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UNITED STATES ENVIRONMENTAL PROTECTION AGENCY


WASHINGTON, D.C. 20460

OFFICE OF
 Mr. John Judge AIR AND RADIATION 

CEO 

Appalachian Mountain Club 

5 Joy Street 

Boston, Massachusetts 02108. 

Thank you for your letter of November 5, 2013, urging the U.S. Environmental Protection Agency to 

finalize as soon as possible the rulemaking for "Tier 3" light-duty vehicle emissions and gasoline 

standards. The EPA is developing the Tier 3 standards to respond to the critical need to improve air 

quality and to enable a harmonized national vehicle emissions control program. The EPA shares your 

goal of reducing air pollution across the United States, and the Tier 3 standards have the potential to 

achieve significant benefits. 

This Tier 3 rule would reduce motor vehicle emissions and help state and local areas attain and maintain 

the existing health-based air quality standards in a cost-effective and timely way. The reductions in 

ozone and particulate matter would avoid premature mortality and other health impacts, including 

respiratory symptoms in children and exacerbation of asthma. A timely Tier 3 program is critical to 

addressing the impacts of motor vehicles on air quality and public health; therefore, we are working to 

finalize the Tier 3 rule as expeditiously as possible and currently intend to issue the final rule in 

February 2014. 

Again, thank you for your letter and for your continued support of the Tier 3 program. I appreciate your 

commitment to achieving clean air for all Americans, and I look forward to continuing to work together 

towards that goal. 

cc: Ms. Jesse Prentice-Dunn 

Sierra Club 

50 F Street, N.W, Eight Floor 

Washington, D.C. 20001

Internet Address (UPL) • http /Iwww epa gay


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stoeI-runarer, Director 

Office ofl'ransportation and Air Quality 

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UNITED STATES ENVIRONMENTAL PROTECTION AGENCY


WASHINGTON, D.C. 20460

OFF!CE OF
 Mr. David Foster AR AND RADIAT!ON 

Executive Director 

Blue Green Alliance 

2828 University Avenue, SE 

Suite 200 

Minneapolis, Minnesota 55414 

Thank you for your letter of November 5, 2013, urging the U.S. Environmental Protection Agency to 

finalize as soon as possible the rulemaking for "Tier 3" light-duty vehicle emissions and gasoline 

standards. The EPA is developing the Tier 3 standards to respond to the critical need to improve air 

quality and to enable a harmonized national vehicle emissions control program. The EPA shares your 

goal of reducing air pollution across the United States, and the Tier 3 standards have the potential to 

achieve significant benefits. 

This Tier 3 rule would reduce motor vehicle emissions and help state and local areas attain and maintain 

the existing health-based air quality standards in a cost-effective and timely way. The reductions in 

ozone and particulate matter would avoid premature mortality and other health impacts, including 

respiratory symptoms in children and exacerbation of asthma. A timely Tier 3 program is critical to 

addressing the impacts of motor vehicles on air quality and public health; therefore, we are working to 

finalize the Tier 3 rule as expeditiously as possible and currently intend to issue the final rule in 

February 2014.

cc: Ms. Jesse Prentice-Dunn 

Sierra Club 

50 F Street, N.W, Eight Floor 

Washington, D.C. 20001

Internet Address (URL) . http//wwwepa.gov


Recycled/Recyclable . Printed with Vegetable Oil Based Inks on 100% Postconsumer. Process Chlonne Free Recycled Paper
Transportation and Air Quality 

S7. 

PRO

UNITED STATES ENVIRONMENTAL PROTECTION AGENCY


WASH!NGTON, D.C. 20460

OFFICE f
 Mr. Kieran Suckling AIR AND RADIATION 

Executive Director 

Center for Biological Diversity 

P.O. Box 710 

Tucson, Arizona 85702-0710 

Dear Mr. Suckling: 

Thank you for your letter of November 5, 2013, urging the U.S. Environmental Protection Agency to 

finalize as soon as possible the rulemaking for "Tier 3" light-duty vehicle emissions and gasoline 

standards. The EPA is developing the Tier 3 standards to respond to the critical need to improve air 

quality and to enable a harmonized national vehicle emissions control program. The EPA shares your 

goal of reducing air pollution across the United States, and the Tier 3 standards have the potential to 

achieve significant benefits. 

