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181   $ctxt$2rdacontent
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200 00$aTechnical basis for the EPA's development of the significant impact thresholds for PM2.5 and ozone /$fAir Quality Assessment Division
210  1$aResearch Triangle Park, NC :$cU.S. Environmental Protection Agency, Office of Air Quality Planning and Standards, Air Quality Assessment Division,$dApril 2018.
215   $a1 online resource (2 volumes) $ccolor illustrations, maps
300   $a"April 2018."
300   $a"EPA-454/R-18-001."
300   $aSuffix in report number based on information from agency.
320   $aIncludes bibliographical references.
327   $a[V.1. Without special title] -- [V.2 Appendices].
517 3 $aTechnical basis for the Environmental Protection Agency's development of the significant impact thresholds for Particulate Matter 2.5 and ozone
606   $aAir quality$xStandards$zUnited States
606   $aAir$xPollution$xStandards$zUnited States
606   $aAir$xPollution$zUnited States$xMeasurement
606   $aAtmospheric ozone$zUnited States$xMeasurement
606   $aAtmospheric ozone$xEnvironmental aspects$zUnited States
606   $aAir$xPollution$xMeasurement$2fast
606   $aAir$xPollution$xStandards$2fast
606   $aAir quality$xStandards$2fast
606   $aAtmospheric ozone$xEnvironmental aspects$2fast
606   $aAtmospheric ozone$xMeasurement$2fast
607   $aUnited States$2fast
615  0$aAir quality$xStandards
615  0$aAir$xPollution$xStandards
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615  0$aAtmospheric ozone$xMeasurement.
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996   $aTechnical basis for the EPA's development of the significant impact thresholds for PM2.5 and ozone$93299235
997   $aUNINA