAGE 105.625
Std Dev 3.401133
D4 1.548
D3 0.451
D2 3.895
UCL 111.8537
LCL 99.39628
CL 107.0833
Process Capability Analysis Using a
Control Chart
 With the Process now in control we will calculate the Cp
by analyzing the Xmr Control chart from before.
 With the changes and solutions we obtained an
improved Cp of 0.95 which falls close to a six sigma level
Conclusion
 We started off with a AQI level of 178 (Unhealthy) for the
city of Beijing, this level was too high due to the fact
that it is one of the most populated cities in the world
without a “green culture”
 By analyzing the causes and control chart we
implemented a solution for this process for which we
were able lower the AQI to 98 which falls into the
moderate level.
 We Improved the Xmr chart by deleting the out-of-
control points and recalculating the control limits
 Once the process was stable we calculated the process
capability analysis to understand the sigma level and
observe the performance of the control chart
References:
 http://www.airnow.gov/index.cfm?action=airnow.local_s
tate
 http://aqicn.org/city/beijing/
 http://www.air.dnr.state.ga.us/information/aqi.html
 http://environment.nationalgeographic.com/environme
nt/global-warming/pollution-overview/

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Air Quality Index

  • 1. Air Quality Index (AQI) How to effectively solve the Air Pollution problem in Beijing • Rodrigo Gomez • Aaron Fuhrman
  • 2. Executive Summary  For this project we will gather data regarding the level of Air Quality Index (AQI) in Beijing. We chose this populated city because of its high AQI index.  The Air Quality Index (AQI) has been developed by the Environmental Protection Agency (EPA) to provide accurate, up-to-date, and easily understandable information about daily levels of air pollution.  Beijing is a city with over 21.500 million people. Because of this and the lack of environmental action, Beijing is considered an “unhealthy” city according to AQI  We will analyze the data and make changes in order to improve the air quality of the city by evaluating Control Charts and Capability Charts.  The most important number on this scale is 100, since that number corresponds to the standard established under the Clean Air Act. A 0.14 ppm  Since Beijing has a AQI of 178 we assume the ppm to be 45500 reaching a 2 sigma level
  • 3. Air Quality Index (AQI)  The Air Quality Index (AQI) is a table that has been developed by the Environmental Protection Agency (EPA) to provide the regular citizen with accurate, up-to-date, and easily understandable information about daily levels of air pollution.  The AQI takes into consideration four major pollutants: Sulfur Dioxide (SO2), Carbon Monoxide (CO), Nitrogen Dioxide (NO2) and Ozone.  By recollecting data of the daily pollutant levels, the EPA can assign a number regarding its AQI Range.  The AQI is divided in 6 categories: 0 – 50 (Good), 51 – 100 (Moderate), 101 -150 (Unhealthy for sensitive groups), 151 – 200 (Unhealthy), 201 – 250 (Very Unhealthy) and 251 – 300 (Hazardous).  The AQI Range of Beijing is 178 which falls in the category of Unhealthy
  • 4. Air Quality Index (AQI) Table.
  • 5. New York vs Beijing AQI
  • 6. X-Bar Chart SUM 3782 Mean 157.5833 St. Dev 14.41618 UCL 166.0613 LCL 149.1053 CL 157.5833 A2 0.157 Range 54 7 points out of control exceeding the upper control limits are present (11am,12pm,1pm,2am,3am,4am,5am). The points below the LCL indicate that the air pollution decreased and therefore we did not count them as OOC points 115 125 135 145 155 165 175 185 6:00AM 7:00AM 8:00AM 9:00AM 10:00AM 11:00AM 12:00PM 1:00PM 2:00PM 3:00PM 4:00PM 5:00PM 6:00PM 7:00PM 8:00PM 9:00PM 10:00PM 11:00PM 12:00AM 1:00AM 2:00AM 3:00AM 4:00AM 5:00AM AQI X bar Chart Sept 29,2014 Series1 UCL LCL
  • 7. Xmr Chart Range 54 D4 1.548 D3 0.451 D2 3.895 UCL 163.8121 LCL 151.3546 CL 157.5833 8 points out of control exceeding the upper control limits are present (10am,11am,12pm,1pm,2am,3am,4am,5a m). The points below the LCL indicate that the air pollution decreased. Therefore we did not count them as OOC points 115 125 135 145 155 165 175 185 AQI XmR Chart Sept 29,2014 Series1 UCL LCL
  • 8. Process Capability (Out of Control) • Sometimes the process capability analysis indicates an out-of-control process. It is unsafe to estimate process capability in such cases. Therefore the reason because this CP is so low is justified by the fact that it is OOC (pg 377 “Montgomery”) • A Cp of 1.0 indicates that the process is in six sigma. Therefore a Cp of 0.29 is not a good process.