This Tier 3 rule would reduce motor vehicle emissions and help state and local areas attain and maintain 

the existing health-based air quality standards in a cost-effective and timely way. The reductions in 

ozone and particulate matter would avoid premature mortality and other health impacts, including 

respiratory symptoms in children and exacerbation of asthma. A timely Tier 3 program is critical to 

addressing the impacts of motor vehicles on air quality and public health; therefore, we are working to 

finalize the Tier 3 rule as expeditiously as possible and currently intend to issue the final rule in 

February 2014. 

Again, thank you for your letter and for your continued support of the Tier 3 program. I appreciate your 

commitment to achieving clean air for all Americans, and I look forward to continuing to work together 

towards that goal.

cc: Ms. Jesse Prentice-Dunn 

Sierra Club 

50 F Street, N.W, Eight Floor 

Washington, D.C. 20001

Internet Address (URL) . http /Jwww epa gov 


Recycled/Recyclable . Printed wjth Vegetable 0/ Based inks on 100% Postconsumer. Process Chlor!ne Free Recycled Paper
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UNITED STATES ENVIRONMENTAL PROTECTION AGENCY


WASHINGTON, D.C. 20460 

r;	r;' 

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OFFICE OF


Mr. Frank O'Donnell AIR AND RADIATION 

President 

Clean Air Watch 

1090 Vermont Avenue, N.W. 

Washingn, D.cL 20005 

Thank you fbr your letter of November 5, 2013, urging the U.S. Environmental Protection Agency to 

finalize as soon as possible the rulemaking for "Tier 3" light-duty vehicle emissions and gasoline 

standards. The EPA is developing the Tier 3 standards to respond to the critical need to improve air 

quality and to enable a harmonized national vehicle emissions control program. The EPA shares your 

goal of reducing air pollution across the United States, and the Tier 3 standards have the potential to 

achieve significant benefits. 

This Tier 3 rule would reduce motor vehicle emissions and help state and local areas attain and maintain 

the existing health-based air quality standards in a cost-effective and timely way. The reductions in 

ozone and particulate matter would avoid premature mortality and other health impacts, including 

respiratory symptoms in children and exacerbation of asthma. A timely Tier 3 program is critical to 

addressing the impacts of motor vehicles on air quality and public health; therefore, we are working to 

finalize the Tier 3 rule as expeditiously as possible and currently intend to issue the final rule in 

February 2014. 

Again, thank you for your letter and for your continued support of the Tier 3 program. I appreciate your 

commitment to achieving clean air for all Americans, and I look forward to continuing to work together 

towards that goal. 

cc: Ms. Jesse Prentice-Dunn 

Sierra Club 

50 F Street, N.W, Eight Floor 

Washington, D.C. 20001

Internet Address (URIC http//wwwepa gov


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UNITED STATES ENVIRONMENTAL PROTECTION AGENCY


WASHINGTON, DC. 20460

OFFICE OF
 Mr. Robert Wendelgass AIR AND RADIATION 

President 

Clean Water Action 

1010 Vermont Avenue, N.W., #400 

Washington, D.C. 20005 

Dear Mr. Wendelgass: 

Thank you for your letter of November 5, 2013, urging the U.S. Environmental Protection Agency to 

finalize as soon as possible the rulemaking for "Tier 3" light-duty vehicle emissions and gasoline 

standards. The EPA is developing the Tier 3 standards to respond to the critical need to improve air 

quality and to enable a harmonized national vehicle emissions control program. The EPA shares your 

goal of reducing air pollution across the United States, and the Tier 3 standards have the potential to 

achieve significant benefits. 

