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OFFICE OF AIR AND RADIATION Mr. John Judge 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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OFF!CE OF AR AND RADIAT!ON Mr. David Foster 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

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OFFICE f AIR AND RADIATION Mr. Kieran Suckling 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

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OFFICE OF AIR AND RADIATION Mr. Frank O'Donnell 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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OFFICE OF AIR AND RADIATION Mr. Robert Wendelgass 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

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OFFICE OF AIR AND RADIATION 

### Ms. Kathleen Rogers 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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OFFICE OF AIR AND RADIATION Ms. Margie Alt 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

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OFFICE OF AIR ND RADIATION Mr. Fred Krupp 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

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OFFICE OF AIR AND RADIATION Mr. Howard Learner 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 Paperstoprrundler, Director Office of Transportation and Air Quality UNITED STATES ENVIRONMENTAL PROTECTION AGENCY

WASHINGTON, D.C. 20460 1°

OFFFCE OF AR AND RADIAT!ON Mr. Gene Karpinski 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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OFFCE OF AjR AND RADrATON Ms. Dominique Browning 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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OFFICE OF AIR AND RADIATION Ms. Theresa Pierno 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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OFFICE OF AIR AND RADIATION Ms. Frances Beinecke 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

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OFOCE OF AR AND RADIATION Mr. Dan Becker 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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OFFICE OF AIR AND RADIATION Mr. Michael Brune 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 PaperUNITED STATES ENVIRONMENTAL PROTECTION AGENCY WASH!NGTON, DC. 20460

OFOCE OF AR AND RADIATION Mr. Stephen A. Smith 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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OFFICE OF AIR AND RADIATION Ms. Kathleen Rest 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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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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