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OFFICE OF AIR AND RADATON The Honorable Benjamin L. Cardin United States Senate Washington, D.C. 20510 Dear Senator Cardin: Thank you for your letter of November 29, 2012 to President Obama, co-signed by 12 of your colleagues, urging the prompt proposal of "Tier 3" light-duty vehicle emissions and gasoline standards. The U.S. Environmental Protection Agency 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. We agree that the Tier 3 standards would have many health and economic benefits. As mentioned in your letter, 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. The Tier 3 standards would also create a comprehensive regulatory approach that provides certainty for both the auto and oil industries. Under a single harmonized national vehicle program, the Tier 3 standards under consideration would provide for coordinated implementation with the California vehicle program and the EPA and Department of Transportation's recently finalized light-duty vehicle standards to reduce carbon pollution and improve fuel economy for model years 2017 through 2025. We recognize that the Tier 3 program is critical to addressing the impacts of motor vehicles on air quality and public health; therefore we intend to propose Tier 3 standards in the Spring of 2013 and finalize these standards by the end of 2013. Again, thank you for your letter. If you have further questions, please contact me or your staff may call Patricia Haman in EPA's Office of Congressional and Intergovernmental Relations at (202) 564-2806.

Gina McCarthy Assistant Administrator

Internet Address (URL) . bttp //wwwepa gov Recycled/Recyclable Printed with Vegetable Oil Based Inks on l00% Postconsumer Process Chlorine Free Recycled PaperUNITED STATES ENVIRONMENTAL PROTECTION AGENCY WASHINGTON, DC. 20460

OFFICE OF AIR AND RADIATION
The Honorable Kirsten E. Gillibrand United States Senate Washington, D.C. 20510
Dear Senator Gillibrand: Thank you for your letter of November 29, 2012 to President Obama, co-signed by 12 of your colleagues, urging the prompt proposal of "Tier 3" light-duty vehicle emissions and gasoline standards. The U.S. Environmental Protection Agency 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. We agree that the Tier 3 standards would have many health and economic benefits. As mentioned in your letter, 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. The Tier 3 standards would also create a comprehensive regulatory approach that provides certainty for both the auto and oil industries. Under a single harmonized national vehicle program, the Tier 3 standards under consideration would provide for coordinated implementation with the California vehicle program and the EPA and Department of Transportation!s recently finalized light-duty vehicle standards to reduce carbon pollution and improve fuel economy for model years 2017 through 2025. We recognize that the Tier 3 program is critical to addressing the impacts of motor vehicles on air quality and public health; therefore we intend to propose Tier 3 standards in the Spring of 2013 and finalize these standards by the end of 2013. Again, thank you for your letter. If you have further questions, please contact me or your staff may call Patricia Haman in EPA's Office of Congressional and Intergovernmental Relations at (202) 564-2806.

Gina McCarthy Assistant Administrator

Internet Address (URL) . http //wwwepa gov Recycled/Recyclable Printed with Vegetable Oil Based Inks on 1000/0 Postconsumer, Process Chlorrne Free Recycled PaperS7. UNITED STATES ENVIRONMENTAL PROTECTION AGENCY WASHINGTON, DC. 20460

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OFFICL OF AIR AND RADIATION
The Honorable Patty Murray United States Senate Washington, D.C. 20510 Dear Senator Murray: Thank you for your letter of November 29, 2012 to President Obama, co-signed by 12 of your colleagues, urging the prompt proposal of "Tier 3" light-duty vehicle emissions and gasoline standards. The U.S. Environmental Protection Agency 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. We agree that the Tier 3 standards would have many health and economic benefits. As mentioned in your letter, 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. The Tier 3 standards would also create a comprehensive regulatory approach that provides certainty for both the auto and oil industries. Under a single harmonized national vehicle program, the Tier 3 standards under consideration would provide for coordinated implementation with the California vehicle program and the EPA and Department of Transportation's recently finalized light-duty vehicle standards to reduce carbon pollution and improve fuel economy for model years 2017 through 2025. We recognize that the Tier 3 program is critical to addressing the impacts of motor vehicles on air quality and public health; therefore we intend to propose Tier 3 standards in the Spring of 2013 and finalize these standards by the end of 2013. Again, thank you for your letter. If you have further questions, please contact me or your staff may call Patricia Haman in EPA's Office of Congressional and Intergovernmental Relations at (202) 564-2806.