This Tier 3 rule would reduce motor vehicle emissions and help state and local areas attain and maintain 

the existing health-based air quality standards in a cost-effective and timely way. The reductions in 

ozone and particulate matter would avoid premature mortality and other health impacts, including 

respiratory symptoms in children and exacerbation of asthma. A timely Tier 3 program is critical to 

addressing the impacts of motor vehicles on air quality and public health; therefore, we are working to 

finalize the Tier 3 rule as expeditiously as possible and currently intend to issue the final rule in 

February 2014. 

Again, thank you for your letter and for your continued support of the Tier 3 program. I appreciate your 

commitment to achieving clean air for all Americans, and I look forward to continuing to work together 

towards that goal. 

cc: Ms. Jesse Prentice-Dunn 

Sierra Club 

50 F Street, N.W, Eight Floor 

Washington, D.C. 20001

Internet Address (URL) httpl/wwwepagov


Recycled/Recyclable . Printed with Vegetable Oil Based Inks on 100% Postconsumer. Process Chlor!ne Free Recycled Paper
S7.

UNITED STATES ENVIRONMENTAL PROTECTION AGENCY


WASHINGTON, D.C. 20460

OFFICE OF
 Ms. Kathleen Rogers AIR AND RADIATION 

President 

Earth Day Network 

1616 P Street, N.W., Suite 340 

Washington, D.C. 20036 

Thank you for your letter of November 5, 2013, urging the U.S. Environmental Protection Agency to 

finalize as soon as possible the rulemaking for "Tier 3" light-duty vehicle emissions and gasoline 

standards. The EPA is developing the Tier 3 standards to respond to the critical need to improve air 

quality and to enable a harmonized national vehicle emissions control program. The EPA shares your 

goal of reducing air pollution across the United States, and the Tier 3 standards have the potential to 

achieve significant benefits. 

This Tier 3 rule would reduce motor vehicle emissions and help state and local areas attain and maintain 

the existing health-based air quality standards in a cost-effective and timely way. The reductions in 

ozone and particulate matter would avoid premature mortality and other health impacts, including 

respiratory symptoms in children and exacerbation of asthma. A timely Tier 3 program is critical to 

addressing the impacts of motor vehicles on air quality and public health; therefore, we are working to 

finalize the Tier 3 rule as expeditiously as possible and currently intend to issue the final rule in 

February 2014. 

Again, thank you for your letter and for your continued support of the Tier 3 program. I appreciate your 

commitment to achieving clean air for all Americans, and I look forward to continuing to work together 

towards that goal.

stopfrf Grundler, Director 

Office or Transportation and Air Quality 

cc: Ms. Jesse Prentice-Dunn 

Sierra Club 

50 F Street, N.W, Eight Floor 

Washington, D.C. 20001

Internet Address (URL) . http //www.epagov


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hristoil1er'Grundler, Director

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UNITED STATES ENVIRONMENTAL PROTECTION AGENCY


WASHINGTON, D.C. 20460

OFFICE OF
 Ms. Margie Alt AIR AND RADIATION 

Executive Director 

Environment America 

44 Winter Street, 4th Floor 

Boston, Massachusetts 02108 

Thank you for your letter of November 5, 2013, urging the U.S. Environmental Protection Agency to 

finalize as soon as possible the rulemaking for "Tier 3" light-duty vehicle emissions and gasoline 

standards. The EPA is developing the Tier 3 standards to respond to the critical need to improve air 

quality and to enable a harmonized national vehicle emissions control program. The EPA shares your 

goal of reducing air pollution across the United States, and the Tier 3 standards have the potential to 

achieve significant benefits. 

This Tier 3 rule would reduce motor vehicle emissions and help state and local areas attain and maintain 

the existing health-based air quality standards in a cost-effective and timely way. The reductions in 

ozone and particulate matter would avoid premature mortality and other health impacts, including 

respiratory symptoms in children and exacerbation of asthma. A timely Tier 3 program is critical to 

addressing the impacts of motor vehicles on air quality and public health; therefore, we are working to 

finalize the Tier 3 rule as expeditiously as possible and currently intend to issue the final rule in 

February 2014. 