  • 9. Causes:  Due to the fact that Beijing is one of the most populated cities in the world, the car industry has skyrocketed in the last years (5 million vehicles and rising)  The city does not have enough “green areas” in order to soak up the fumes discharged by the vehicles and industries  The heavy reliance on coal power in industries has contributed to the pollution problem  A “green” culture for recycling and environmental laws like the U.S one does not exist.  Because of all these reasons it is easy to understand how air pollution has spiraled out of control in Beijing.
  • 10. Fish Bone Diagram High AQI Levels Over- Population No “Green Areas” Coal Industry “Green” Culture *Over-population means higher number of cars. *This leads to high CO and SO2 emissions. *This is over 20% of the global warming . *Not enough green Areas to soak up fumes and contamination residues. *This industry affects issues such as land use, waste management, water and air pollution *High emissions of CO, SO2 and NO2 *Complete disregard towards recycling and environmental laws. * “Green” Culture is non-existent .
  • 11. Solutions:  Encourage Beijing citizens to buy electrical and environmental friendly vehicles in order to significantly reduce the level of CO emissions.  Create new “Green Areas” by building new parks in the city. A study released by the Environmental Science and Technology journal states that around 30% of air pollution can be reduced by adding extra trees and vegetation.  Try to convince industries and corporations to reduce their reliance on coal power, by seeking alternative ways to function and manufacture such as Solar or Geothermal Power.  Restructure and enforce new Environmental Laws in order to reduce the amount of waste and garbage in Beijing.  Explore new ways to significantly improve “Green Culture”. Such as introducing new recycling campaigns into the school system, educating average citizens by informing them of the current pollution levels through TV and radio ads and by locating more recycling bins around the city.
  • 12. Improved Xmr Chart 90 95 100 105 110 115 6:00AM 8:00AM 10:00AM 12:00PM 2:00PM 4:00PM 6:00PM 8:00PM 10:00PM 12:00AM 2:00AM 4:00AM AQI Improve Chart AQI UCL LCL After implementing the solutions by creating green areas, restructuring environmental laws and reducing coal power, the city of Beijing decreased his AQI to 97 which falls in to the moderate EPA descriptor SUM 2535 AVERAGE 105.625 Std Dev 3.401133 D4 1.548 D3 0.451 D2 3.895 UCL 111.8537 LCL 99.39628 CL 107.0833
  • 13. Process Capability Analysis Using a Control Chart  With the Process now in control we will calculate the Cp by analyzing the Xmr Control chart from before.  With the changes and solutions we obtained an improved Cp of 0.95 which falls close to a six sigma level
  • 14. Conclusion  We started off with a AQI level of 178 (Unhealthy) for the city of Beijing, this level was too high due to the fact that it is one of the most populated cities in the world without a “green culture”  By analyzing the causes and control chart we implemented a solution for this process for which we were able lower the AQI to 98 which falls into the moderate level.  We Improved the Xmr chart by deleting the out-of- control points and recalculating the control limits  Once the process was stable we calculated the process capability analysis to understand the sigma level and observe the performance of the control chart
  • 15. References:  http://www.airnow.gov/index.cfm?action=airnow.local_s tate  http://aqicn.org/city/beijing/  http://www.air.dnr.state.ga.us/information/aqi.html  http://environment.nationalgeographic.com/environme nt/global-warming/pollution-overview/