Gina McCarthy Assistant Administrator

Internet Address (URL) http //www epagov Recycled/Recyclable . Printed with Vegetable Oil Based Inks on 100% Postconsumer. Process Chlorine Free Recycled Papery0 S7q.

- UNITED STATES ENVIRONMENTAL PROTECTION AGENCY WASHINGTON, D.C. 20460

OFFICE OF AIR AND RADIATION

The Honorable Richard J. Durbin United States Senate Washington, D.C. 20510 Dear Senator Durbin: Thank you for your letter of November 29, 2012 to President Obama, co-signed by 12 of your colleagues, urging the prompt proposal of "Tier 3" light-duty vehicle emissions and gasoline standards. The U.S. Environmental Protection Agency 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. We agree that the Tier 3 standards would have many health and economic benefits. As mentioned in your letter, 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. The Tier 3 standards would also create a comprehensive regulatory approach that provides certainty for both the auto and oil industries. Under a single harmonized national vehicle program, the Tier 3 standards under consideration would provide for coordinated implementation with the California vehicle program and the EPA and Department of Transportation's recently finalized light-duty vehicle standards to reduce carbon pollution and improve fuel economy for model years 2017 through 2025. We recognize that the Tier 3 program is critical to addressing the impacts of motor vehicles on air quality and public health; therefore we intend to propose Tier 3 standards in the Spring of 2013 and finalize these standards by the end of 2013. Again, thank you for your letter. If you have further questions, please contact me or your staff may call Patricia Haman in EPA's Office of Congressional and Intergovernmental Relations at (202) 564-2806.

Gina McCarthy Assistant Administrator

Internet Address (URL) . http //www epa gov Recycled/Recyclable Pnnted with Vegetable Oil Based Inks on 1000/o PostconsLjmer, Process Chlorine Free Recycled Paper\ D ST,q1.

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OEFCE OF AIR AND RADIATON
The Honorable Frank R. Lautenberg United States Senate Washington, D.C. 20510 Dear Senator Lautenberg: Thank you for your letter of November 29, 2012 to President Obama, co-signed by 12 of your colleagues, urging the prompt proposal of "Tier 3" light-duty vehicle emissions and gasoline standards. The U.S. Environmental Protection Agency 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. We agree that the Tier 3 standards would have many health and economic benefits. As mentioned in your letter, 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. The Tier 3 standards would also create a comprehensive regulatory approach that provides certainty for both the auto and oil industries. Under a single harmonized national vehicle program, the Tier 3 standards under consideration would provide for coordinated implementation with the California vehicle program and the EPA and Department of Transportation's recently finalized light-duty vehicle standards to reduce carbon pollution and improve fuel economy for model years 2017 through 2025. We recognize that the Tier 3 program is critical to addressing the impacts of motor vehicles on air quality and public health; therefore we intend to propose Tier 3 standards in the Spring of 2013 and finalize these standards by the end of 2013. Again, thank you for your letter. If you have further questions, please contact me or your staff may call Patricia Haman in EPA's Office of Congressional and Intergovernmental Relations at (202) 564-2806.

Gina McCarthy Assistant Administrator

Internet Address (URL) http //www epagov Recycled/Recyclable . Prrnted with Vegetable Oil Based Inks on 100% Postconsumer, Process ChlorLne Free Recycled Papery0