Again, thank you for your letter and for your continued support of the Tier 3 program. I appreciate your 

commitment to achieving clean air for all Americans, and I look forward to continuing to work together 

towards that goal.

Office 4f Transportation and Air Quality 

cc: Ms. Jesse Prentice-Dunn 

Sierra Club 

50 F Street, N.W, Eight Floor 

Washington, D.C. 20001

Internet Address (URL) . http//wwwepagov


Recycled/Recyclable Printed with Vegetable Oil Based Inks on 100% Postoonsumer. Process Chlonne Free Recycled Paper 
^n^^TEDSTA7

UNITED STATES ENVIRONMENTAL PROTECTION AGENCY


WASHINGTON, D.C. 20460

OFFICE OF


Mr. Fred Krupp AIR ND RADIATION 

President 

Environmental Defense Fund 

1875 Connecticut Avenue, N.W. 

Washington, D.C. 20009 

Thank you for your letter of November 5, 2013, urging the U.S. Environmental Protection Agency to 

finalize as soon as possible the rulemaking for "Tier 3" light-duty vehicle emissions and gasoline 

standards. The EPA is developing the Tier 3 standards to respond to the critical need to improve air 

quality and to enable a harmonized national vehicle emissions control program. The EPA shares your 

goal of reducing air pollution across the United States, and the Tier 3 standards have the potential to 

achieve significant benefits. 

This Tier 3 rule would reduce motor vehicle emissions and help state and local areas attain and maintain 

the existing health-based air quality standards in a cost-effective and timely way. The reductions in 

ozone and particulate matter would avoid premature mortality and other health impacts, including 

respiratory symptoms in children and exacerbation of asthma. A timely Tier 3 program is critical to 

addressing the impacts of motor vehicles on air quality and public health; therefore, we are working to 

finalize the Tier 3 rule as expeditiously as possible and currently intend to issue the final rule in 

February 2014. 

Again, thank you for your letter and for your continued support of the Tier 3 program. I appreciate your 

commitment to achieving clean air for all Americans, and I look forward to continuing to work together 

towards that goal.

ristopièrGruiidler, Director 

Office of Transportation and Air Quality 

cc: Ms. Jesse Prentice-Dunn 

Sierra Club 

50 F Street, N.W, Eight Floor 

Washington, D.C. 20001

Internet Address URL) http//www.epagov 


Recycled/Recyclable Printed with Vegetable Oil Based Inks on 1000/o Postconsurner Process Chlorine Free Recycled Paper
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UNITED STATES ENVIRONMENTAL PROTECTION AGENCY


WASHINGTON, D.C. 20460 

PRO

OFFICE OF


Mr. Howard Learner AIR AND RADIATION 

President & Executive Director 

Environmental Law & Policy Center 

500 New Jersey Avenue, N.W. 

Suite 375 

Washington, D.C. 20001 

Thank you for your letter of November 5, 2013, urging the U.S. Environmental Protection Agency to 

finalize as soon as possible the rulemaking for "Tier 3" light-duty vehicle emissions and gasoline 

standards. The EPA is developing the Tier 3 standards to respond to the critical need to improve air 

quality and to enable a harmonized national vehicle emissions control program. The EPA shares your 

goal of reducing air pollution across the United States, and the Tier 3 standards have the potential to 

achieve significant benefits. 

This Tier 3 rule would reduce motor vehicle emissions and help state and local areas attain and maintain 

the existing health-based air quality standards in a cost-effective and timely way. The reductions in 

ozone and particulate matter would avoid premature mortality and other health impacts, including 

respiratory symptoms in children and exacerbation of asthma. A timely Tier 3 program is critical to 

addressing the impacts of motor vehicles on air quality and public health; therefore, we are working to 

finalize the Tier 3 rule as expeditiously as possible and currently intend to issue the final rule in 

February 2014. 

