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3. EPA U.S. Integrated science assessment for oxides of nitrogen (final report). EPA Report. EPA/600/R-15/068. Research Triangle Park, NC: U.S. Environmental Protection Agency, National Center for Environmental Assessment, 2016.
4. U.S. EPA. Integrated science assessment for sulfur oxides: Health criteria. EPA Report. EPA/600/R-17/451. Research Triangle Park, NC: U.S. Environmental Protection Agency, Office of Research and Development, National Center for Environmental Assessment-RTP, 2017.
5. EPA U.S. Preamble to the Integrated Science Assessments. EPA Report. EPA/600/R-15/067. Research Triangle Park, NC: National Center for EnvironmentalAssessment, Office of Research and Development, 2015.