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181   $ctxt$2rdacontent
182   $cc$2rdamedia
183   $acr$2rdacarrier
200 00$aPM hot-spot guidance $etransportation conformity guidance for quantitative hot-spot analyses in PM?.? and PM?? nonattainment and maintenance areas
210  1$a[Washington, D.C.] :$cUnited States Environmental Protection Agency, Office of Transportation and Air Quality,$d[2021]
215   $a1 online resource (5 pages)
300   $a"Guidance change bulletin."
300   $a"October 2021."
300   $a"EPA-420-B-21-038"
517   $aPM hot-spot guidance 
606   $aDiesel motor exhaust gas$xStandards
606   $aAutomobiles$xMotors$xExhaust gas$xStandards
606   $aAutomobiles$xMotors$xExhaust gas$xStandards$2fast
607   $aUnited States$2fast
615  0$aDiesel motor exhaust gas$xStandards.
615  0$aAutomobiles$xMotors$xExhaust gas$xStandards.
615  7$aAutomobiles$xMotors$xExhaust gas$xStandards.
712 02$aUnited States.$bEnvironmental Protection Agency.$bOffice of Transportation and Air Quality,
801  0$bELC
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996   $aPM hot-spot guidance$93517604
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