Again, thank you for your letter and for your continued support of the Tier 3 program. I appreciate your 

commitment to achieving clean air for all Americans, and I look forward to continuing to work together 

towards that goal.

hritopier undléf1Yirector 

Office of' Transportation and Air Quality 

cc: Ms. Jesse Prentice-Dunn 

Sierra Club 

50 F Street, N.W, Eight Floor 

Washington, D.C. 20001

Internet Address (URL) http I/www epa.gcv


Recycled/Recyclable Printed with Vegetable Oil Based Inks on 1000/o Postconsumer. Process Chlorine Free Recycled Paper
stoprrundler, Director 

Office of Transportation and Air Quality

UNITED STATES ENVIRONMENTAL PROTECTION AGENCY 


WASHINGTON, D.C. 20460

1°

OFFFCE OF
 Mr. Gene Karpinski AR AND RADIAT!ON 

President 

League of Conservation Voters 

1920 L Street, N.W., Suite 800 

Washington, D.C. 20036 

Dear Mr. Karpinski: 

Thank you for your letter of November 5, 2013, urging the U.S. Environmental Protection Agency to 

finalize as soon as possible the rulemaking for "Tier 3" light-duty vehicle emissions and gasoline 

standards. The EPA is developing the Tier 3 standards to respond to the critical need to improve air 

quality and to enable a harmonized national vehicle emissions control program. The EPA shares your 

goal of reducing air pollution across the United States, and the Tier 3 standards have the potential to 

achieve significant benefits. 

This Tier 3 rule would reduce motor vehicle emissions and help state and local areas attain and maintain 

the existing health-based air quality standards in a cost-effective and timely way. The reductions in 

ozone and particulate matter would avoid premature mortality and other health impacts, including 

respiratory symptoms in children and exacerbation of asthma. A timely Tier 3 program is critical to 

addressing the impacts of motor vehicles on air quality and public health; therefore, we are working to 

finalize the Tier 3 rule as expeditiously as possible and currently intend to issue the final rule in 

February 2014. 

Again, thank you for your letter and for your continued support of the Tier 3 program. I appreciate your 

commitment to achieving clean air for all Americans, and I look forward to continuing to work together 

towards that goal. 

cc: Ms. Jesse Prentice-Dunn 

Sierra Club 

50 F Street, N.W, Eight Floor 

Washington, D.C. 20001

Internet Address URL) http./Jwww.epa.gcv


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UNITED STATES ENVIRONMENTAL PROTECTION AGENCY


WASHINGTON, D.C. 20460

OFFCE OF
 Ms. Dominique Browning AjR AND RADrATON 

Senior Director 

Moms Clean Air Force 

do Environmental Defense Fund 

257 Park Avenue South 

New York, New York 10010 

Dear Ms. Browning: 

Thank you for your letter of November 5, 2013, urging the U.S. Environmental Protection Agency to 

finalize as soon as possible the rulemaking for "Tier 3" light-duty vehicle emissions and gasoline 

standards. The EPA is developing the Tier 3 standards to respond to the critical need to improve air 

quality and to enable a harmonized national vehicle emissions control program. The EPA shares your 

goal of reducing air pollution across the United States, and the Tier 3 standards have the potential to 

achieve significant benefits. 

This Tier 3 rule would reduce motor vehicle emissions and help state and local areas attain and maintain 

the existing health-based air quality standards in a cost-effective and timely way. The reductions in 

ozone and particulate matter would avoid premature mortality and other health impacts, including 

respiratory symptoms in children and exacerbation of asthma. A timely Tier 3 program is critical to 

addressing the impacts of motor vehicles on air quality and public health; therefore, we are working to 

finalize the Tier 3 rule as expeditiously as possible and currently intend to issue the final rule in 

February 2014. 

Again, thank you for your letter and for your continued support of the Tier 3 program. I appreciate your 

commitment to achieving clean air for all Americans, and I look forward to continuing to work together 

towards that goal.

