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EPA welcomes your comments.  We strive to respond  to every comment with an answer or an appropriate referral as quickly as possible. 

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Questions concerning information in the Green Book and related EPA policy should be directed to the appropriate Regional Office. EPA Headquarters should be contacted only when the Regional Office is unable to answer a question.

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Green Book

  • 8-Hour Ozone (2015)
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Last updated on April 22, 2025
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