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OFFICE OF AIR AND RADIATION The Honorable Jeff Merkley United States Senate Washington, D.C. 20510 Dear Senator Merkley: Thank you for your letter of November 29, 2012 to President Obama, co-signed by 12 of your colleagues, urging the prompt proposal of "Tier 3" light-duty vehicle emissions and gasoline standards. The U.S. Environmental Protection Agency 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. We agree that the Tier 3 standards would have many health and economic benefits. As mentioned in your letter, 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. The Tier 3 standards would also create a comprehensive regulatory approach that provides certainty for both the auto and oil industries. Under a single harmonized national vehicle program, the Tier 3 standards under consideration would provide for coordinated implementation with the California vehicle program and the EPA and Department of Transportation's recently finalized light-duty vehicle standards to reduce carbon pollution and improve fuel economy for model years 2017 through 2025. We recognize that the Tier 3 program is critical to addressing the impacts of motor vehicles on air quality and public health; therefore we intend to propose Tier 3 standards in the Spring of 2013 and finalize these standards by the end of 2013. Again, thank you for your letter. If you have further questions, please contact me or your staff may call Patricia Haman in EPA's Office of Congressional and Intergovernmental Relations at (202) 564-2806.

Gina McCarthy Assistant Administrator

Internet Address (URL) . http//wwepa gov RecycledlRecyclable Printed with Vegetable Oil Based Inks on 100% Postconsumer, Process Chlorine Free Recycled Paper\1 Sr.q

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OFFICE OF AIR AND RADIATION

The Honorable Sheldon Whitehouse United States Senate Washington, D.C. 20510 Dear Senator Whitehouse: Thank you for your letter of November 29, 2012 to President Obama, co-signed by 12 of your colleagues, urging the prompt proposal of "Tier 3" light-duty vehicle emissions and gasoline standards. The U.S. Environmental Protection Agency 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. We agree that the Tier 3 standards would have many health and economic benefits. As mentioned in your letter, 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. The Tier 3 standards would also create a comprehensive regulatory approach that provides certainty for both the auto and oil industries. Under a single harmonized national vehicle program, the Tier 3 standards under consideration would provide for coordinated implementation with the California vehicle program and the EPA and Department of Transportation's recently finalized light-duty vehicle standards to reduce carbon pollution and improve fuel economy for model years 2017 through 2025. We recognize that the Tier 3 program is critical to addressing the impacts of motor vehicles on air quality and public health; therefore we intend to propose Tier 3 standards in the Spring of 2013 and finalize these standards by the end of 2013. Again, thank you for your letter. If you have further questions, please contact me or your staff may call Patricia Haman in EPA's Office of Congressional and Intergovernmental Relations at (202) 564-2806.

Gina McCarthy Assistant Administrator

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OFFICE OF AIR AND RADIATION

The Honorable Robert Menendez United States Senate Washington, D.C. 20510 Dear Senator Menendez: Thank you for your letter of November 29, 2012 to President Obama, co-signed by 12 of your colleagues, urging the prompt proposal of "Tier 3" light-duty vehicle emissions and gasoline standards. The U.S. Environmental Protection Agency 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. We agree that the Tier 3 standards would have many health and economic benefits. As mentioned in your letter, 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. The Tier 3 standards would also create a comprehensive regulatory approach that provides certainty for both the auto and oil industries. Under a single harmonized national vehicle program, the Tier 3 standards under consideration would provide for coordinated implementation with the California vehicle program and the EPA and Department of Transportation's recently finalized light-duty vehicle standards to reduce carbon pollution and improve fuel economy for model years 2017 through 2025. We recognize that the Tier 3 program is critical to addressing the impacts of motor vehicles on air quality and public health; therefore we intend to propose Tier 3 standards in the Spring of 2013 and finalize these standards by the end of 2013. Again, thank you for your letter. If you have further questions, please contact me or your staff may call Patricia Haman in EPA's Office of Congressional and Intergovernmental Relations at (202) 564-2806.