Office o Transportation and Air Quality 

cc: Ms. Jesse Prentice-Dunn 

Sierra Club 

50 F Street, N.W, Eight Floor 

Washington, D.C. 20001

nternet Address (URL) • http.//www.epa gov


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UNITED STATES ENVIRONMENTAL PROTECTION AGENCY


WASHINGTON, DC. 20460

OFFICE OF
 Ms. Theresa Pierno AIR AND RADIATION 

Acting President 

National Parks & Conservation Association 

777 6th Street, N.W., Suite 700 

Washington, D.C. 20001-3723 

Thank you for your letter of November 5, 2013, urging the U.S. Environmental Protection Agency to 

fmalize as soon as possible the rulemaking for "Tier 3" light-duty vehicle emissions and gasoline 

standards. The EPA is developing the Tier 3 standards to respond to the critical need to improve air 

quality and to enable a harmonized national vehicle emissions control program. The EPA shares your 

goal of reducing air pollution across the United States, and the Tier 3 standards have the potential to 

achieve significant benefits. 

This Tier 3 rule would reduce motor vehicle emissions and help state and local areas attain and maintain 

the existing health-based air quality standards in a cost-effective and timely way. The reductions in 

ozone and particulate matter would avoid premature mortality and other health impacts, including 

respiratory symptoms in children and exacerbation of asthma. A timely Tier 3 program is critical to 

addressing the impacts of motor vehicles on air quality and public health; therefore, we are working to 

finalize the Tier 3 rule as expeditiously as possible and currently intend to issue the final rule in 

February 2014. 

Again, thank you for your letter and for your continued support of the Tier 3 program. I appreciate your 

commitment to achieving clean air for all Americans, and I look forward to continuing to work together 

towards that goal. 

cc: Ms. Jesse Prentice-Dunn 

Sierra Club 

50 F Street, N.W, Eight Floor 

Washington, D.C. 20001

Internet Address URL) . http://wwwepa.gov 


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UNITED STATES ENVIRONMENTAL PROTECTION AGENCY


WASHINGTON, D.C. 20460

OFFICE OF
 Ms. Frances Beinecke AIR AND RADIATION 

President 

Natural Resources Defense Council 

40 West 20th Street 

New York, New York 10011 

Dear Ms. Beinecke: 

Thank you for your letter of November 5, 2013, urging the U.S. Environmental Protection Agency to 

finalize as soon as possible the rulemaking for "Tier 3" light-duty vehicle emissions and gasoline 

standards. The EPA is developing the Tier 3 standards to respond to the critical need to improve air 

quality and to enable a harmonized national vehicle emissions control program. The EPA shares your 

goal of reducing air pollution across the United States, and the Tier 3 standards have the potential to 

achieve significant benefits. 

This Tier 3 rule would reduce motor vehicle emissions and help state and local areas attain and maintain 

the existing health-based air quality standards in a cost-effective and timely way. The reductions in 

ozone and particulate matter would avoid premature mortality and other health impacts, including 

respiratory symptoms in children and exacerbation of asthma. A timely Tier 3 program is critical to 

addressing the impacts of motor vehicles on air quality and public health; therefore, we are working to 

finalize the Tier 3 rule as expeditiously as possible and currently intend to issue the final rule in 

February 2014. 

Again, thank you for your letter and for your continued support of the Tier 3 program. I appreciate your 

commitment to achieving clean air for all Americans, and I look forward to continuing to work together 

towards that goal.

Christopher Grundler, Director 

Office of Transportation and Air Quality 

cc: Ms. Jesse Prentice-Dunn 

Sierra Club 

50 F Street, N.W, Eight Floor 

Washington, D.C. 20001

Internet Address (URL) . http//wwwepa.gov 


Recycled/Recyclable Printed with Vegetable Oil Based Inks on 100% Postconsumer. Process Chlorine Free Recycled Paper
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UNITED STATES ENVIRONMENTAL PROTECTION AGENCY


WASHJNGTON, D.C. 20460

OFOCE OF
 Mr. Dan Becker AR AND RADIATION 

Director 

Safe Climate Campaign 

1825 Connecticut Avenue, N.W. 

Suite 330 

Washington, D.C. 20009-5708 

Thank you for your letter of November 5, 2013, urging the U.S. Environmental Protection Agency to 

finalize as soon as possible the rulemaking for "Tier 3" light-duty vehicle emissions and gasoline 

standards. The EPA is developing the Tier 3 standards to respond to the critical need to improve air 

quality and to enable a harmonized national vehicle emissions control program. The EPA shares your 

goal of reducing air pollution across the United States, and the Tier 3 standards have the potential to 

achieve significant benefits. 

This Tier 3 rule would reduce motor vehicle emissions and help state and local areas attain and maintain 

the existing health-based air quality standards in a cost-effective and timely way. The reductions in 

ozone and particulate matter would avoid premature mortality and other health impacts, including 

respiratory symptoms in children and exacerbation of asthma. A timely Tier 3 program is critical to 

addressing the impacts of motor vehicles on air quality and public health; therefore, we are working to 

finalize the Tier 3 rule as expeditiously as possible and currently intend to issue the final rule in 

February 2014. 

Again, thank you for your letter and for your continued support of the Tier 3 program. I appreciate your 

commitment to achieving clean air for all Americans, and I look forward to continuing to work together 

towards that goal.

Christopher Grundler, Director 

Office of Transportation and Air Quality 

cc: Ms. Jesse Prentice-Dunn 

Sierra Club 

50 F Street, N.W, Eight Floor 

Washington, D.C. 20001

Internet Address (URL) http.//wwwepagov


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h Grundler, Director 

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PROUNITED STATES ENVIRONMENTAL PROTECTION AGENCY


WASHINGTON, D.C. 20460

OFFICE OF
 Mr. Michael Brune AIR AND RADIATION 

Executive Director 

Sierra Club 

50 F Street, N.W., Eight Floor 

Washington, D.C. 20001 

Thank you for your letter of November 5, 2013, urging the U.S. Environmental Protection Agency to 

finalize as soon as possible the rulemaking for "Tier 3" light-duty vehicle emissions and gasoline 

standards. The EPA is developing the Tier 3 standards to respond to the critical need to improve air 

quality and to enable a harmonized national vehicle emissions control program. The EPA shares your 

goal of reducing air pollution across the United States, and the Tier 3 standards have the potential to 

achieve significant benefits. 

This Tier 3 rule would reduce motor vehicle emissions and help state and local areas attain and maintain 

the existing health-based air quality standards in a cost-effective and timely way. The reductions in 

ozone and particulate matter would avoid premature mortality and other health impacts, including 

respiratory symptoms in children and exacerbation of asthma. A timely Tier 3 program is critical to 

addressing the impacts of motor vehicles on air quality and public health; therefore, we are working to 

finalize the Tier 3 rule as expeditiously as possible and currently intend to issue the final rule in 

February 2014. 

Again, thank you for your letter and for your continued support of the Tier 3 program. I appreciate your 

commitment to achieving clean air for all Americans, and I look forward to continuing to work together 

towards that goal. 

cc: Ms. Jesse Prentice-Dunn 

Sierra Club 

50 F Street, N.W, Eight Floor 

Washington, D.C. 20001

Internet Address (URL) http//wwwepa.gov


Recycled/Recyclable . Printed with Vegetable Oil Based Inks on 1OO/o Postconsumer, Process Chlorine Free Recycled Paper 
UNITED STATES ENVIRONMENTAL PROTECTION AGENCY


WASH!NGTON, DC. 20460

OFOCE OF
 Mr. Stephen A. Smith AR AND RADIATION 

Executive Director 

Southern Alliance for Clean Energy 

P.O.Box 1842 

Knoxville, Tennessee 37901 

Thank you for your letter of November 5, 2013, urging the U.S. Environmental Protection Agency to 

finalize as soon as possible the rulemaking for "Tier 3" light-duty vehicle emissions and gasoline 

standards. The EPA is developing the Tier 3 standards to respond to the critical need to improve air 

quality and to enable a harmonized national vehicle emissions control program. The EPA shares your 

goal of reducing air pollution across the United States, and the Tier 3 standards have the potential to 

achieve significant benefits. 