Gina McCarthy Assistant Administrator

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OPFICL OF AIR AND RADIATON

The Honorable Charles E. Schumer United States Senate Washington, D.C. 20510
Dear Senator Schumer: Thank you for your letter of November 29, 2012 to President Obama, co-signed by 12 of your colleagues, urging the prompt proposal of "Tier 3" light-duty vehicle emissions and gasoline standards. The U.S. Environmental Protection Agency 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. We agree that the Tier 3 standards would have many health and economic benefits. As mentioned in your letter, 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. The Tier 3 standards would also create a comprehensive regulatory approach that provides certainty for both the auto and oil industries. Under a single harmonized national vehicle program, the Tier 3 standards under consideration would provide for coordinated implementation with the California vehicle program and the EPA and Department of Transportation's recently finalized light-duty vehicle standards to reduce carbon pollution and improve fuel economy for model years 2017 through 2025. We recognize that the Tier 3 program is critical to addressing the impacts of motor vehicles on air quality and public health; therefore we intend to propose Tier 3 standards in the Spring of 2013 and finalize these standards by the end of 2013. Again, thank you for your letter. If you have further questions, please contact me or your staff may call Patricia Haman in EPA's Office of Congressional and Intergovernmental Relations at (202) 564-2806.

Gina McCarthy Assistant Administrator

Internet Address (URL) http //www epagov Recycled/Recyclable Printed with Vegetable Oil Based Inks on 1000/o Postconsumer, Process Chlorine Free Recycled PaperUNITED STATES ENVIRONMENTAL PROTECTION AGENCY WASHINGTON, DC. 20460

OFFICE OF AIR AND RADIATION

The Honorable Richard Blumenthal United States Senate Washington, D.C. 20510
Dear Senator Blumenthal: Thank you for your letter of November 29, 2012 to President Obama, co-signed by 12 of your colleagues, urging the prompt proposal of "Tier 3" light-duty vehicle emissions and gasoline standards. The U.S. Environmental Protection Agency 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. We agree that the Tier 3 standards would have many health and economic benefits. As mentioned in your letter, 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. The Tier 3 standards would also create a comprehensive regulatory approach that provides certainty for both the auto and oil industries. Under a single harmonized national vehicle program, the Tier 3 standards under consideration would provide for coordinated implementation with the California vehicle program and the EPA and Department of Transportation's recently finalized light-duty vehicle standards to reduce carbon pollution and improve fuel economy for model years 2017 through 2025. We recognize that the Tier 3 program is critical to addressing the impacts of motor vehicles on air quality and public health; therefore we intend to propose Tier 3 standards in the Spring of 2013 and finalize these standards by the end of 2013. Again, thank you for your letter. If you have further questions, please contact me or your staff may call Patricia Haman in EPA's Office of Congressional and Intergovernmental Relations at (202) 564-2806.

Gina McCarthy Assistant Administrator

Internet Address (URL) . http //www epa gov Recycled/Recyclabie . Printed with Vegetable Oil Based Inks on 1000/o Postconsumer, Process Chlorine Free Recycled PaperUNITED STATES ENVIRONMENTAL PROTECTION AGENCY WASHINGTON, D.C. 20460

OFFICE OF AIR AND RADIATION

The Honorable Sherrod Brown United States Senate Washington, D.C. 20510
Dear Senator Brown: Thank you for your letter of November 29, 2012 to President Obama, co-signed by 12 of your colleagues, urging the prompt proposal of "Tier 3" light-duty vehicle emissions and gasoline standards. The U.S. Environmental Protection Agency 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. We agree that the Tier 3 standards would have many health and economic benefits. As mentioned in your letter, 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. The Tier 3 standards would also create a comprehensive regulatory approach that provides certainty for both the auto and oil industries. Under a single harmonized national vehicle program, the Tier 3 standards under consideration would provide for coordinated implementation with the California vehicle program and the EPA and Department of Transportation's recently finalized light-duty vehicle standards to reduce carbon pollution and improve fuel economy for model years 2017 through 2025. We recognize that the Tier 3 program is critical to addressing the impacts of motor vehicles on air quality and public health; therefore we intend to propose Tier 3 standards in the Spring of 2013 and finalize these standards by the end of 2013. Again, thank you for your letter. If you have further questions, please contact me or your staff may call Patricia Haman in EPA's Office of Congressional and Intergovernmental Relations at (202) 564-2806.

Gina McCarthy Assistant Administrator

Internet Address (URL) . http//wwwepa gov Recycled/Recyclable Printed with Vegetable Oil Based Inks on 100% Postconsumer, Process Chlorine Free Recycled Paper