This Tier 3 rule would reduce motor vehicle emissions and help state and local areas attain and maintain 

the existing health-based air quality standards in a cost-effective and timely way. The reductions in 

ozone and particulate matter would avoid premature mortality and other health impacts, including 

respiratory symptoms in children and exacerbation of asthma. A timely Tier 3 program is critical to 

addressing the impacts of motor vehicles on air quality and public health; therefore, we are working to 

finalize the Tier 3 rule as expeditiously as possible and currently intend to issue the final rule in 

February 2014.

Offic4 of Transportation and Air Quality 

cc: Ms. Jesse Prentice-Dunn 

Sierra Club 

50 F Street, N.W, Eight Floor 

Washington, D.C. 20001

Internet Address (URL) http.//vww epagov


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Grundler, Director 

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UNITED STATES ENVIRONMENTAL PROTECTION AGENCY


WASHINGTON, D.C. 20460

OFFICE OF


Ms. Kathleen Rest AIR AND RADIATION 

Executive Director 

Union of Concerned Scientists 

2 Brattle Square 

Cambridge, Massachusetts 02138-3780 

Thank you for your letter of November 5, 2013, urging the U.S. Environmental Protection Agency to 

finalize as soon as possible the rulemaking for "Tier 3" light-duty vehicle emissions and gasoline 

standards. The EPA is developing the Tier 3 standards to respond to the critical need to improve air 

quality and to enable a harmonized national vehicle emissions control program. The EPA shares your 

goal of reducing air pollution across the United States, and the Tier 3 standards have the potential to 

achieve significant benefits. 

This Tier 3 rule would reduce motor vehicle emissions and help state and local areas attain and maintain 

the existing health-based air quality standards in a cost-effective and timely way. The reductions in 

ozone and particulate matter would avoid premature mortality and other health impacts, including 

respiratory symptoms in children and exacerbation of asthma. A timely Tier 3 program is critical to 

addressing the impacts of motor vehicles on air quality and public health; therefore, we are working to 

finalize the Tier 3 rule as expeditiously as possible and currently intend to issue the final rule in 

February 2014.

Office Iof Transportation and Air Quality 

cc: Ms. Jesse Prentice-Dunn 

Sierra Club 

50 F Street, N.W, Eight Floor 

Washington, D.C. 20001

Internet Address (URL) http //www epa gov


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èr Grundler, Director

UNITED STATES ENVIRONMENTAL PROTECTION AGENCY


WASHINGTON, D.C. 20460 

PROt 

Ms. Peggy M. Shepard 

Executive Director 

We ACT for Environmental Justice 

50 F Street, N.W., Eight Floor 

Washington, D.C. 20001

OFFICE OF


AIR AND RADIATION 

Thank you for your letter of November 5, 2013, urging the U.S. Environmental Protection Agency to 

finalize as soon as possible the rulemaking for "Tier 3" light-duty vehicle emissions and gasoline 

standards. The EPA is developing the Tier 3 standards to respond to the critical need to improve air 

quality and to enable a harmonized national vehicle emissions control program. The EPA shares your 

goal of reducing air pollution across the United States, and the Tier 3 standards have the potential to 

achieve significant benefits. 

This Tier 3 rule would reduce motor vehicle emissions and help state and local areas attain and maintain 

the existing health-based air quality standards in a cost-effective and timely way. The reductions in 

ozone and particulate matter would avoid premature mortality and other health impacts, including 

respiratory symptoms in children and exacerbation of asthma. A timely Tier 3 program is critical to 

addressing the impacts of motor vehicles on air quality and public health; therefore, we are working to 

finalize the Tier 3 rule as expeditiously as possible and currently intend to issue the final rule in 

February 2014. 

Again, thank you for your letter and for your continued support of the Tier 3 program. I appreciate your 

commitment to achieving clean air for all Americans, and I look forward to continuing to work together 

towards that goal. 

cc: Ms. Jesse Prentice-Dunn 

Sierra Club 

50 F Street, N.W, Eight Floor 

Washington, D.C. 20001

Internet Address (URL) http.//wwwepa gay


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